JP2005082703A - Material for organic electroluminescent device and organic electroluminescent device using the same - Google Patents
Material for organic electroluminescent device and organic electroluminescent device using the same Download PDFInfo
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- JP2005082703A JP2005082703A JP2003316325A JP2003316325A JP2005082703A JP 2005082703 A JP2005082703 A JP 2005082703A JP 2003316325 A JP2003316325 A JP 2003316325A JP 2003316325 A JP2003316325 A JP 2003316325A JP 2005082703 A JP2005082703 A JP 2005082703A
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- 239000000463 material Substances 0.000 title claims abstract description 95
- 150000001875 compounds Chemical class 0.000 claims abstract description 84
- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 16
- 125000003118 aryl group Chemical group 0.000 claims abstract description 14
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 150000002391 heterocyclic compounds Chemical class 0.000 claims abstract description 3
- 238000002347 injection Methods 0.000 claims description 66
- 239000007924 injection Substances 0.000 claims description 66
- 238000005401 electroluminescence Methods 0.000 claims description 31
- 230000000903 blocking effect Effects 0.000 claims description 21
- 239000010409 thin film Substances 0.000 claims description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 150000002894 organic compounds Chemical class 0.000 claims description 9
- 125000001424 substituent group Chemical group 0.000 claims description 9
- 125000003277 amino group Chemical group 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 125000005842 heteroatom Chemical group 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 125000004414 alkyl thio group Chemical group 0.000 claims description 6
- 125000005110 aryl thio group Chemical group 0.000 claims description 6
- 125000004104 aryloxy group Chemical group 0.000 claims description 6
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 6
- 239000003446 ligand Substances 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 5
- 125000002837 carbocyclic group Chemical group 0.000 claims description 5
- 229910052697 platinum Inorganic materials 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 125000005843 halogen group Chemical group 0.000 claims description 4
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 3
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 125000002252 acyl group Chemical group 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229940126062 Compound A Drugs 0.000 abstract 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 131
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- 229910052782 aluminium Inorganic materials 0.000 description 23
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- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 17
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- 239000010408 film Substances 0.000 description 15
- 230000005525 hole transport Effects 0.000 description 11
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 10
- 239000000956 alloy Substances 0.000 description 9
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- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 230000005281 excited state Effects 0.000 description 8
- 229910052733 gallium Inorganic materials 0.000 description 8
- 229910052749 magnesium Inorganic materials 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 8
- 125000003367 polycyclic group Chemical group 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 229910052709 silver Inorganic materials 0.000 description 8
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- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 6
- 125000002950 monocyclic group Chemical group 0.000 description 6
- 125000004433 nitrogen atom Chemical group N* 0.000 description 6
- 239000012044 organic layer Substances 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 238000001771 vacuum deposition Methods 0.000 description 6
- 238000000151 deposition Methods 0.000 description 5
- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical group C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 5
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 5
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 5
- VKZIZIKRZSYNOK-UHFFFAOYSA-N C1=CC=C2C=CC(C)(C(O)=O)NC2=C1O Chemical compound C1=CC=C2C=CC(C)(C(O)=O)NC2=C1O VKZIZIKRZSYNOK-UHFFFAOYSA-N 0.000 description 4
- ZCQWOFVYLHDMMC-UHFFFAOYSA-N Oxazole Chemical compound C1=COC=N1 ZCQWOFVYLHDMMC-UHFFFAOYSA-N 0.000 description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 239000007983 Tris buffer Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-M phenolate Chemical compound [O-]C1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-M 0.000 description 4
- 229940031826 phenolate Drugs 0.000 description 4
- 150000003852 triazoles Chemical group 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- STTGYIUESPWXOW-UHFFFAOYSA-N 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline Chemical compound C=12C=CC3=C(C=4C=CC=CC=4)C=C(C)N=C3C2=NC(C)=CC=1C1=CC=CC=C1 STTGYIUESPWXOW-UHFFFAOYSA-N 0.000 description 3
- HEZOTHICSIMEDA-UHFFFAOYSA-N C1(=CC=CC=C1)C1=CC=C(C=C1)O.CC1(NC2=C(C=CC=C2C=C1)O)C(=O)O.CC1(NC2=C(C=CC=C2C=C1)O)C(=O)O Chemical compound C1(=CC=CC=C1)C1=CC=C(C=C1)O.CC1(NC2=C(C=CC=C2C=C1)O)C(=O)O.CC1(NC2=C(C=CC=C2C=C1)O)C(=O)O HEZOTHICSIMEDA-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical group C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical group C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 239000004305 biphenyl Substances 0.000 description 3
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000000434 field desorption mass spectrometry Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical compound [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 3
- LBFXFIPIIMAZPK-UHFFFAOYSA-N n-[4-[4-(n-phenanthren-9-ylanilino)phenyl]phenyl]-n-phenylphenanthren-9-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C2=CC=CC=C2C=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C3=CC=CC=C3C=2)C=C1 LBFXFIPIIMAZPK-UHFFFAOYSA-N 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 125000000168 pyrrolyl group Chemical group 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 238000004528 spin coating Methods 0.000 description 3
- 238000000859 sublimation Methods 0.000 description 3
- 230000008022 sublimation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 0 *C1=Nc2cc(N=C(*)*3)c3cc2*1 Chemical compound *C1=Nc2cc(N=C(*)*3)c3cc2*1 0.000 description 2
- MEKOFIRRDATTAG-UHFFFAOYSA-N 2,2,5,8-tetramethyl-3,4-dihydrochromen-6-ol Chemical compound C1CC(C)(C)OC2=C1C(C)=C(O)C=C2C MEKOFIRRDATTAG-UHFFFAOYSA-N 0.000 description 2
- MUNFOTHAFHGRIM-UHFFFAOYSA-N 2,5-dinaphthalen-1-yl-1,3,4-oxadiazole Chemical compound C1=CC=C2C(C3=NN=C(O3)C=3C4=CC=CC=C4C=CC=3)=CC=CC2=C1 MUNFOTHAFHGRIM-UHFFFAOYSA-N 0.000 description 2
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 2
- ZZLCFHIKESPLTH-UHFFFAOYSA-N 4-Methylbiphenyl Chemical group C1=CC(C)=CC=C1C1=CC=CC=C1 ZZLCFHIKESPLTH-UHFFFAOYSA-N 0.000 description 2
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
- KLSJWNVTNUYHDU-UHFFFAOYSA-N Amitrole Chemical group NC1=NC=NN1 KLSJWNVTNUYHDU-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical group C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 125000004947 alkyl aryl amino group Chemical group 0.000 description 2
- 125000002490 anilino group Chemical group [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 2
- XJDFBLQCLSBCGQ-UHFFFAOYSA-N anthracene-1-carbaldehyde Chemical compound C1=CC=C2C=C3C(C=O)=CC=CC3=CC2=C1 XJDFBLQCLSBCGQ-UHFFFAOYSA-N 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- 125000001769 aryl amino group Chemical group 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000007850 fluorescent dye Substances 0.000 description 2
- 125000002485 formyl group Chemical group [H]C(*)=O 0.000 description 2
- 125000003838 furazanyl group Chemical group 0.000 description 2
- 125000002883 imidazolyl group Chemical group 0.000 description 2
- 125000001041 indolyl group Chemical group 0.000 description 2
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- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 2
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- 125000002911 monocyclic heterocycle group Chemical group 0.000 description 2
- LKKPNUDVOYAOBB-UHFFFAOYSA-N naphthalocyanine Chemical class N1C(N=C2C3=CC4=CC=CC=C4C=C3C(N=C3C4=CC5=CC=CC=C5C=C4C(=N4)N3)=N2)=C(C=C2C(C=CC=C2)=C2)C2=C1N=C1C2=CC3=CC=CC=C3C=C2C4=N1 LKKPNUDVOYAOBB-UHFFFAOYSA-N 0.000 description 2
- 125000001624 naphthyl group Chemical group 0.000 description 2
- 125000001715 oxadiazolyl group Chemical group 0.000 description 2
- 125000002971 oxazolyl group Chemical group 0.000 description 2
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 2
- 229920000548 poly(silane) polymer Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920000137 polyphosphoric acid Polymers 0.000 description 2
- 229920000128 polypyrrole Polymers 0.000 description 2
- 229920000123 polythiophene Polymers 0.000 description 2
- 125000003373 pyrazinyl group Chemical group 0.000 description 2
- 125000003226 pyrazolyl group Chemical group 0.000 description 2
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- 239000002356 single layer Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- RMVRSNDYEFQCLF-UHFFFAOYSA-N thiophenol Substances SC1=CC=CC=C1 RMVRSNDYEFQCLF-UHFFFAOYSA-N 0.000 description 2
- 125000005580 triphenylene group Chemical group 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- VATMAIIQZAWLFY-UHFFFAOYSA-N (1,9,10,11,12-pentaacetyloxytriphenylen-2-yl) acetate Chemical group CC(=O)OC1=C(OC(C)=O)C(OC(C)=O)=C2C3=C(OC(C)=O)C(OC(=O)C)=CC=C3C3=CC=CC=C3C2=C1OC(C)=O VATMAIIQZAWLFY-UHFFFAOYSA-N 0.000 description 1
- UWRZIZXBOLBCON-VOTSOKGWSA-N (e)-2-phenylethenamine Chemical compound N\C=C\C1=CC=CC=C1 UWRZIZXBOLBCON-VOTSOKGWSA-N 0.000 description 1
- FXQKTVQNFVFWAA-UHFFFAOYSA-N 1,2,3,4,5,6-hexahexoxytriphenylene Chemical group CCCCCCOC1=C(OCCCCCC)C(OCCCCCC)=C2C3=C(OCCCCCC)C(OCCCCCC)=CC=C3C3=CC=CC=C3C2=C1OCCCCCC FXQKTVQNFVFWAA-UHFFFAOYSA-N 0.000 description 1
- GXDOGWCPOURDSL-UHFFFAOYSA-N 1,2,3,4,5,6-hexamethoxytriphenylene Chemical group COC1=C(OC)C(OC)=C2C3=C(OC)C(OC)=CC=C3C3=CC=CC=C3C2=C1OC GXDOGWCPOURDSL-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- SJADXKHSFIMCRC-UHFFFAOYSA-N 1-n,1-n,4-n,4-n-tetrakis(4-methylphenyl)benzene-1,4-diamine Chemical compound C1=CC(C)=CC=C1N(C=1C=CC(=CC=1)N(C=1C=CC(C)=CC=1)C=1C=CC(C)=CC=1)C1=CC=C(C)C=C1 SJADXKHSFIMCRC-UHFFFAOYSA-N 0.000 description 1
- 125000001637 1-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C(*)=C([H])C([H])=C([H])C2=C1[H] 0.000 description 1
- 125000005978 1-naphthyloxy group Chemical group 0.000 description 1
- YTQQIHUQLOZOJI-UHFFFAOYSA-N 2,3-dihydro-1,2-thiazole Chemical compound C1NSC=C1 YTQQIHUQLOZOJI-UHFFFAOYSA-N 0.000 description 1
- SNTWKPAKVQFCCF-UHFFFAOYSA-N 2,3-dihydro-1h-triazole Chemical compound N1NC=CN1 SNTWKPAKVQFCCF-UHFFFAOYSA-N 0.000 description 1
- PQYIVUDIIIJJDM-UHFFFAOYSA-N 2,5-dinaphthalen-1-yl-1,3,4-thiadiazole Chemical compound C1=CC=C2C(C3=NN=C(S3)C=3C4=CC=CC=C4C=CC=3)=CC=CC2=C1 PQYIVUDIIIJJDM-UHFFFAOYSA-N 0.000 description 1
- TUSYJBWUTKJDDG-UHFFFAOYSA-N 2-(n-phenylanilino)benzaldehyde Chemical compound O=CC1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 TUSYJBWUTKJDDG-UHFFFAOYSA-N 0.000 description 1
- ZFXZGNSFTILOND-UHFFFAOYSA-L 2-carboxyquinolin-8-olate;manganese(2+) Chemical compound [Mn+2].C1=C(C([O-])=O)N=C2C(O)=CC=CC2=C1.C1=C(C([O-])=O)N=C2C(O)=CC=CC2=C1 ZFXZGNSFTILOND-UHFFFAOYSA-L 0.000 description 1
- CHZCERSEMVWNHL-UHFFFAOYSA-N 2-hydroxybenzonitrile Chemical compound OC1=CC=CC=C1C#N CHZCERSEMVWNHL-UHFFFAOYSA-N 0.000 description 1
- 125000005979 2-naphthyloxy group Chemical group 0.000 description 1
- BCHZICNRHXRCHY-UHFFFAOYSA-N 2h-oxazine Chemical group N1OC=CC=C1 BCHZICNRHXRCHY-UHFFFAOYSA-N 0.000 description 1
- CAAMSDWKXXPUJR-UHFFFAOYSA-N 3,5-dihydro-4H-imidazol-4-one Chemical compound O=C1CNC=N1 CAAMSDWKXXPUJR-UHFFFAOYSA-N 0.000 description 1
- ZVFQEOPUXVPSLB-UHFFFAOYSA-N 3-(4-tert-butylphenyl)-4-phenyl-5-(4-phenylphenyl)-1,2,4-triazole Chemical compound C1=CC(C(C)(C)C)=CC=C1C(N1C=2C=CC=CC=2)=NN=C1C1=CC=C(C=2C=CC=CC=2)C=C1 ZVFQEOPUXVPSLB-UHFFFAOYSA-N 0.000 description 1
- RIERSGULWXEJKL-UHFFFAOYSA-N 3-hydroxy-2-methylbenzoic acid Chemical compound CC1=C(O)C=CC=C1C(O)=O RIERSGULWXEJKL-UHFFFAOYSA-N 0.000 description 1
- OGGKVJMNFFSDEV-UHFFFAOYSA-N 3-methyl-n-[4-[4-(n-(3-methylphenyl)anilino)phenyl]phenyl]-n-phenylaniline Chemical compound CC1=CC=CC(N(C=2C=CC=CC=2)C=2C=CC(=CC=2)C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C=C(C)C=CC=2)=C1 OGGKVJMNFFSDEV-UHFFFAOYSA-N 0.000 description 1
- UAPNUNDZDVNTDQ-UHFFFAOYSA-N 4,5-diphenyl-1,2,3-triazole Chemical compound C1=CC=CC=C1C1=NNN=C1C1=CC=CC=C1 UAPNUNDZDVNTDQ-UHFFFAOYSA-N 0.000 description 1
- YOPJQOLALJLPBS-UHFFFAOYSA-N 4,5-diphenyloxadiazole Chemical compound C1=CC=CC=C1C1=C(C=2C=CC=CC=2)ON=N1 YOPJQOLALJLPBS-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
Description
本発明は平面光源や表示に使用される有機燐光発光素子用発光材料および高輝度・高効率の発光素子に関するものである。 The present invention relates to a light-emitting material for organic phosphorescent light-emitting elements and a light-emitting element with high luminance and high efficiency used for flat light sources and displays.
有機物質を使用した有機エレクトロルミネッセンス（ＥＬ）素子は、固体発光型の安価な大面積フルカラー表示素子としての用途が有望視され、多くの開発が行われている。一般に有機ＥＬ素子は、発光層および該層をはさんだ一対の対向電極から構成されている。発光は、両電極間に電界が印加されると、陰極側から電子が注入され、陽極側から正孔が注入され、電子が発光層において正孔と再結合し、エネルギー準位が伝導帯から価電子帯に戻る際にエネルギーを光として放出する現象である。 An organic electroluminescence (EL) element using an organic substance is expected to be used as an inexpensive large-area full-color display element of a solid light emitting type and has been developed in many ways. In general, an organic EL element is composed of a light emitting layer and a pair of counter electrodes sandwiching the layer. In light emission, when an electric field is applied between both electrodes, electrons are injected from the cathode side, holes are injected from the anode side, the electrons recombine with holes in the light emitting layer, and the energy level starts from the conduction band. It is a phenomenon in which energy is released as light when returning to the valence band.
従来の有機ＥＬ素子は、無機ＥＬ素子に比べて駆動電圧が高く、発光輝度や発光効率も低かった。また、特性劣化も著しく実用化には至っていなかった。
近年、１０Ｖ以下の低電圧で発光する高い蛍光量子効率を持った有機化合物を含有した薄膜を積層した有機ＥＬ素子が報告され、関心を集めている（非特許文献１参照）。この方法は、金属キレート錯体を発光層、アミン系化合物を正孔注入層に使用して、高輝度の緑色発光を得ており、６〜７Ｖの直流電圧で輝度は数１０００ｃｄ／ｍ2、最大発光効率は１．５ｌｍ／Ｗを達成して、実用領域に近い性能を持っている（非特許文献１参照）。
Conventional organic EL elements have a higher driving voltage and lower light emission luminance and light emission efficiency than inorganic EL elements. Further, the characteristic deterioration has been remarkably not put into practical use.
In recent years, organic EL elements in which thin films containing organic compounds having high fluorescence quantum efficiency that emit light at a low voltage of 10 V or less have been reported and attracted interest (see Non-Patent Document 1). This method uses a metal chelate complex as a light emitting layer and an amine compound as a hole injection layer to obtain a high luminance green light emission. The luminance is several thousand cd / m 2 at a direct current voltage of 6 to 7 V, maximum. The luminous efficiency is 1.5 lm / W, and the performance is close to the practical range (see Non-Patent Document 1).
さらには、従来の一重項励起状態を利用した有機ＥＬ素子に比べ、効率が大幅に改善された三重項励起状態からの発光を利用した有機ＥＬ素子（以下、有機燐光発光素子と略す）が報告され、注目を集めている（非特許文献２、３参照）。 Furthermore, an organic EL element using light emission from a triplet excited state (hereinafter, abbreviated as an organic phosphorescent light emitting element), which has greatly improved efficiency, compared to a conventional organic EL element using a singlet excited state, has been reported. It has attracted attention (see Non-Patent Documents 2 and 3).
これまでの有機燐光発光素子の多くは下記化合物（以下、ＣＢＰと省略する）に示されるようなカルバゾール骨格を有する化合物を含んでいる。また、これらの化合物は非常に結晶性が高く、安定した膜を得ることが困難である。よって、これらの材料を使った有機燐光発光素子は、寿命が短いといった問題を抱えている。
ＣＢＰ
Many of the organic phosphorescent light emitting devices so far contain a compound having a carbazole skeleton as shown in the following compound (hereinafter abbreviated as CBP). In addition, these compounds have very high crystallinity and it is difficult to obtain a stable film. Therefore, organic phosphorescent light emitting devices using these materials have a problem that their lifetime is short.
CBP
２個の複素環を同時に有する縮合芳香環であるベンゾビスアゾール誘導体を有機ＥＬ素子へ応用した例はすでに知られている（特許文献１参照）。しかし、蛍光発光を利用した有機ＥＬ素子についてのみ記述がなされている。また、最近、アゾール環、特に酸素、硫黄原子を構成要素として含むアゾール環を有機燐光発光素子へ応用した例も報告がある（特許文献２〜５参照）。しかし、ベンゾビスアゾール環が構成要素として特に優れているとの記述は見られない。
本発明の目的は、高い発光輝度、発光効率を持ち、繰り返し使用時での安定性、特に耐熱性に優れた有機エレクトロルミネッセンス素子用材料およびそれを用いた有機エレクトロルミネッセンス素子を提供することである。 An object of the present invention is to provide a material for an organic electroluminescence device having high light emission luminance and light emission efficiency, and excellent stability in repeated use, particularly heat resistance, and an organic electroluminescence device using the same. .
本発明は、同一または異なる２個以上の含窒素環が、直接または他の炭素環もしくは複素環を介して縮合した縮合複素環化合物（Ａ）、および
燐光発光材料（Ｂ）を含んでなる有機エレクトロルミネッセンス素子用材料に関する。
The present invention relates to an organic compound comprising a condensed heterocyclic compound (A) in which two or more identical or different nitrogen-containing rings are condensed directly or via another carbocyclic or heterocyclic ring, and a phosphorescent material (B). The present invention relates to a material for an electroluminescence element.
また、本発明は、化合物（Ａ）の含窒素環の数が２もしくは３であり、すべての含窒素環が、５員環であり、かつ、窒素を含む２個以上のヘテロ原子を含むものであり、かつ、他の炭素環もしくは複素環の炭素原子のみを共有して縮合したものである上記有機エレクトロルミネッセンス素子用材料に関する。 In the present invention, the number of nitrogen-containing rings in the compound (A) is 2 or 3, all nitrogen-containing rings are 5-membered rings, and contain two or more heteroatoms containing nitrogen. In addition, the present invention relates to the material for an organic electroluminescence device, wherein only the carbon atoms of other carbocycles or heterocycles are shared and condensed.
また本発明は、化合物（Ａ）が、下記一般式［１］または［２］で示される化合物である上記有機エレクトロルミネッセンス素子用材料に関する。
一般式［１］
Moreover, this invention relates to the said material for organic electroluminescent elements whose compound (A) is a compound shown by the following general formula [1] or [2].
General formula [1]
一般式［２］ General formula [2]
［式中、Ｘ1、Ｘ2は、それぞれ独立に、Ｏ、Ｓ、Ｎ−Ｒ3であり、
Ｒ1〜Ｒ3はそれぞれ独立に、置換もしくは未置換のアルキル基、置換もしくは未置換のシクロアルキル基、置換もしくは未置換のアリール基または複素環基である。前記Ｒ1〜Ｒ3および中央の炭素環の非縮合部分は、それぞれ独立に、ハロゲン原子、シアノ基、ニトロ基、置換もしくは未置換のアルキル基、置換もしくは未置換のアルコキシ基、置換もしくは未置換のアリールオキシ基、置換もしくは未置換のアルキルチオ基、置換もしくは未置換のアリールチオ基、置換もしくは未置換のアミノ基、置換もしくは未置換のアシル基、置換もしくは未置換のアリール基、または複素環基で置換されていても良く、置換基同士で一体となって環を形成していても良い。］
また、本発明は、Ｒ1およびＲ2が、置換もしくは未置換のアリール基である上記有機エレクトロルミネッセンス素子用材料に関する。
[Wherein, X 1 and X 2 are each independently O, S, or N—R 3 ;
R 1 to R 3 are each independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a heterocyclic group. R 1 to R 3 and the non-condensed part of the central carbocycle are each independently a halogen atom, cyano group, nitro group, substituted or unsubstituted alkyl group, substituted or unsubstituted alkoxy group, substituted or unsubstituted An aryloxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted amino group, a substituted or unsubstituted acyl group, a substituted or unsubstituted aryl group, or a heterocyclic group It may be substituted, and the substituents may be combined to form a ring. ]
The present invention also relates to the material for an organic electroluminescent element, wherein R 1 and R 2 are substituted or unsubstituted aryl groups.
また、本発明は、燐光発光材料（Ｂ）が、有機化合物もしくは有機残基の配位子からなるイリジウムもしくは白金錯体を含んでなる上記有機エレクトロルミネッセンス素子用材料に関する。 The present invention also relates to the material for an organic electroluminescent element, wherein the phosphorescent material (B) comprises an iridium or platinum complex composed of an organic compound or a ligand of an organic residue.
また、本発明は、一対の電極間に発光層または発光層を含む複数層の有機化合物薄膜を形成してなる有機エレクトロルミネッセンス素子において、前記層のいずれかが、上記有機エレクトロルミネッセンス素子用材料を含有する有機エレクトロルミネッセンス素子に関する。 Moreover, the present invention provides an organic electroluminescence device comprising a light emitting layer or a plurality of organic compound thin films including a light emitting layer between a pair of electrodes, wherein any one of the layers comprises the material for an organic electroluminescent device. It is related with the organic electroluminescent element to contain.
また、本発明は、一対の電極間に発光層または発光層を含む複数層の有機化合物薄膜を形成してなる有機エレクトロルミネッセンス素子において、発光層が上記有機エレクトロルミネッセンス素子用材料を含有する有機エレクトロルミネッセンス素子に関する。 In addition, the present invention provides an organic electroluminescence device in which a light emitting layer or a plurality of organic compound thin films including a light emitting layer is formed between a pair of electrodes, wherein the light emitting layer contains the organic electroluminescent device material. The present invention relates to a luminescence element.
また、本発明は、さらに、陰極と発光層との間に電子注入層を形成することを特徴とする上記有機エレクトロルミネッセンス素子に関する。 The present invention further relates to the organic electroluminescence element, wherein an electron injection layer is formed between the cathode and the light emitting layer.
また、本発明は、さらに、電子注入層と発光層との間に正孔ブロッキング層を形成することを特徴とする上記有機有機エレクトロルミネッセンス素子に関する。 The present invention further relates to the organic organic electroluminescence element, wherein a hole blocking layer is formed between the electron injection layer and the light emitting layer.
また、本発明は、さらに、陽極と発光層との間に正孔注入層を形成することを特徴とする上記有機エレクトロルミネッセンス素子に関する。 The present invention further relates to the organic electroluminescence element, wherein a hole injection layer is formed between the anode and the light emitting layer.
本発明の有機エレクトロルミネッセンス素子用材料は、特に安定性、耐熱性に優れ、それを使用した有機エレクトロルミネッセンス素子は、輝度、発光効率等の初期特性に優れるとともに、長い発光寿命と良好な対環境特性を持つ有機エレクトロルミネッセンス素子である。 The material for an organic electroluminescent device of the present invention is particularly excellent in stability and heat resistance, and the organic electroluminescent device using the material has excellent initial characteristics such as luminance and luminous efficiency, and has a long emission lifetime and a good environment resistance. It is an organic electroluminescence device having characteristics.
即ち、本発明は、発光領域を有する有機層が陽極と陰極との間に設けられ、電流の注入により三重項励起状態から発光する有機物質を構成要素として含む有機燐光発光素子において、前記有機層に本発明で示される化合物が含まれることにより、その化学的な安定性、特に耐熱性の向上によって、素子の耐久性に優れることを特徴とする。 That is, the present invention provides an organic phosphorescent light-emitting device in which an organic layer having a light-emitting region is provided between an anode and a cathode, and includes an organic substance that emits light from a triplet excited state by current injection as a constituent element. When the compound shown in the present invention is contained, the chemical stability, particularly heat resistance, is improved, and the durability of the device is excellent.
以下、本発明の化合物（Ａ）について具体的に説明する。 Hereinafter, the compound (A) of the present invention will be specifically described.
本発明における含窒素環としては、５員環としては、ヘテロ原子として窒素原子を１個のみ含むピロール環、窒素原子１個とその他のヘテロ原子を含むオキサゾール環、イソオキサゾール環、チアゾール環、イソチアゾール環、窒素原子を２個以上含むピラゾール環、イミダゾール環、トリアゾール環、フラザン環、オキサジアゾール環、チアジアゾール環などがある。 In the present invention, the five-membered ring includes a pyrrole ring containing only one nitrogen atom as a hetero atom, an oxazole ring containing one nitrogen atom and other hetero atoms, an isoxazole ring, a thiazole ring, Examples include a thiazole ring, a pyrazole ring containing two or more nitrogen atoms, an imidazole ring, a triazole ring, a furazane ring, an oxadiazole ring, and a thiadiazole ring.
６員環としては、ヘテロ原子として窒素原子を１個のみ含むピリジン環、窒素原子１個とその他のヘテロ原子を含むオキサジン環、窒素原子を２個以上含むピリダジン環、ピリミジン環、ピラジン環などがある。好ましくは、窒素を含む２個以上のヘテロ原子からなる５員環である。化合物におけるこれらの環は、２個以上が同一であっても、それぞれが異なっていても良い。 Examples of 6-membered rings include a pyridine ring containing only one nitrogen atom as a hetero atom, an oxazine ring containing one nitrogen atom and other hetero atoms, a pyridazine ring containing two or more nitrogen atoms, a pyrimidine ring, and a pyrazine ring. is there. Preferably, it is a 5-membered ring composed of two or more hetero atoms containing nitrogen. Two or more of these rings in the compound may be the same or different.
２個以上の上記含窒素環が他の環を介して縮合する場合の環としては、ベンゼン環、ナフタレン環、アントラセン環、ペリレン環などのアリール環や、ピリジン環、ピロール環、フラン環、ピラジン環、インドール環、キノリン環、カルバゾール環などの複素環が挙げられる。含窒素環が５員環の場合は他の環と２原子を共有する通常のオルト縮合が好ましいが、６員環の場合は３原子を共有するペリ縮合の方が好ましい。また、縮合は炭素原子のみを共有していることが好ましい。 When two or more of the above nitrogen-containing rings are condensed via another ring, examples of the ring include aryl rings such as benzene ring, naphthalene ring, anthracene ring, perylene ring, pyridine ring, pyrrole ring, furan ring, pyrazine And heterocyclic rings such as a ring, an indole ring, a quinoline ring, and a carbazole ring. When the nitrogen-containing ring is a 5-membered ring, ordinary ortho-condensation that shares 2 atoms with other rings is preferable, but when it is a 6-membered ring, peri-condensation that shares 3 atoms is more preferable. Also, the condensation preferably shares only carbon atoms.
本発明においてさらに好ましい化合物（Ａ）の骨格としては、前記一般式［１］または［２］で示される骨格である。通称としてはＸ部に入る元素によって、ベンゾビスオキサゾール、ベンゾビスチアゾール、ベンゾビスイミダゾールなどと称される。本骨格における一般式で示したＲ1〜Ｒ3、および環状の水素原子部分は下記に挙げる一般的な置換基で置換されていて構わないが、特にＲ1〜Ｒ3の好ましい例としては、アルキル基、アリール基、複素環基である。これらの基は他の基でさらに置換されていても良い。さらに具体的な例としては下記にそれぞれの基の具体例として記述したものである。 In the present invention, a more preferred skeleton of the compound (A) is a skeleton represented by the general formula [1] or [2]. Commonly referred to as benzobisoxazole, benzobisthiazole, benzobisimidazole, etc., depending on the element entering the X part. R 1 to R 3 represented by the general formula in this skeleton and the cyclic hydrogen atom portion may be substituted with the following general substituents. Particularly preferred examples of R 1 to R 3 include An alkyl group, an aryl group, and a heterocyclic group; These groups may be further substituted with other groups. More specific examples are described below as specific examples of each group.
本発明における特に限定のない一般的な置換基の種類の具体例としては、ハロゲン原子、シアノ基、ニトロ基、置換もしくは未置換のアルキル基、置換もしくは未置換のアルコキシ基、置換もしくは未置換のアリールオキシ基、置換もしくは未置換のアルキルチオ基、置換もしくは未置換のアリールチオ基、置換もしくは未置換のアミノ基、または置換もしくは未置換の炭素環基または複素環基などが挙げられる。以下にそれぞれの置換基についてさらに詳細な代表例を示すが、これらに限定されるものではなく、またこれらの置換基にはさらに置換基が結合していても良い。 Specific examples of the general substituent type that is not particularly limited in the present invention include a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted group. Examples thereof include an aryloxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted amino group, or a substituted or unsubstituted carbocyclic group or heterocyclic group. In the following, more detailed representative examples of each substituent will be shown, but the present invention is not limited thereto, and these substituents may further have a substituent bonded thereto.
本発明における置換基となるハロゲン原子としては、フッ素原子、塩素原子、臭素原子、ヨウ素原子があげられる。 Examples of the halogen atom serving as a substituent in the present invention include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
本発明における置換もしくは未置換のアルキル基としては、メチル基、エチル基、プロピル基、ブチル基、ｓｅｃ−ブチル基、ｔｅｒｔ−ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ステアリル基、２−フェニルイソプロピル基、トリクロロメチル基、トリフルオロメチル基、ベンジル基、α−フェノキシベンジル基、α，α−ジメチルベンジル基、α，α−メチルフェニルベンジル基、α，α−ジトリフルオロメチルベンジル基、トリフェニルメチル基、α−ベンジルオキシベンジル基等がある。 Examples of the substituted or unsubstituted alkyl group in the present invention include methyl group, ethyl group, propyl group, butyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, octyl group, stearyl group, 2-phenylisopropyl group, trichloromethyl group, trifluoromethyl group, benzyl group, α-phenoxybenzyl group, α, α-dimethylbenzyl group, α, α-methylphenylbenzyl group, α, α-ditrifluoromethylbenzyl group , Triphenylmethyl group, α-benzyloxybenzyl group and the like.
本発明における置換もしくは未置換のアルコキシ基としては、メトキシ基、エトキシ基、プロポキシ基、ブトキシ基、ｔｅｒｔ−ブトキシ基、オクチルオキシ基、ｔｅｒｔ−オクチルオキシ基といった未置換のアルコキシ基や、３，３，３−トリフルオロエトキシ基、ベンジルオキシ基といった置換アルコキシ基があげられる。 Examples of the substituted or unsubstituted alkoxy group in the present invention include an unsubstituted alkoxy group such as a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a tert-butoxy group, an octyloxy group, and a tert-octyloxy group; , 3-trifluoroethoxy group, and substituted alkoxy group such as benzyloxy group.
本発明における置換もしくは未置換のアリールオキシ基としては、フェノキシ基、４−ｔｅｒｔ−ブチルフェノキシ基、１−ナフチルオキシ基、２−ナフチルオキシ基、９−アンスリルオキシ基といった未置換のアリールオキシ基や、４−ニトロフェノキシ基、３−フルオロフェノキシ基、ペンタフルオロフェノキシ基、３−トリフルオロメチルフェノキシ基等の置換アリールオキシ基があげられる。 Examples of the substituted or unsubstituted aryloxy group in the present invention include unsubstituted aryloxy groups such as phenoxy group, 4-tert-butylphenoxy group, 1-naphthyloxy group, 2-naphthyloxy group, and 9-anthryloxy group. And substituted aryloxy groups such as 4-nitrophenoxy group, 3-fluorophenoxy group, pentafluorophenoxy group and 3-trifluoromethylphenoxy group.
本発明における置換もしくは未置換のアルキルチオ基としては、メチルチオ基、エチルチオ基、ｔｅｒｔ−ブチルチオ基、ヘキシルチオ基、オクチルチオ基といった未置換のアルキルチオ基や、１，１，１−テトラフルオロエチルチオ基、べンジルチオ基、トリフルオロメチルチオ基といった置換アルキルチオ基があげられる。 Examples of the substituted or unsubstituted alkylthio group in the present invention include an unsubstituted alkylthio group such as methylthio group, ethylthio group, tert-butylthio group, hexylthio group, and octylthio group, 1,1,1-tetrafluoroethylthio group, And substituted alkylthio groups such as benzylthio group and trifluoromethylthio group.
本発明における置換もしくは未置換のアリールチオ基としては、フェニルチオ基、２−メチルフェニルチオ基、４−ｔｅｒｔ−ブチルフェニルチオ基といった未置換のアリールチオ基や、３−フルオロフェニルチオ基、ペンタフルオロフェニルチオ基、３−トリフルオロメチルフェニルチオ基等の置換アリールチオ基があげられる。 Examples of the substituted or unsubstituted arylthio group in the present invention include an unsubstituted arylthio group such as a phenylthio group, a 2-methylphenylthio group, and a 4-tert-butylphenylthio group, a 3-fluorophenylthio group, and a pentafluorophenylthio group. And substituted arylthio groups such as a 3-trifluoromethylphenylthio group.
本発明における置換もしくは未置換のアミノ基としては、アミノ基、モノまたはジアルキルアミノ基、モノまたはジアリールアミノ基、アルキルアリールアミノ基などがある。アルキルアミノ基の具体例としてはエチルアミノ基、ジエチルアミノ基、ジプロピルアミノ基、ジブチルアミノ基、ベンジルアミノ基、ジベンジルアミノ基等があり、アリールアミノ基の具体例としては、フェニルアミノ基、（３−メチルフェニル）アミノ基、（４−メチルフェニル）アミノ基等があり、アリールアミノ基の具体例としては、フェニルアミノ基、フェニルメチルアミノ基、ジフェニルアミノ基、ジトリルアミノ基、ジビフェニリルアミノ基、ジ（４−メチルビフェニル）アミノ基、ジ（３−メチルフェニル）アミノ基、ジ（４−メチルフェニル）アミノ基、ナフチルフェニルアミノ基、ビス［４−（α，α’−ジメチルベンジル）フェニル］アミノ基等がある。アルキルアリールアミノ基の具体例としては、Ｎ−エチル−Ｎ−フェニルアミノ基、Ｎ−メチル−Ｎ−ナフチルアミノ基等がある。また、ビス（メトキシフェニル）アミノ基、ビス（アセトキシエチル）アミノ基等のアミノ基への置換基がさらに置換された構造も含む。 Examples of the substituted or unsubstituted amino group in the present invention include an amino group, a mono- or dialkylamino group, a mono- or diarylamino group, and an alkylarylamino group. Specific examples of the alkylamino group include an ethylamino group, a diethylamino group, a dipropylamino group, a dibutylamino group, a benzylamino group, and a dibenzylamino group. Specific examples of the arylamino group include a phenylamino group, ( 3-methylphenyl) amino group, (4-methylphenyl) amino group, etc. Specific examples of the arylamino group include phenylamino group, phenylmethylamino group, diphenylamino group, ditolylamino group, dibiphenylylamino group Di (4-methylbiphenyl) amino group, di (3-methylphenyl) amino group, di (4-methylphenyl) amino group, naphthylphenylamino group, bis [4- (α, α'-dimethylbenzyl) phenyl There are amino groups and the like. Specific examples of the alkylarylamino group include an N-ethyl-N-phenylamino group and an N-methyl-N-naphthylamino group. Also included are structures in which substituents to amino groups such as bis (methoxyphenyl) amino group and bis (acetoxyethyl) amino group are further substituted.
本発明における置換もしくは未置換の炭素環基としては、単環基もしくは縮合多環基がある。 The substituted or unsubstituted carbocyclic group in the present invention includes a monocyclic group or a condensed polycyclic group.
単環基の具体例としては、単環シクロアルキル基、単環アリール基がある。 Specific examples of the monocyclic group include a monocyclic cycloalkyl group and a monocyclic aryl group.
単環シクロアルキル基としては、シクロブチル基、シクロペンチル基、シクロヘキシル基、シクロヘプチル基、シクロオクチル基等のシクロアルキル基がある。 Examples of the monocyclic cycloalkyl group include cycloalkyl groups such as a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
単環アリール基としては、フェニル基がある。 A monocyclic aryl group includes a phenyl group.
置換もしくは未置換の縮合多環基としては、縮合多環アリール基、縮合多環シクロアルキル基等がある。 Examples of the substituted or unsubstituted condensed polycyclic group include a condensed polycyclic aryl group and a condensed polycyclic cycloalkyl group.
縮合多環アリール基としては、ナフチル基、アンスリル基、フェナンスリル基、フルオレニル基、アセナフチル基、アズレニル基、ヘプタレニル基、ピレニル基、ペリレニル基、トリフェニレニル基等がある。 Examples of the condensed polycyclic aryl group include a naphthyl group, anthryl group, phenanthryl group, fluorenyl group, acenaphthyl group, azulenyl group, heptaenyl group, pyrenyl group, perylenyl group, and triphenylenyl group.
本発明における置換もしくは未置換の複素環基としては、単環複素環基もしくは縮合多環複素環基がある。 Examples of the substituted or unsubstituted heterocyclic group in the present invention include a monocyclic heterocyclic group and a condensed polycyclic heterocyclic group.
単環複素環基としては、チエニル基、フリル基、ピロリル基、イミダゾリル基、ピラゾリル基、ピリジニル基、ピラジニル基、ピリミジニル基、ピリダジニル基、トリアジニル基、トリアゾリル基、オキサゾリル基、チアゾリル基、オキサジアゾリル基、チアジアゾリル基、イミダジアゾリル基等がある。 Examples of monocyclic heterocyclic groups include thienyl, furyl, pyrrolyl, imidazolyl, pyrazolyl, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, triazolyl, oxazolyl, thiazolyl, oxadiazolyl, There are thiadiazolyl and imidadiazolyl groups.
縮合多環複素環基としては、インドリル基、キノリル基、イソキノリル基、フタラジニル基、キノキサリニル基、キナゾリニル基、カルバゾリル基、アクリジニル基、フェナジニル基、ベンゾフリル基、イソチアゾリル基、イソキサゾリル基、フラザニル基、フェノキサジニル基、ベンゾチアゾリル基、ベンゾオキサゾリル基、ベンズイミダゾリル基、ベンゾトリアゾリル基、ピラニル基等がある。その他の縮合多環基として、１−テトラリル基、２−テトラリル基、テトラヒドロキノリル基等がある。 As the condensed polycyclic heterocyclic group, indolyl group, quinolyl group, isoquinolyl group, phthalazinyl group, quinoxalinyl group, quinazolinyl group, carbazolyl group, acridinyl group, phenazinyl group, benzofuryl group, isothiazolyl group, isoxazolyl group, furazanyl group, phenoxazinyl group Benzothiazolyl group, benzoxazolyl group, benzimidazolyl group, benzotriazolyl group, pyranyl group and the like. Examples of other condensed polycyclic groups include 1-tetralyl group, 2-tetralyl group, tetrahydroquinolyl group and the like.
本発明において、一般式［１］及び［２］で表される化合物は、例えば以下の方法により製造することができる。 In the present invention, the compounds represented by the general formulas [1] and [2] can be produced, for example, by the following method.
下記一般式［３］または一般式［４］で表される化合物をＲ1ＣＨＯおよびＲ2ＣＨＯで表されるアルデヒド化合物と、Ｎ，Ｎ’−ジメチルホルムアミドもしくはジメチルスルホキシド中で加熱することにより一般式［１］または一般式［２］で表される化合物を得ることが出来る。
一般式［３］
By heating a compound represented by the following general formula [3] or general formula [4] in an aldehyde compound represented by R 1 CHO and R 2 CHO in N, N′-dimethylformamide or dimethyl sulfoxide, A compound represented by the formula [1] or the general formula [2] can be obtained.
General formula [3]
一般式［４］ General formula [4]
［式中、Ｘ1、Ｘ2、Ｒ1、Ｒ2は前記一般式［１］または［２］と同じである。］
また、一般式［１］及び［２］で表される化合物は、Ｒ1ＣＯＯＨおよびＲ2ＣＯＯＨで表されるカルボン酸化合物と一般式［３］または一般式［４］で表される化合物とをポリリン酸中で加熱することによっても得ることが出来る。
[Wherein, X 1 , X 2 , R 1 and R 2 are the same as those in the general formula [1] or [2]. ]
Further, the compounds represented by the general formulas [1] and [2] include a carboxylic acid compound represented by R 1 COOH and R 2 COOH and a compound represented by the general formula [3] or the general formula [4]. Can also be obtained by heating in polyphosphoric acid.
以下に、本発明の化合物（Ａ）の代表例を、具体的に例示するが、本発明は、この代表例に限定されるものではない。 Specific examples of the compound (A) of the present invention are specifically shown below, but the present invention is not limited to these representative examples.
本発明における化合物（Ａ）は、耐熱性ポリマーのモノマー成分として知られるベンゾビスアゾールまたはその類似体の骨格を有するため、構造的に高い安定性を有する。このため、ガラス転移点や融点が高くなり、電界発光時における有機層中、有機層間もしくは、有機層と金属電極間で発生するジュール熱に対する耐性（耐熱性）が向上するので、有機燐光発光素子材料として使用した場合、高い発光輝度を示し、長時間発光させる際にも有利である。 The compound (A) in the present invention has a structurally high stability because it has a skeleton of benzobisazole or an analog thereof known as a monomer component of the heat-resistant polymer. Therefore, the glass transition point and the melting point are increased, and the resistance (heat resistance) against Joule heat generated in the organic layer, the organic layer, or between the organic layer and the metal electrode during electroluminescence is improved. When used as a material, it exhibits high emission brightness and is advantageous when emitting light for a long time.
有機燐光発光素子は、陽極と陰極間に一層もしくは多層の有機薄膜を形成した素子である。基本構成は従来の有機ＥＬ素子と同様であるが、三重項励起状態のエネルギーを発光に利用できるよう材料の選択と層構成の工夫を施したところが特徴となる。なお、本発明において、「燐光発光素子」とは、発光材料またはドーピング材料が三重項状態から直接的に光を放出する場合だけでなく、両極から注入された電荷の再結合によって生じた三重項励起状態を光以外のエネルギー放出に回すことなく、素子中で有効に発光に利用するような機構、過程を有するように設計された構成の素子全般を含む。この意味において、本発明の化合物は、構造的、物性的に三重項励起状態を生成、保持しやすいため、各層を構成する材料として好適である。特に素子駆動中に三重項励起状態が最も多く存在する発光層の一成分に使用すると最大の効果を発揮する。 An organic phosphorescent light-emitting device is a device in which a single-layer or multilayer organic thin film is formed between an anode and a cathode. The basic configuration is the same as that of a conventional organic EL element, but is characterized in that material selection and layer configuration are devised so that triplet excited state energy can be used for light emission. In the present invention, the “phosphorescent light-emitting element” means not only a case where a light-emitting material or a doping material directly emits light from a triplet state, but also a triplet generated by recombination of charges injected from both electrodes. It includes all elements having a structure designed to have a mechanism and a process that can be effectively used for light emission in the element without turning the excited state into energy emission other than light. In this sense, the compound of the present invention is suitable as a material constituting each layer because it easily generates and maintains a triplet excited state structurally and physically. In particular, when it is used as a component of a light emitting layer in which the triplet excited state is most present during device driving, the maximum effect is exhibited.
一層型の場合、陽極と陰極との間に発光層を設けている。発光層は、発光材料を含有し、それに加えて陽極から注入した正孔もしくは陰極から注入した電子を発光材料まで輸送させるために正孔注入材料もしくは電子注入材料を含有しても良い。電子注入材料とは陰極から電子を注入されうる能力を持つ材料であり、電子輸送材料とは注入された電子を発光層へ輸送する能力を持つ材料である。正孔注入材料とは、陽極から正孔を注入されうる能力を持つ材料であり、正孔輸送材料とは、注入された正孔を発光層へ輸送する能力を持つ材料である。多層型は、（陽極／正孔注入層／発光層／陰極）、（陽極／正孔注入層／正孔輸送層／発光層／陰極）、（陽極／発光層／電子注入層／陰極）、（陽極／発光層／電子輸送層／電子注入層／陰極）、（陽極／正孔注入層／発光層／電子注入層／陰極）、（陽極／正孔注入層／正孔輸送層／発光層／電子輸送層／電子注入層／陰極）、の多層構成で積層した有機燐光発光素子がある。多層型の正孔輸送層および電子輸送層は複数の層からなってもよい。ここで、正孔注入層と正孔輸送層、場合によっては正孔輸送性の強い発光層までを正孔注入帯域、電子注入層と電子輸送層、場合によっては電子輸送性の強い発光層までを電子注入帯域とそれぞれ呼ぶことがあり、各帯域に使用する材料を一括りで正孔注入材料（または正孔輸送材料）もしくは電子注入材料（または電子輸送材料）と呼ぶこともある。また、有機燐光発光素子の場合は、素子の特性や使用材料の点で、電子輸送層に要求される特性として、電子の輸送性より正孔が発光層から陰極側へ抜けてしまうことを阻止するブロック性をより重視するため、正孔ブロッキング層または正孔ブロック層と呼ばれることが多く、この層に用いられる材料を特に正孔ブロッキング材料と呼ぶことがある。これらの呼称は目的とする素子に対する材料の必要特性の一面を強調するために付けられているので、呼び方の違いにより材料の本質が異なることはない。これらの各層の材料とその構成は、材料のエネルギー準位、耐熱性、有機層もしくは金属電極との密着性等の各要因により選択され、決定される。 In the case of the single layer type, a light emitting layer is provided between the anode and the cathode. The light emitting layer contains a light emitting material, and may further contain a hole injecting material or an electron injecting material in order to transport holes injected from the anode or electrons injected from the cathode to the light emitting material. The electron injection material is a material having the ability to inject electrons from the cathode, and the electron transport material is a material having the ability to transport the injected electrons to the light emitting layer. The hole injection material is a material having the ability to inject holes from the anode, and the hole transport material is a material having the ability to transport the injected holes to the light emitting layer. The multilayer type includes (anode / hole injection layer / light emitting layer / cathode), (anode / hole injection layer / hole transport layer / light emitting layer / cathode), (anode / light emitting layer / electron injection layer / cathode), (Anode / light emitting layer / electron transport layer / electron injection layer / cathode), (anode / hole injection layer / light emitting layer / electron injection layer / cathode), (anode / hole injection layer / hole transport layer / light emitting layer) There is an organic phosphorescent light emitting device laminated in a multilayer structure of / electron transport layer / electron injection layer / cathode). The multilayer hole transport layer and the electron transport layer may be composed of a plurality of layers. Here, a hole injection layer and a hole transport layer, in some cases up to a light emitting layer having a strong hole transport property, up to a hole injection band, an electron injection layer and an electron transport layer, and in some cases to a light emitting layer having a strong electron transport property May be referred to as an electron injection band, and materials used in each band may be collectively referred to as a hole injection material (or hole transport material) or an electron injection material (or electron transport material). In the case of an organic phosphorescent light emitting device, the electron transporting layer is required to prevent holes from escaping from the light emitting layer to the cathode side due to the electron transportability in terms of device characteristics and materials used. In order to give more importance to the blocking property, it is often called a hole blocking layer or a hole blocking layer, and the material used for this layer is sometimes called a hole blocking material. Since these designations are given to emphasize one aspect of the necessary characteristics of the material for the target element, the essence of the material does not differ depending on the designation. The material of each of these layers and the structure thereof are selected and determined according to various factors such as the energy level of the material, heat resistance, and adhesion to the organic layer or metal electrode.
発光層には、必要があれば、本発明の化合物に加えて、さらなる既存の有機蛍光色素を含む公知の発光材料、ドーピング材料および正孔注入材料や電子注入材料を使用することもできる。有機燐光発光素子は、多層構造にすることにより、クエンチングによる輝度や寿命の低下を防ぐことができる。必要があれば、発光材料、ドーピング材料、正孔注入材料や電子注入材料を組み合わせて使用することが出来る。また、ドーピング材料により、発光輝度や発光効率の向上、青色から赤色にわたる発光を得ることもできる。 If necessary, in addition to the compound of the present invention, a known light emitting material, doping material, hole injecting material, and electron injecting material containing further existing organic fluorescent dye can be used for the light emitting layer. The organic phosphorescent light emitting element can prevent a decrease in luminance and lifetime due to quenching by adopting a multilayer structure. If necessary, a light emitting material, a doping material, a hole injection material, and an electron injection material can be used in combination. Further, by using a doping material, emission luminance and luminous efficiency can be improved, and light emission ranging from blue to red can be obtained.
本発明の化合物（Ａ）と共に発光層に使用できる燐光発光材料（Ｂ）またはドーピング材料としては、有機化合物もしくは有機残基の配位子からなる金属錯体がある。金属原子は通常、遷移金属であり、好ましくは周期では第５周期または第６周期、族では６族から１１族、さらに好ましくは８族から１０族の元素が対象となる。具体的にはイリジウムや白金などである。また、配位子としては２−フェニルピリジンや２−（２’―ベンゾチエニル）ピリジンなどがあり、これらの配位子上の炭素原子が金属と直接結合しているのが特徴である。別の例としてはポルフィリンまたはテトラアザポルフィリン環錯体などがある。中心金属としては白金などが挙げられる。燐光発光材料（Ｂ）の代表例を以下に具体的に例示するが、本発明はこの代表例に限定されるものではない。なお、本例は三重項励起状態から直接発光するとの知見が得られている材料の例であり、素子内で三重項励起エネルギーが失われずに有効に発光に利用できる何らかの機構が別に存在する場合には、さらに多くの材料を発光材料またはドーピング材料として用いることができ、既存の有機蛍光色素、有機ＥＬ発光材料、ドーピング材料をも有機燐光発光素子に利用できる可能性を否定するものではない。 Examples of the phosphorescent light emitting material (B) or doping material that can be used in the light emitting layer together with the compound (A) of the present invention include an organic compound or a metal complex composed of an organic residue ligand. The metal atom is usually a transition metal, and is preferably an element of the 5th or 6th period in the period, and from the 6th group to the 11th group in the group, and more preferably in the 8th to 10th group. Specific examples include iridium and platinum. Examples of the ligand include 2-phenylpyridine and 2- (2'-benzothienyl) pyridine, and the carbon atom on these ligands is directly bonded to the metal. Another example is a porphyrin or tetraazaporphyrin ring complex. Examples of the central metal include platinum. A typical example of the phosphorescent material (B) is specifically illustrated below, but the present invention is not limited to this representative example. Note that this example is an example of a material for which it is known that light is emitted directly from a triplet excited state, and there is another mechanism that can be used for light emission effectively without losing triplet excitation energy in the device. In addition, more materials can be used as the light emitting material or the doping material, and the possibility that the existing organic fluorescent dye, the organic EL light emitting material, and the doping material can be used for the organic phosphorescent light emitting element is not denied.
共に発光層に使用できる上記の材料および本発明の化合物（Ａ）の発光層中での存在比はどれが主成分であってもよいが、好ましくは、上記、燐光発光材料（Ｂ）またはドーピング材料に対して本発明の化合物の存在比が５０％以上であるホスト材料として使用することである。 Any of the above-mentioned materials that can be used in the light-emitting layer and the abundance ratio of the compound (A) of the present invention in the light-emitting layer may be the main component. Preferably, the phosphorescent light-emitting material (B) or doping is used. It is to be used as a host material having an abundance ratio of the compound of the present invention of 50% or more with respect to the material.
正孔注入材料としては、正孔を輸送する能力を持ち、陽極からの正孔注入効果、発光層または発光材料に対して優れた正孔注入効果を有し、発光層で生成した励起子の電子注入帯域または電子注入材料への移動を防止し、かつ薄膜形成能力の優れた化合物が挙げられる。具体的には、フタロシアニン誘導体、ナフタロシアニン誘導体、ポルフィリン誘導体、オキサゾール、オキサジアゾール、トリアゾール、イミダゾール、イミダゾロン、イミダゾールチオン、ピラゾリン、ピラゾロン、テトラヒドロイミダゾール、オキサゾール、オキサジアゾール、ヒドラゾン、アシルヒドラゾン、ポリアリールアルカン、スチルベン、ブタジエン、ベンジジン型トリフェニルアミン、スチリルアミン型トリフェニルアミン、ジアミン型トリフェニルアミン等と、それらの誘導体、およびポリビニルカルバゾール、ポリシラン、導電性高分子等の高分子材料等があるが、これらに限定されるものではない。 As a hole injection material, it has the ability to transport holes, has a hole injection effect from the anode, an excellent hole injection effect for the light emitting layer or the light emitting material, and excitons generated in the light emitting layer. Examples thereof include compounds that prevent movement to an electron injection zone or an electron injection material and have an excellent thin film forming ability. Specifically, phthalocyanine derivatives, naphthalocyanine derivatives, porphyrin derivatives, oxazole, oxadiazole, triazole, imidazole, imidazolone, imidazolethione, pyrazoline, pyrazolone, tetrahydroimidazole, oxazole, oxadiazole, hydrazone, acyl hydrazone, polyaryl Alkane, stilbene, butadiene, benzidine type triphenylamine, styrylamine type triphenylamine, diamine type triphenylamine, etc., and their derivatives, and polymer materials such as polyvinyl carbazole, polysilane, conductive polymer, etc. However, it is not limited to these.
本発明の有機燐光発光素子において使用できる正孔注入材料の中で、さらに効果的な正孔注入材料は、アリールアミン誘導体、フタロシアニン化合物ないしはトリフェニレン誘導体である。アリールアミン誘導体の具体例としては、トリフェニルアミン、トリトリルアミン、トリルジフェニルアミン、Ｎ，Ｎ’−ジフェニル−Ｎ，Ｎ’−ジ−ｍ−トリル−４，４’−ビフェニルジアミン、Ｎ，Ｎ，Ｎ’，Ｎ’−テトラ（ｐ−トリル）−ｐ−フェニレンジアミン、Ｎ，Ｎ，Ｎ’，Ｎ’−テトラ−ｐ−トリル−４，４’−ビフェニルジアミン、Ｎ，Ｎ’−ジフェニル−Ｎ，Ｎ’−ジ（１−ナフチル）−４，４’−ビフェニルジアミン、Ｎ，Ｎ’−ジ（４−ｎ−ブチルフェニル）−Ｎ，Ｎ’−ジ−ｐ−トリル−９，１０−フェナントレンジアミン、４，４’，４”−トリス（Ｎ−フェニル−Ｎ−ｍ−トリルアミノ）トリフェニルアミン、１，１−ビス［４−（ジ−ｐ−トリルアミノ）フェニル］シクロヘキサン等、もしくはこれらの芳香族三級アミン骨格を有したオリゴマーもしくはポリマー等があるが、これらに限定されるものではない。 Among the hole injection materials that can be used in the organic phosphorescent light emitting device of the present invention, more effective hole injection materials are arylamine derivatives, phthalocyanine compounds, or triphenylene derivatives. Specific examples of the arylamine derivative include triphenylamine, tolylamine, tolyldiphenylamine, N, N′-diphenyl-N, N′-di-m-tolyl-4,4′-biphenyldiamine, N, N, N ', N'-tetra (p-tolyl) -p-phenylenediamine, N, N, N', N'-tetra-p-tolyl-4,4'-biphenyldiamine, N, N'-diphenyl-N, N′-di (1-naphthyl) -4,4′-biphenyldiamine, N, N′-di (4-n-butylphenyl) -N, N′-di-p-tolyl-9,10-phenanthrenediamine 4,4 ′, 4 ″ -tris (N-phenyl-Nm-tolylamino) triphenylamine, 1,1-bis [4- (di-p-tolylamino) phenyl] cyclohexane, or the like There are oligomers or polymers having tertiary amine skeletons, though not particularly limited thereto.
フタロシアニン（Ｐｃ）化合物の具体例としては、Ｈ２Ｐｃ、ＣｕＰｃ、Ｃ ｏＰｃ、ＮｉＰｃ、ＺｎＰｃ、ＰｄＰｃ、ＦｅＰｃ、ＭｎＰｃ、ＣｌＡｌＰｃ、ＣｌＧａＰｃ、ＣｌＩｎＰｃ、ＣｌＳｎＰｃ、Ｃｌ２ＳｉＰｃ、（ＨＯ）Ａ ｌＰｃ、（ＨＯ）ＧａＰｃ、ＶＯＰｃ、ＴｉＯＰｃ、ＭｏＯＰｃ、ＧａＰｃ−Ｏ−ＧａＰｃ等のフタロシアニン誘導体およびナフタロシアニン誘導体等があるが、これらに限定されるものではない。 Specific examples of the phthalocyanine (Pc) compound include H2Pc, CuPc, CoPc, NiPc, ZnPc, PdPc, FePc, MnPc, ClAlPc, ClGaPc, ClInPc, ClSnPc, Cl2SiPc, (HO) A1Pc, (HO) GaPc, OP , Phthalocyanine derivatives such as TiOPc, MoOPc, GaPc-O-GaPc, and naphthalocyanine derivatives, but are not limited thereto.
トリフェニレン誘導体の具体例としては、ヘキサメトキシトリフェニレン、ヘキサエトキシトリフェニレン、ヘキサヘキシルオキシトリフェニレン、ヘキサベンジルオキシトリフェニレン、トリメチレンジオキシトリフェニレン、トリエチレンジオキシトリフェニレンなどのヘキサアルコキシトリフェニレン類、ヘキサフェノキシトリフェニレン、ヘキサナフチルオキシトリフェニレン、ヘキサビフェニリルオキシトリフェニレン、トリフェニレンジオキシトリフェニレンなどのヘキサアリールオキシトリフェニレン類、ヘキサアセトキシトリフェニレン、ヘキサベンゾイルオキシトリフェニレンなどのヘキサアシロキシトリフェニレン類等があるが、これらに限定されるものではない。 Specific examples of triphenylene derivatives include hexaalkoxytriphenylenes such as hexamethoxytriphenylene, hexaethoxytriphenylene, hexahexyloxytriphenylene, hexabenzyloxytriphenylene, trimethylenedioxytriphenylene, triethylenedioxytriphenylene, hexaphenoxytriphenylene, hexanaphthyl. Examples include, but are not limited to, hexaaryloxytriphenylenes such as oxytriphenylene, hexabiphenylyloxytriphenylene, and triphenylenedioxytriphenylene, and hexaacyloxytriphenylenes such as hexaacetoxytriphenylene and hexabenzoyloxytriphenylene.
電子注入材料としては、電子を輸送する能力を持ち、陰極からの正孔注入効果、発光層または発光材料に対して優れた電子注入効果を有し、発光層で生成した励起子の正孔注入帯域への移動を防止し、かつ薄膜形成能力の優れた化合物が挙げられる。例えば、フルオレノン、アントラキノジメタン、ジフェノキノン、チオピランジオキシド、オキサゾール、オキサジアゾール、トリアゾール、イミダゾール、ペリレンテトラカルボン酸、フレオレニリデンメタン、アントラキノジメタン、アントロン等とそれらの誘導体があるが、これらに限定されるものではない。また、正孔注入材料に電子受容物質を、電子注入材料に電子供与性物質を添加することにより増感させることもできる。 As an electron injection material, it has the ability to transport electrons, has a hole injection effect from the cathode, and an excellent electron injection effect for the light-emitting layer or light-emitting material, and hole injection of excitons generated in the light-emitting layer Examples thereof include compounds that prevent migration to the zone and have an excellent thin film forming ability. For example, there are fluorenone, anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, fluorenylidenemethane, anthraquinodimethane, anthrone and their derivatives. However, it is not limited to these. Further, it can be sensitized by adding an electron accepting substance to the hole injecting material and an electron donating substance to the electron injecting material.
本発明の有機燐光発光素子において、さらに効果的な電子注入材料は、金属錯体化合物もしくは含窒素五員環誘導体である。具体的には、金属錯体化合物としては、８−ヒドロキシキノリナートリチウム、ビス（８−ヒドロキシキノリナート）亜鉛、ビス（８−ヒドロキシキノリナート）銅、ビス（８−ヒドロキシキノリナート）マンガン、トリス（８−ヒドロキシキノリナート）アルミニウム、トリス（２−メチル−８−ヒドロキシキノリナート）アルミニウム、トリス（８−ヒドロキシキノリナート）ガリウム、ビス（１０−ヒドロキシベンゾ［ｈ］キノリナート）ベリリウム、ビス（１０−ヒドロキシベンゾ［ｈ］キノリナート）亜鉛、ビス（２−メチル−８−ヒドロキシキノリナート）クロロガリウム、ビス（２−メチル−８−ヒドロキシキノリナート）（ｏ−クレゾラート）ガリウム、ビス（２−メチル−８−ヒドロキシキノリナート）（１−ナフトラート）アルミニウム、ビス（２−メチル−８−ヒドロキシキノリナート）（２−ナフトラート）ガリウム、ビス（２−メチル−８−ヒドロキシキノリナート）フェノラートガリウム、ビス（ｏ−（２−ベンゾオキサゾリル）フェノラート）亜鉛、ビス（ｏ−（２−ベンゾチアゾリル）フェノラート）亜鉛、ビス（ｏ−（２−ベンゾトリアゾリル）フェノラート）亜鉛等があるが、これらに限定されるものではない。 In the organic phosphorescent light emitting device of the present invention, a more effective electron injection material is a metal complex compound or a nitrogen-containing five-membered ring derivative. Specifically, as the metal complex compound, 8-hydroxyquinolinate lithium, bis (8-hydroxyquinolinate) zinc, bis (8-hydroxyquinolinate) copper, bis (8-hydroxyquinolinate) manganese , Tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-8-hydroxyquinolinato) aluminum, tris (8-hydroxyquinolinato) gallium, bis (10-hydroxybenzo [h] quinolinato) beryllium Bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8-hydroxyquinolinato) chlorogallium, bis (2-methyl-8-hydroxyquinolinato) (o-cresolate) gallium, Bis (2-methyl-8-hydroxyquinolinate) (1-naphthlar ) Aluminum, bis (2-methyl-8-hydroxyquinolinato) (2-naphtholato) gallium, bis (2-methyl-8-hydroxyquinolinato) phenolate gallium, bis (o- (2-benzoxazolyl) (L) phenolate) zinc, bis (o- (2-benzothiazolyl) phenolate) zinc, bis (o- (2-benzotriazolyl) phenolate) zinc, and the like, but are not limited thereto.
また、含窒素五員環誘導体としては、オキサゾール、チアゾール、オキサジアゾール、チアジアゾールもしくはトリアゾール誘導体が好ましい。具体的には、２，５−ビス（１−フェニル）−１，３，４−オキサゾール、ジメチルＰＯＰＯＰ、２，５−ビス（１−フェニル）−１，３，４−チアゾール、２，５−ビス（１−フェニル）−１，３，４−オキサジアゾール、２−（４’−ｔｅｒｔ−ブチルフェニル）−５−(４”−ビフェニル)−１，３，４−オキサジアゾール、２，５−ビス（１−ナフチル）−１，３，４−オキサジアゾール、１，４−ビス［２−(５−フェニルオキサジアゾリル)］ベンゼン、１，４−ビス［２−(５−フェニルオキサジアゾリル)−４−ｔｅｒｔ−ブチルベンゼン］、２−（４’−ｔｅｒｔ−ブチルフェニル）−５−(４”−ビフェニル)−１，３，４−チアジアゾール、２，５−ビス（１−ナフチル）−１，３，４−チアジアゾール、１，４−ビス［２−(５−フェニルチアジアゾリル)］ベンゼン、２−（４’−ｔｅｒｔ−ブチルフェニル）−５−(４”−ビフェニル)−１，３，４−トリアゾール、２，５−ビス（１−ナフチル）−１，３，４−トリアゾール、１，４−ビス［２−(５−フェニルトリアゾリル)］ベンゼン等があるが、これらに限定されるものではない。 Further, as the nitrogen-containing five-membered ring derivative, an oxazole, thiazole, oxadiazole, thiadiazole or triazole derivative is preferable. Specifically, 2,5-bis (1-phenyl) -1,3,4-oxazole, dimethyl POPOP, 2,5-bis (1-phenyl) -1,3,4-thiazole, 2,5- Bis (1-phenyl) -1,3,4-oxadiazole, 2- (4′-tert-butylphenyl) -5- (4 ″ -biphenyl) -1,3,4-oxadiazole, 2, 5-bis (1-naphthyl) -1,3,4-oxadiazole, 1,4-bis [2- (5-phenyloxadiazolyl)] benzene, 1,4-bis [2- (5-phenyl) Oxadiazolyl) -4-tert-butylbenzene], 2- (4′-tert-butylphenyl) -5- (4 ″ -biphenyl) -1,3,4-thiadiazole, 2,5-bis (1- Naphthyl) -1,3,4-thiadiazole, 1,4-bis [2- (5 Phenylthiadiazolyl)] benzene, 2- (4′-tert-butylphenyl) -5- (4 ″ -biphenyl) -1,3,4-triazole, 2,5-bis (1-naphthyl) -1, Examples include, but are not limited to, 3,4-triazole and 1,4-bis [2- (5-phenyltriazolyl)] benzene.
正孔ブロッキング材料としては、正孔が陰極へ輸送されるのを阻止する能力を持ち、発光層で生成した励起子の電子注入帯域への移動を防止する効果を兼ね備え、かつ薄膜形成能力の優れた化合物が挙げられる。前記の電子注入材料の多くは正孔ブロッキング材料として使用できるが、例えば、２−（４−ビフェニル）−５−（４−ｔｅｒｔ−ブチルフェニル）−１，３，４−トリアゾールや２，５−ビス（１−フェニル）−１，３，４−オキサジアゾールに代表されるアゾール（含窒素五員環）類、バソクプロインに代表されるフェナントロリン誘導体、ビス（２−メチル−８−ヒドロキシキノリナート）（４−ビフェニルオキソラート）アルミニウム（ＩＩＩ）、ビス（２−メチル−８−ヒドロキシキノリナート）フェノラートガリウムに代表される金属錯体などの含窒素六員環類とそれらを配位子に有する金属錯体、シラシクロブテン（シロール）誘導体等があるが、これらに限定されるものではない。 As a hole blocking material, it has the ability to prevent holes from being transported to the cathode, has the effect of preventing the exciton generated in the light emitting layer from moving to the electron injection zone, and has excellent thin film forming ability Compounds. Many of the electron injection materials can be used as hole blocking materials. For example, 2- (4-biphenyl) -5- (4-tert-butylphenyl) -1,3,4-triazole and 2,5- Azoles (nitrogen-containing five-membered rings) represented by bis (1-phenyl) -1,3,4-oxadiazole, phenanthroline derivatives represented by bathocuproine, bis (2-methyl-8-hydroxyquinolinate) ) (4-biphenyloxolate) aluminum (III), nitrogen-containing six-membered rings such as metal complexes represented by bis (2-methyl-8-hydroxyquinolinato) phenolate gallium and the ligands Metal complexes, silacyclobutene (silole) derivatives, and the like, but are not limited thereto.
本発明により得られた有機燐光発光素子の、温度、湿度、雰囲気等に対する安定性の向上のために、素子の表面に保護層を設けたり、シリコンオイル、樹脂等により素子全体を保護することも可能である。 In order to improve the stability of the organic phosphorescent light-emitting device obtained by the present invention with respect to temperature, humidity, atmosphere, etc., a protective layer may be provided on the surface of the device, or the entire device may be protected with silicon oil, resin, etc. Is possible.
有機燐光発光素子の陽極に使用される導電性材料としては、４ｅＶより大きな仕事関数を持つものが適しており、炭素、アルミニウム、バナジウム、鉄、コバルト、ニッケル、タングステン、銀、金、白金、パラジウム等およびそれらの合金、ＩＴＯ基板、ＮＥＳＡ基板に使用される酸化スズ、酸化インジウム等の酸化金属、さらにはポリチオフェンやポリピロール等の有機導電性樹脂が用いられる。 As the conductive material used for the anode of the organic phosphorescent light emitting device, a material having a work function larger than 4 eV is suitable, and carbon, aluminum, vanadium, iron, cobalt, nickel, tungsten, silver, gold, platinum, palladium And their alloys, metal oxides such as tin oxide and indium oxide used for ITO substrates and NESA substrates, and organic conductive resins such as polythiophene and polypyrrole.
陰極に使用される導電性物質としては、４ｅＶより小さな仕事関数を持つものが適しており、マグネシウム、カルシウム、錫、鉛、チタニウム、イットリウム、リチウム、ルテニウム、マンガン、アルミニウム等およびそれらの合金が用いられるが、これらに限定されるものではない。合金としては、マグネシウム／銀、マグネシウム／インジウム、リチウム／アルミニウム等が代表例として挙げられるが、これらに限定されるものではない。合金の比率は、蒸着源の温度、雰囲気、真空度等により制御され、適切な比率に選択される。また、陰極としてフッ化リチウム、フッ化マグネシウム、酸化リチウムなどのアルカリ金属、アルカリ土類金属のフッ化物、酸化物を有機層上に１ｎｍ以下の膜厚で成膜し、その上にアルミニウム、銀などの比較的導電性の高い金属を成膜してもよい。また、陽極および陰極は、必要があれば二層以上の層構成により形成されていても良い。 As the conductive material used for the cathode, those having a work function smaller than 4 eV are suitable, and magnesium, calcium, tin, lead, titanium, yttrium, lithium, ruthenium, manganese, aluminum, and alloys thereof are used. However, it is not limited to these. Examples of alloys include magnesium / silver, magnesium / indium, lithium / aluminum, and the like, but are not limited thereto. The ratio of the alloy is controlled by the temperature of the vapor deposition source, the atmosphere, the degree of vacuum, etc., and is selected to an appropriate ratio. Further, as a cathode, an alkali metal such as lithium fluoride, magnesium fluoride, or lithium oxide, a fluoride of an alkaline earth metal, or an oxide is formed on the organic layer with a film thickness of 1 nm or less, and aluminum or silver is formed thereon. A metal having a relatively high conductivity such as, for example, may be formed. Moreover, the anode and the cathode may be formed with a layer structure of two or more layers if necessary.
有機燐光発光素子では、効率良く発光させるために、少なくとも一方は素子の発光波長領域において充分透明にすることが望ましい。また、基板も透明であることが望ましい。透明電極は、上記の導電性材料を使用して、蒸着やスパッタリング等の方法で所定の透光性が確保するように設定する。発光面の電極は、光透過率を１０％以上にすることが望ましい。基板は、機械的、熱的強度を有し、透明性を有するものであれば限定されるものではないが、例示すると、ガラス基板、ポリエチレン板、ポリエチレンテレフテレート板、ポリエーテルサルフォン板、ポリプロピレン板等の透明樹脂があげられる。 In the organic phosphorescent light emitting device, in order to emit light efficiently, it is desirable that at least one of them is sufficiently transparent in the light emitting wavelength region of the device. The substrate is also preferably transparent. The transparent electrode is set using the above-described conductive material so as to ensure a predetermined translucency by a method such as vapor deposition or sputtering. The electrode on the light emitting surface preferably has a light transmittance of 10% or more. The substrate is not limited as long as it has mechanical and thermal strength and has transparency. For example, a glass substrate, a polyethylene plate, a polyethylene terephthalate plate, a polyethersulfone plate, Examples thereof include a transparent resin such as a polypropylene plate.
本発明に係わる有機燐光発光素子の各層の形成は、真空蒸着、スパッタリング、プラズマ、イオンプレーティング等の乾式成膜法やスピンコーティング、ディッピング、フローコーティング等の湿式成膜法のいずれの方法を適用することができる。膜厚は特に限定されるものではないが、適切な膜厚に設定する必要がある。膜厚が厚すぎると、一定の光出力を得るために大きな印加電圧が必要になり効率が悪くなる。膜厚が薄すぎるとピンホール等が発生して、電界を印加しても充分な発光輝度が得られない。通常の膜厚は５ｎｍから１０μｍの範囲が適しているが、１０ｎｍから０．２μｍの範囲がさらに好ましい。 The formation of each layer of the organic phosphorescent light emitting device according to the present invention applies any of dry deposition methods such as vacuum deposition, sputtering, plasma, and ion plating, and wet deposition methods such as spin coating, dipping, and flow coating. can do. The film thickness is not particularly limited, but must be set to an appropriate film thickness. If the film thickness is too thick, a large applied voltage is required to obtain a constant light output, resulting in poor efficiency. If the film thickness is too thin, pinholes and the like are generated, and sufficient light emission luminance cannot be obtained even when an electric field is applied. The normal film thickness is suitably in the range of 5 nm to 10 μm, but more preferably in the range of 10 nm to 0.2 μm.
湿式成膜法の場合、各層を形成する材料を、エタノール、クロロホルム、テトラヒドロフラン、ジオキサン等の適切な溶媒に溶解または分散させて薄膜を形成するが、その溶媒はいずれであっても良い。また、いずれの有機薄膜層においても、成膜性向上、膜のピンホール防止等のため適切な樹脂や添加剤を使用しても良い。使用の可能な樹脂としては、ポリスチレン、ポリカーボネート、ポリアリレート、ポリエステル、ポリアミド、ポリウレタン、ポリスルフォン、ポリメチルメタクリレート、ポリメチルアクリレート、セルロース等の絶縁性樹脂およびそれらの共重合体、ポリ−Ｎ−ビニルカルバゾール、ポリシラン等の光導電性樹脂、ポリチオフェン、ポリピロール等の導電性樹脂を挙げることができる。また、添加剤としては、酸化防止剤、紫外線吸収剤、可塑剤等を挙げることができる。 In the case of the wet film forming method, the material for forming each layer is dissolved or dispersed in an appropriate solvent such as ethanol, chloroform, tetrahydrofuran, dioxane or the like to form a thin film, and any solvent may be used. In any organic thin film layer, an appropriate resin or additive may be used for improving film formability and preventing pinholes in the film. Usable resins include insulating resins such as polystyrene, polycarbonate, polyarylate, polyester, polyamide, polyurethane, polysulfone, polymethyl methacrylate, polymethyl acrylate, and cellulose, and copolymers thereof, poly-N-vinyl. Examples thereof include photoconductive resins such as carbazole and polysilane, and conductive resins such as polythiophene and polypyrrole. Examples of the additive include an antioxidant, an ultraviolet absorber, and a plasticizer.
以上のように、有機燐光発光素子の発光層に本発明の化合物を用いることにより、発光効率、最大発光輝度等の有機燐光発光素子特性を改良することができた。また、この素子は熱や電流に対して非常に安定であり、さらには低い駆動電圧で実用的に使用可能の発光輝度が得られるため、従来まで大きな問題であった劣化も大幅に低下させることができた。 As described above, by using the compound of the present invention in the light emitting layer of the organic phosphorescent light emitting device, the characteristics of the organic phosphorescent light emitting device such as the light emission efficiency and the maximum light emission luminance can be improved. In addition, this element is extremely stable against heat and current, and can be used for light emission brightness that can be used practically at a low driving voltage, so that the degradation that has been a major problem until now is greatly reduced. I was able to.
以下、本発明を実施例に基づきさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail based on examples.
化合物（３）の合成方法
フラスコ中に２，５−ジアミノ−１，３−ベンゼンチオール２塩酸塩６．０ｇ、ジフェニルアミノベンズアルデヒド１４ｇとジメチルスルホキシド１００ｍｌを入れて、１４０℃で６時間かくはんした。冷却後、水に注ぎ、生じた沈殿をろ過し集めた。沈殿をシリカゲルでカラム精製をおこなった後、昇華精製した。ＮＭＲ、ＦＤ−ＭＳ、ＩＲによって化合物の生成を確認した。化合物（３）のＩＲスペクトル図を図１に示す。
Synthesis method of compound (3) In a flask, 6.0 g of 2,5-diamino-1,3-benzenethiol dihydrochloride, 14 g of diphenylaminobenzaldehyde and 100 ml of dimethyl sulfoxide were added, and stirred at 140 ° C. for 6 hours. After cooling, it was poured into water and the resulting precipitate was collected by filtration. The precipitate was subjected to column purification with silica gel and then purified by sublimation. Formation of the compound was confirmed by NMR, FD-MS, and IR. An IR spectrum diagram of the compound (3) is shown in FIG.
化合物（４）の合成方法
フラスコ中に２，５−ジアミノ−１，３−ベンゼンチオール２塩酸塩４．０ｇ、アントラアルデヒド８．４ｇとジメチルスルホキシド７０ｍｌを入れて、１４０℃で６時間かくはんした。冷却後、水に注ぎ、生じた沈殿をろ過し集めた。沈殿をシリカゲルでカラム精製をおこなった後、昇華精製した。ＮＭＲ、ＦＤ−ＭＳ、ＩＲによって化合物の生成を確認した。
Method for synthesizing compound (4) In a flask, 4.0 g of 2,5-diamino-1,3-benzenethiol dihydrochloride, 8.4 g of anthraldehyde, and 70 ml of dimethyl sulfoxide were added and stirred at 140 ° C. for 6 hours. After cooling, it was poured into water and the resulting precipitate was collected by filtration. The precipitate was subjected to column purification with silica gel and then purified by sublimation. Formation of the compound was confirmed by NMR, FD-MS, and IR.
化合物（１４）の合成方法
フラスコ中に４，６−ジアミノレソルシン２塩酸塩３．０ｇ、アントラアルデヒド１２ｇとポリリン酸７０ｍｌを入れて、１５０℃で１８時間かくはんした。冷却後、水に注ぎ、生じた沈殿をろ過し集めた。沈殿をシリカゲルでカラム精製をおこなった後、昇華精製した。ＮＭＲ、ＦＤ−ＭＳ、ＩＲによって化合物の生成を確認した。
Method for synthesizing compound (14) In a flask, 3.0 g of 4,6-diaminoresorcin dihydrochloride, 12 g of anthraldehyde and 70 ml of polyphosphoric acid were added and stirred at 150 ° C. for 18 hours. After cooling, it was poured into water and the resulting precipitate was collected by filtration. The precipitate was subjected to column purification with silica gel and then purified by sublimation. Formation of the compound was confirmed by NMR, FD-MS, and IR.
以下、実施例により本発明を具体的に説明するが、本発明は下記実施例に限定されるものではない。実施例においては、特に断りのない限り、混合比は全て重量比を示す。蒸着（真空蒸着）は１０-6Ｔｏｒｒの真空中で、基板加熱、冷却等の温度制御なしの条件下で行った。また、素子の発光特性評価においては、電極面積２ｍｍ×２ｍｍの有機ＥＬ素子の特性を測定した。測定は１Ｖずつ上昇しながら各電圧で電流、輝度、色度を記録した。最大発光輝度および効率は各電圧ごとの測定値の最大値であり、その時の電圧は素子により異なる。 EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to the following Example. In the examples, all mixing ratios are weight ratios unless otherwise specified. Vapor deposition (vacuum deposition) was performed in a vacuum of 10 −6 Torr and under conditions without temperature control such as substrate heating and cooling. In the evaluation of the light emission characteristics of the element, the characteristics of an organic EL element having an electrode area of 2 mm × 2 mm were measured. The measurement recorded current, luminance, and chromaticity at each voltage while increasing by 1V. The maximum light emission luminance and efficiency are the maximum values measured for each voltage, and the voltage at that time varies depending on the element.
実施例１
洗浄したＩＴＯ電極付きガラス板上に、化合物（２０）、化合物（Ｄ２）、Ｎ，Ｎ’―（３―メチルフェニル）―Ｎ，Ｎ’―ジフェニル―１，１’―ビフェニル-４，４’―ジアミン（ＴＰＤ）、２，５−ビス（１−ナフチル）−１，３，４−オキサジアゾール、ポリカーボネート樹脂（帝人化成：パンライトＫ−１３００）を２０：５：１５：１０：５０の重量比でテトラヒドロフランに溶解させ、スピンコーティング法により膜厚１００ｎｍの発光層を得た。このとき得られた膜は非常に安定で、凝集し結晶化をおこすといった現象は観察されなかった。その上に、マグネシウムと銀を１０：１で混合した合金で膜厚１５０ｎｍの電極を形成して有機燐光発光素子を得た。この素子の発光特性は、直流電圧１０Ｖでの発光輝度１７０（ｃｄ／ｍ2）、最大発光輝度１２０００（ｃｄ／ｍ2）、発光効率４．６（ｃｄ／Ａ）の緑色発光が得られた。
Example 1
On the cleaned glass plate with ITO electrode, compound (20), compound (D2), N, N ′-(3-methylphenyl) -N, N′-diphenyl-1,1′-biphenyl-4,4 ′ -Diamine (TPD), 2,5-bis (1-naphthyl) -1,3,4-oxadiazole, polycarbonate resin (Teijin Chemicals: Panlite K-1300) at 20: 5: 15: 10: 50 A light emitting layer having a thickness of 100 nm was obtained by dissolving in tetrahydrofuran by weight and spin coating. The film obtained at this time was very stable, and the phenomenon of aggregation and crystallization was not observed. On top of this, an electrode having a thickness of 150 nm was formed from an alloy in which magnesium and silver were mixed at a ratio of 10: 1 to obtain an organic phosphorescent device. The light emission characteristics of this device were green light emission with a light emission luminance of 170 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 12000 (cd / m 2 ), and a light emission efficiency of 4.6 (cd / A). .
実施例２
洗浄したＩＴＯ電極付きガラス板上に、Ｎ，Ｎ’―（１―ナフチル）―Ｎ，Ｎ’―ジフェニル―１，１’―ビフェニル-４，４’―ジアミン（ＮＰＤ）を真空蒸着して膜厚２０ｎｍの正孔注入層を得た。次いで、化合物（２）と化合物（Ｄ１）を９３：７の比率で共蒸着し膜厚４０ｎｍの発光層を作成し、次いでビス（２−メチル−５−フェニル−８−ヒドロキシキノリナート）フェノラートガリウム錯体を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、マグネシウムと銀を１０：１で混合した合金で膜厚１００ｎｍの電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度５６００（ｃｄ／ｍ2）、最大発光輝度８８０００（ｃｄ／ｍ2）、発光効率３７（ｃｄ／Ａ）の緑色発光が得られた。
Example 2
N, N '-(1-naphthyl) -N, N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPD) is vacuum-deposited on a cleaned glass plate with an ITO electrode. A hole injection layer having a thickness of 20 nm was obtained. Next, the compound (2) and the compound (D1) were co-evaporated at a ratio of 93: 7 to prepare a light-emitting layer having a thickness of 40 nm, and then bis (2-methyl-5-phenyl-8-hydroxyquinolinato) pheno An electron injection layer having a thickness of 30 nm was obtained by depositing a gallium complex. On top of that, an electrode having a thickness of 100 nm was formed from an alloy in which magnesium and silver were mixed at a ratio of 10: 1 to obtain an organic phosphorescent device. This device emitted green light with a luminance of 5600 (cd / m 2 ) at a DC voltage of 10 V, a maximum luminance of 88000 (cd / m 2 ), and a luminous efficiency of 37 (cd / A).
実施例３
化合物（１）の代わりに化合物（４０）を用いた他は実施例２と同様にして素子を作製した。この素子は直流電圧１０Ｖでの発光輝度４３００（ｃｄ／ｍ2）、最大発光輝度６４６００（ｃｄ／ｍ2）、発光効率３２（ｃｄ／Ａ）の緑色発光が得られた。
Example 3
A device was fabricated in the same manner as in Example 2 except that the compound (40) was used instead of the compound (1). This device emitted green light with a luminance of 4300 (cd / m 2 ), a maximum luminance of 64600 (cd / m 2 ), and a luminous efficiency of 32 (cd / A) at a DC voltage of 10V.
実施例４
洗浄したＩＴＯ電極付きガラス板上に、ＮＰＤを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで、化合物（２８）と化合物（Ｄ５）を９５：５の比率で共蒸着し膜厚４０ｎｍの発光層を作成し、次いでビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−フェニルフェノラート）アルミニウム錯体を蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにトリス（８−ヒドロキシキノリナート）アルミニウム錯体（Ａｌｑ３）を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、まずフッ化リチウムを１ｎｍ、次いでアルミニウムを２００ｎｍ蒸着して電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度７２０（ｃｄ／ｍ2）、最大発光輝度３２８００（ｃｄ／ｍ2）、発光効率７．５（ｃｄ／Ａ）の赤色発光が得られた。
Example 4
NPD was vacuum-deposited on the cleaned glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 30 nm. Next, the compound (28) and the compound (D5) were co-evaporated at a ratio of 95: 5 to prepare a light-emitting layer having a thickness of 40 nm, and then bis (2-methyl-8-hydroxyquinolinate) (p-phenylphenol) Lat) An aluminum complex was vapor-deposited to form a hole blocking layer having a thickness of 10 nm, and further tris (8-hydroxyquinolinato) aluminum complex (Alq3) was vapor-deposited to obtain an electron injection layer having a thickness of 30 nm. On top of this, first, 1 nm of lithium fluoride and then 200 nm of aluminum were vapor-deposited to form an electrode to obtain an organic phosphorescent light emitting device. This device produced red light emission with a light emission luminance of 720 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 32800 (cd / m 2 ), and a light emission efficiency of 7.5 (cd / A).
実施例５
洗浄したＩＴＯ電極付きガラス板上に、化合物（４７）と化合物（Ｄ６）を９８：２の比率で塩化メチレンに溶解させ、スピンコーティング法により膜厚５０ｎｍの正孔注入型発光層を得た。次いでバソクプロインを蒸着して膜厚５ｎｍの正孔ブロッキング層、さらにＡｌｑ３を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、まずフッ化リチウムを０．５ｎｍ、次いでアルミニウムを２００ｎｍ蒸着して電極を形成して有機燐光発光素子を得た。この素子は、直流電圧１０Ｖでの発光輝度４３０（ｃｄ／ｍ2）、最大発光輝度９６００（ｃｄ／ｍ2）、発光効率５．４（ｃｄ／Ａ）の赤色発光が得られた。
Example 5
On the washed glass plate with an ITO electrode, the compound (47) and the compound (D6) were dissolved in methylene chloride at a ratio of 98: 2, and a hole injection type light emitting layer having a thickness of 50 nm was obtained by a spin coating method. Next, bathocuproine was evaporated to form a hole blocking layer having a thickness of 5 nm, and further Alq3 was evaporated to obtain an electron injection layer having a thickness of 30 nm. On top of that, first, 0.5 nm of lithium fluoride and then 200 nm of aluminum were vapor-deposited to form an electrode to obtain an organic phosphorescent light emitting device. This device obtained red light emission with a light emission luminance of 430 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 9600 (cd / m 2 ), and a light emission efficiency of 5.4 (cd / A).
実施例６
洗浄したＩＴＯ電極付きガラス板上に、ＮＰＤを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで化合物（１４）と化合物（Ｄ３）を９４：６の比率で共蒸着して膜厚５０ｎｍの発光層を得た。次いで、ビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−シアノフェノラート）ガリウム錯体を真空蒸着して膜厚２０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を蒸着して膜厚２０ｎｍの電子注入層を得た。その上に、マグネシウムと銀を１０：１（重量比）で混合した合金で膜厚２５０ｎｍの電極を形成して有機燐光発光素子を得た。この素子は、直流電圧１０Ｖでの発光輝度４４００（ｃｄ／ｍ2）、最大発光輝度３４２００（ｃｄ／ｍ2）、発光効率９．４（ｃｄ／Ａ）の青色発光が得られた。
Example 6
NPD was vacuum-deposited on the cleaned glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 30 nm. Next, the compound (14) and the compound (D3) were co-evaporated at a ratio of 94: 6 to obtain a light emitting layer having a thickness of 50 nm. Next, a bis (2-methyl-8-hydroxyquinolinate) (p-cyanophenolate) gallium complex is vacuum-deposited to form a 20-nm-thick hole blocking layer, and Alq3 is further deposited to deposit 20-nm-thick electrons. A layer was obtained. On top of this, an electrode having a thickness of 250 nm was formed from an alloy in which magnesium and silver were mixed at a ratio of 10: 1 (weight ratio) to obtain an organic phosphorescent device. This device obtained blue light emission with a light emission luminance of 4400 (cd / m 2 ), a maximum light emission luminance of 34200 (cd / m 2 ), and a light emission efficiency of 9.4 (cd / A) at a DC voltage of 10V.
実施例７
洗浄したＩＴＯ電極付きガラス板上に、銅フタロシアニンを真空蒸着して、膜厚２０ｎｍの正孔注入層を得た。次いで、化合物（３）のみを単独で真空蒸着して、膜厚３０ｎｍの正孔輸送層を得た。さらに、化合物（３）と化合物（Ｄ１）を９３：７の比率で共蒸着して、膜厚４０ｎｍの発光層を作成し、次いでバソクプロインを蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を真空蒸着して膜厚３０ｎｍの電子注入層を作成した。その上に、フッ化リチウム（ＬｉＦ）を０．７ｎｍ、次いでアルミニウム（Ａｌ）を１５０ｎｍ真空蒸着することで電極を形成して、有機燐光発光素子を得た。この素子は、直流電圧１０Ｖでの発光輝度３３３０（ｃｄ／ｍ2）、最大発光輝度９６５００（ｃｄ／ｍ2）、発光効率４５（ｃｄ／Ａ）の緑色発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は６４００時間であった。
Example 7
Copper phthalocyanine was vacuum-deposited on the washed glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 20 nm. Subsequently, only the compound (3) was vacuum-deposited alone to obtain a 30 nm-thick hole transport layer. Further, the compound (3) and the compound (D1) are co-evaporated at a ratio of 93: 7 to form a light-emitting layer having a film thickness of 40 nm, and then bathocuproine is vapor-deposited to form a hole blocking layer having a film thickness of 10 nm. Was vacuum-deposited to prepare an electron injection layer having a thickness of 30 nm. An electrode was formed thereon by vacuum deposition of 0.7 nm of lithium fluoride (LiF) and then 150 nm of aluminum (Al) to obtain an organic phosphorescent device. This element emitted green light with a light emission luminance of 3330 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 96500 (cd / m 2 ), and a light emission efficiency of 45 (cd / A). Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 6400 hours.
実施例８
洗浄したＩＴＯ電極付きガラス板上に、銅フタロシアニンを真空蒸着して、膜厚１０ｎｍの正孔注入層を得た。次いで、４，４’−ビス［Ｎ−（９−フェナントリル）−Ｎ−フェニルアミノ］ビフェニルを真空蒸着して膜厚４０ｎｍの正孔輸送層を得た。次いで、化合物（１９）と化合物（Ｄ４）を９２：８の比率で共蒸着して膜厚５０ｎｍの発光層を作成し、さらに３−（４−ビフェニリル）−４−フェニル−５−（４−ｔｅｒｔ−ブチルフェニル）−１，２，４−トリアゾールを蒸着して膜厚５ｎｍの正孔ブロッキング層を作成し、次に、ビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−シアノフェノラート）ガリウム錯体を蒸着して膜厚３０ｎｍの電子注入層を得た。さらにその上に、マグネシウムと銀を１０：１（重量比）で混合した合金で膜厚２５０ｎｍの電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖで発光輝度２７２０（ｃｄ／ｍ2）、最大発光輝度２６９００（ｃｄ／ｍ2）、発光効率１６（ｃｄ／Ａ）の発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は４３００時間であった。
Example 8
Copper phthalocyanine was vacuum-deposited on the washed glass plate with the ITO electrode to obtain a 10 nm-thick hole injection layer. Subsequently, 4,4′-bis [N- (9-phenanthryl) -N-phenylamino] biphenyl was vacuum-deposited to obtain a 40 nm-thick hole transport layer. Next, the compound (19) and the compound (D4) were co-evaporated at a ratio of 92: 8 to form a light-emitting layer having a thickness of 50 nm, and 3- (4-biphenylyl) -4-phenyl-5- (4- tert-Butylphenyl) -1,2,4-triazole was deposited to form a 5 nm thick hole blocking layer, and then bis (2-methyl-8-hydroxyquinolinate) (p-cyanopheno) Lat) gallium complex was deposited to obtain an electron injection layer having a thickness of 30 nm. Further, an electrode having a thickness of 250 nm was formed from an alloy in which magnesium and silver were mixed at a weight ratio of 10: 1 to obtain an organic phosphorescent device. This device emitted light with a luminance of 2720 (cd / m 2 ), a maximum luminance of 26900 (cd / m 2 ), and a luminous efficiency of 16 (cd / A) at a DC voltage of 10V. Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 4300 hours.
実施例９
洗浄したＩＴＯ電極付きガラス板上に、ＮＰＤを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで、化合物（６）と化合物（Ｄ７）を９７：３の比率で共蒸着して膜厚４０ｎｍの発光層を作成し、次いで、化合物（６）のみを単独で蒸着して膜厚３０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を真空蒸着して膜厚２０ｎｍの電子注入層を作成した。その上にまず、フッ化リチウムを０．５ｎｍ、さらにアルミニウムを２００ｎｍ真空蒸着によって電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度１６００（ｃｄ／ｍ2）、最大発光輝度１８６００（ｃｄ／ｍ2）、発光効率９．２（ｃｄ／Ａ）の赤色発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は４６００時間であった。
Example 9
NPD was vacuum-deposited on the cleaned glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 30 nm. Next, compound (6) and compound (D7) were co-evaporated at a ratio of 97: 3 to form a 40 nm-thick luminescent layer, and then only compound (6) was vapor-deposited alone to form a positive 30 nm-thick film. A hole blocking layer and further Alq3 were vacuum deposited to form an electron injection layer having a thickness of 20 nm. First, an electrode was formed by vacuum deposition of 0.5 nm of lithium fluoride and 200 nm of aluminum, to obtain an organic phosphorescent device. This device produced red light emission with a light emission luminance of 1600 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 18600 (cd / m 2 ), and a light emission efficiency of 9.2 (cd / A). Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 4600 hours.
実施例１０
洗浄したＩＴＯ電極付きガラス板上に、ＮＰＤを真空蒸着して膜厚５０ｎｍの正孔注入層を得た。次いで、化合物（４）と化合物（Ｄ３）を８５：１５の重量比で共蒸着して膜厚４０ｎｍの発光層を作成し、次いで、ビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−フェニルフェノラート）アルミニウム錯体を蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を蒸着して膜厚３０ｎｍの電子注入層を得た。さらにその上に、まず、フッ化マグネシウムを０．５ｎｍ、さらにアルミニウムを２００ｎｍ真空蒸着によって電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度２７５０（ｃｄ／ｍ2）、最大発光輝度４６５００（ｃｄ／ｍ2）、発光効率６．４（ｃｄ／Ａ）の発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は２８００時間であった。
Example 10
NPD was vacuum-deposited on the cleaned glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 50 nm. Then, the compound (4) and the compound (D3) are co-evaporated at a weight ratio of 85:15 to form a light-emitting layer having a thickness of 40 nm, and then bis (2-methyl-8-hydroxyquinolinate) (p -Phenylphenolate) An aluminum complex was vapor-deposited to form a hole blocking layer having a thickness of 10 nm, and further Alq3 was vapor-deposited to obtain an electron injection layer having a thickness of 30 nm. Furthermore, an electrode was first formed thereon by vacuum deposition of 0.5 nm of magnesium fluoride and 200 nm of aluminum, to obtain an organic phosphorescent light emitting device. This device emitted light having a light emission luminance of 2750 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 46500 (cd / m 2 ), and a light emission efficiency of 6.4 (cd / A). Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 2800 hours.
比較例１
化合物（２０）に代わりに下記化合物（Ｃ１）を用いた他は実施例１と同様にして素子を作成した。そのスピンコート膜は容易に凝集し結晶化を起こしてしまうといった欠点を持っていた。この素子の発光特性は、直流電圧１０Ｖでの発光輝度８０（ｃｄ／ｍ2）、最大発光輝度１４００（ｃｄ／ｍ2）、発光効率１．６（ｃｄ／Ａ）の発光は得られたが、均一の発光ではなく明るい部分と暗い部分が混在していた。また発光輝度５００（ｃｄ／ｍ2）で定電流駆動すると４時間ほどで短絡してしまった。
化合物（Ｃ１）
Comparative Example 1
A device was prepared in the same manner as in Example 1 except that the following compound (C1) was used instead of the compound (20). The spin coat film has the disadvantage that it easily aggregates and crystallizes. The light emission characteristics of this device were that light emission with a direct current voltage of 10 V was 80 (cd / m 2 ), the maximum light emission luminance was 1400 (cd / m 2 ), and the light emission efficiency was 1.6 (cd / A). The light and dark areas were mixed, not uniform light emission. In addition, when the device was driven at a constant current at an emission luminance of 500 (cd / m 2 ), the short circuit occurred in about 4 hours.
Compound (C1)
比較例２
化合物（２）に代わりにＣＢＰを用いた他は実施例２と同様にして素子を作成した。この素子の発光特性は、直流電圧１０Ｖでの発光輝度１７００（ｃｄ／ｍ2）、最大発光輝度４８０００（ｃｄ／ｍ2）、発光効率２５（ｃｄ／Ａ）の発光は得られた。しかし、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は８２０時間であった。
Comparative Example 2
A device was prepared in the same manner as in Example 2 except that CBP was used instead of the compound (2). With respect to the light emission characteristics of this device, light emission with a direct current voltage of 10 V of light emission luminance of 1700 (cd / m 2 ), maximum light emission luminance of 48000 (cd / m 2 ), and light emission efficiency of 25 (cd / A) was obtained. However, the half-life when driven at a constant current with an emission luminance of 500 (cd / m 2 ) was 820 hours.
比較例３
化合物（４）に代わりに下記化合物（Ｃ２）を用いた他は実施例１０と同様にして素子を作成した。この素子の発光特性は、直流電圧１０Ｖでの発光輝度１５６０（ｃｄ／ｍ2）、最大発光輝度３２４００（ｃｄ／ｍ2）、発光効率４．２（ｃｄ／Ａ）の発光は得られた。しかし、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は１５０時間であった。
化合物（Ｃ２）
Comparative Example 3
A device was prepared in the same manner as in Example 10 except that the following compound (C2) was used instead of the compound (4). With respect to the light emission characteristics of the device, light emission with a direct current voltage of 10 V of light emission luminance of 1560 (cd / m 2 ), maximum light emission luminance of 32400 (cd / m 2 ), and light emission efficiency of 4.2 (cd / A) was obtained. However, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 150 hours.
Compound (C2)
実施例１１
化合物（２８）の代わりに化合物（３４）を用いた他は実施例４と同様にして素子を作成した。この素子は直流電圧１０Ｖでの発光輝度７５０（ｃｄ／ｍ2）、最大発光輝度１８２００（ｃｄ／ｍ2）、発光効率１０．７（ｃｄ／Ａ）の赤色発光が得られた。また発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は９８００時間であった。
Example 11
A device was prepared in the same manner as in Example 4 except that the compound (34) was used instead of the compound (28). This device produced red light emission with a light emission luminance of 750 (cd / m 2 ), a maximum light emission luminance of 18200 (cd / m 2 ), and a light emission efficiency of 10.7 (cd / A) at a DC voltage of 10V. The half life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 9800 hours.
実施例１２
洗浄したＩＴＯ電極付きガラス板上に、銅フタロシアニンを真空蒸着して、膜厚２０ｎｍの正孔注入層を得た。次いで、ＮＰＤを真空蒸着して、膜厚３０ｎｍの正孔輸送層を得た。さらに、化合物（１０）と化合物（Ｄ２）を９０：１０の比率で共蒸着して、膜厚４０ｎｍの発光層を作成し、次いでビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−シアノフェノラート）アルミニウム錯体を蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を真空蒸着して膜厚３０ｎｍの電子注入層を作成した。その上に、フッ化リチウムを０．７ｎｍ、次いでアルミニウムを２００ｎｍ真空蒸着することで電極を形成して、有機燐光発光素子を得た。この素子は、直流電圧１０Ｖでの発光輝度６４１０（ｃｄ／ｍ2）、最大発光輝度７９３００（ｃｄ／ｍ2）、発光効率３８（ｃｄ／Ａ）の発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は４２００時間であった。
Example 12
Copper phthalocyanine was vacuum-deposited on the washed glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 20 nm. Subsequently, NPD was vacuum-deposited to obtain a hole transport layer having a thickness of 30 nm. Further, the compound (10) and the compound (D2) were co-evaporated at a ratio of 90:10 to prepare a light emitting layer having a thickness of 40 nm, and then bis (2-methyl-8-hydroxyquinolinate) (p- A 10-nm-thick hole blocking layer was formed by vapor-depositing a cyanophenolate) aluminum complex, and Alq3 was further vacuum-deposited to form an electron-injecting layer having a thickness of 30 nm. An electrode was formed thereon by vacuum-depositing lithium fluoride at 0.7 nm and then aluminum at 200 nm to obtain an organic phosphorescent device. This device emitted light with a luminance of 6410 (cd / m 2 ), a maximum luminance of 79300 (cd / m 2 ), and a luminous efficiency of 38 (cd / A) at a DC voltage of 10V. Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 4200 hours.
実施例１３
洗浄したＩＴＯ電極付きガラス板上に、４，４’−ビス［Ｎ−（９−フェナントリル）−Ｎ−フェニルアミノ］ビフェニルを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで化合物（１６）と化合物（Ｄ３）を９５：５の比率で共蒸着して膜厚５０ｎｍの発光層を得た。次いで、ビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−フェニルフェノラート）アルミニウム錯体を真空蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにビス（２−メチル−５−フェニル−８−ヒドロキシキノリナート）フェノラートガリウム錯体を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、マグネシウムと銀を１０：１（重量比）で混合した合金で膜厚２５０ｎｍの電極を形成して有機燐光発光素子を得た。この素子は、直流電圧１０Ｖでの発光輝度７４００（ｃｄ／ｍ2）、最大発光輝度５６１００（ｃｄ／ｍ2）、発光効率８．０（ｃｄ／Ａ）の青色発光が得られた。
Example 13
On the washed glass plate with an ITO electrode, 4,4′-bis [N- (9-phenanthryl) -N-phenylamino] biphenyl was vacuum-deposited to obtain a hole injection layer having a thickness of 30 nm. Next, the compound (16) and the compound (D3) were co-evaporated at a ratio of 95: 5 to obtain a light emitting layer having a thickness of 50 nm. Next, a bis (2-methyl-8-hydroxyquinolinate) (p-phenylphenolate) aluminum complex was vacuum-deposited to form a 10 nm-thick hole blocking layer, and bis (2-methyl-5-phenyl-8). -Hydroxyquinolinato) phenolate gallium complex was evaporated to obtain an electron injection layer having a thickness of 30 nm. On top of this, an electrode having a thickness of 250 nm was formed from an alloy in which magnesium and silver were mixed at a ratio of 10: 1 (weight ratio) to obtain an organic phosphorescent device. This device produced blue light emission with a light emission luminance of 7400 (cd / m 2 ), a maximum light emission luminance of 56100 (cd / m 2 ), and a light emission efficiency of 8.0 (cd / A) at a DC voltage of 10V.
実施例１４
化合物（３）の代わりに化合物（２９）を用いた他は実施例７と同様にして素子を作成した。この素子は直流電圧１０Ｖでの発光輝度７４３０（ｃｄ／ｍ2）、最大発光輝度５７２００（ｃｄ／ｍ2）、発光効率４４（ｃｄ／Ａ）の緑色発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は７５００時間であった。
Example 14
A device was prepared in the same manner as in Example 7 except that the compound (29) was used instead of the compound (3). This device is the light emission luminance at a DC voltage 10V 7430 (cd / m 2) , the maximum emission luminance 57200 (cd / m 2), green light emission efficiency 44 (cd / A) was obtained. Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 7500 hours.
実施例１５
洗浄したＩＴＯ電極付きガラス板上に、４，４’，４”−トリス［Ｎ−（１−ナフチル）−Ｎ−フェニルアミノ］トリフェニルアミンを真空蒸着して膜厚２０ｎｍの正孔注入層を得た。次いで、ＮＰＤを真空蒸着して、膜厚３０ｎｍの正孔輸送層を得た。さらに、化合物（３８）と化合物（Ｄ６）を９７：３の比率で共蒸着して、膜厚４０ｎｍの発光層を作成し、次いでバソフェナントロリンを蒸着して膜厚５ｎｍの正孔ブロッキング層、さらにＡｌｑ３を真空蒸着して膜厚３０ｎｍの電子注入層を作成した。その上に、フッ化リチウムを０．７ｎｍ、次いでアルミニウムを２００ｎｍ真空蒸着することで電極を形成して、有機燐光発光素子を得た。この素子は、直流電圧１０Ｖでの発光輝度６６３０（ｃｄ／ｍ2）、最大発光輝度１１２００（ｃｄ／ｍ2）、発光効率５．６（ｃｄ／Ａ）の発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は８６００時間であった。
Example 15
4,4 ′, 4 ″ -tris [N- (1-naphthyl) -N-phenylamino] triphenylamine is vacuum-deposited on a cleaned glass plate with an ITO electrode to form a 20 nm-thick hole injection layer. Next, NPD was vacuum-deposited to obtain a 30 nm-thick hole transport layer, and compound (38) and compound (D6) were co-deposited at a ratio of 97: 3 to give a thickness of 40 nm. Then, a 5 nm-thick hole blocking layer was deposited by vapor deposition of bathophenanthroline, and an electron injection layer having a thickness of 30 nm was created by vacuum-depositing Alq3. An electrode was formed by vacuum deposition of 0.7 nm and then 200 nm of aluminum to obtain an organic phosphorescent light emitting device having an emission luminance of 6630 (cd / m 2 ) at a DC voltage of 10 V and a maximum emission luminance of 11200. (Cd / m 2 ), a light emission efficiency of 5.6 (cd / A) was obtained, and the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 8600 hours. .
実施例１６
洗浄したＩＴＯ電極付きガラス板上に、ＮＰＤを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで、化合物（４６）と化合物（Ｄ５）を９８：２の比率で共蒸着し膜厚４０ｎｍの発光層を作成し、次いでビス（２−メチル−８−ヒドロキシキノリナート）（ｐ−フェニルフェノラート）アルミニウム錯体を蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、まずフッ化リチウムを１ｎｍ、次いでアルミニウムを２００ｎｍ蒸着して電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度１４２０（ｃｄ／ｍ2）、最大発光輝度１４６００（ｃｄ／ｍ2）、発光効率７．７（ｃｄ／Ａ）の赤色発光が得られた。
Example 16
NPD was vacuum-deposited on the cleaned glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 30 nm. Subsequently, the compound (46) and the compound (D5) were co-evaporated at a ratio of 98: 2 to prepare a light-emitting layer having a thickness of 40 nm, and then bis (2-methyl-8-hydroxyquinolinate) (p-phenylphenol) Lat) An aluminum complex was evaporated to form a hole blocking layer having a thickness of 10 nm, and further Alq3 was evaporated to obtain an electron injection layer having a thickness of 30 nm. On top of this, first, 1 nm of lithium fluoride and then 200 nm of aluminum were vapor-deposited to form an electrode to obtain an organic phosphorescent light emitting device. This device produced red light emission with a light emission luminance of 1420 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 14600 (cd / m 2 ), and a light emission efficiency of 7.7 (cd / A).
実施例１７
洗浄したＩＴＯ電極付きガラス板上に、ＮＰＤを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで、化合物（１２）と化合物（Ｄ１）を９５：５の比率で共蒸着し膜厚４０ｎｍの発光層を作成し、次いでビス（２−メチル−８−ヒドロキシキノリナート）フェノラートアルミニウム錯体を蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、まずフッ化リチウムを１ｎｍ、次いでアルミニウムを２００ｎｍ蒸着して電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度２６７０（ｃｄ／ｍ2）、最大発光輝度８９３００（ｃｄ／ｍ2）、発光効率４１（ｃｄ／Ａ）の緑色発光が得られた。
Example 17
NPD was vacuum-deposited on the cleaned glass plate with an ITO electrode to obtain a hole injection layer having a thickness of 30 nm. Subsequently, the compound (12) and the compound (D1) are co-evaporated at a ratio of 95: 5 to prepare a light emitting layer having a thickness of 40 nm, and then a bis (2-methyl-8-hydroxyquinolinato) phenolate aluminum complex is formed. A hole blocking layer having a thickness of 10 nm was deposited, and Alq3 was further deposited to obtain an electron injection layer having a thickness of 30 nm. On top of this, first, 1 nm of lithium fluoride and then 200 nm of aluminum were vapor-deposited to form an electrode to obtain an organic phosphorescent light emitting device. This device emitted green light with a luminance of 2670 (cd / m 2 ), a maximum luminance of 89300 (cd / m 2 ), and a luminous efficiency of 41 (cd / A) at a DC voltage of 10V.
実施例１８
洗浄したＩＴＯ電極付きガラス板上に、４，４’−ビス［Ｎ−（９−フェナントリル）−Ｎ−フェニルアミノ］ビフェニルを真空蒸着して膜厚３０ｎｍの正孔注入層を得た。次いで、化合物（２６）と化合物（Ｄ１）を９３：７の比率で共蒸着し膜厚４０ｎｍの発光層を作成し、次いでビス（２−メチル−５−フェニル−８−ヒドロキシキノリナート）フェノラートアルミニウム錯体を蒸着して膜厚１０ｎｍの正孔ブロッキング層、さらにＡｌｑ３を蒸着して膜厚３０ｎｍの電子注入層を得た。その上に、まずフッ化リチウムを１ｎｍ、次いでアルミニウムを２００ｎｍ蒸着して電極を形成して有機燐光発光素子を得た。この素子は直流電圧１０Ｖでの発光輝度２４４０（ｃｄ／ｍ2）、最大発光輝度８９９００（ｃｄ／ｍ2）、発光効率４７（ｃｄ／Ａ）の緑色発光が得られた。また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は９１００時間であった。
Example 18
On the washed glass plate with an ITO electrode, 4,4′-bis [N- (9-phenanthryl) -N-phenylamino] biphenyl was vacuum-deposited to obtain a hole injection layer having a thickness of 30 nm. Next, the compound (26) and the compound (D1) were co-evaporated at a ratio of 93: 7 to prepare a light-emitting layer having a thickness of 40 nm, and then bis (2-methyl-5-phenyl-8-hydroxyquinolinato) pheno Lat aluminum complex was evaporated to form a hole blocking layer having a thickness of 10 nm, and Alq3 was further evaporated to obtain an electron injection layer having a thickness of 30 nm. On top of this, first, 1 nm of lithium fluoride and then 200 nm of aluminum were vapor-deposited to form an electrode to obtain an organic phosphorescent light emitting device. This device produced green light emission with a light emission luminance of 2440 (cd / m 2 ) at a DC voltage of 10 V, a maximum light emission luminance of 89900 (cd / m 2 ), and a light emission efficiency of 47 (cd / A). Further, the half-life when driven at a constant current at an emission luminance of 500 (cd / m 2 ) was 9100 hours.
比較例４
化合物（２６）の代わりに下記化合物（Ｃ３）を用いた他は実施例１８と同様にして素子を作成した。この素子は直流電圧１０Ｖでの発光輝度２２０（ｃｄ／ｍ2）、最大発光輝度２２６００（ｃｄ／ｍ2）、発光効率１９（ｃｄ／Ａ）であり、また、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したときの半減寿命は８６０時間であった。
化合物（Ｃ３）
Comparative Example 4
A device was prepared in the same manner as in Example 18 except that the following compound (C3) was used instead of the compound (26). This element has an emission luminance of 220 (cd / m 2 ) at a DC voltage of 10 V, a maximum emission luminance of 22600 (cd / m 2 ), an emission efficiency of 19 (cd / A), and an emission luminance of 500 (cd / m 2). ), The half-life when driven at a constant current was 860 hours.
Compound (C3)
本実施例で半減寿命を明記した例以外の素子において、発光輝度５００（ｃｄ／ｍ2）で定電流駆動したところ、全ての実施例の素子において１０００時間の時点で初期輝度の８割より低下したものはなかった。 In the devices other than the examples in which the half life was specified in this example, when the device was driven at a constant current with a light emission luminance of 500 (cd / m 2 ), all of the devices of the examples were reduced from 80% of the initial luminance at 1000 hours. There was nothing I did.
実施例１９
実施例７と同様に作成した素子を１２０℃の真空オーブン中に９６時間入れた後、室温大気圧下で素子特性を測定したところ、直流電圧１０Ｖでの発光輝度３０９０（ｃｄ／ｍ2）、最大発光輝度８２５００（ｃｄ／ｍ2）、発光効率４２（ｃｄ／Ａ）の緑色発光を保っていた。
Example 19
The device prepared in the same manner as in Example 7 was placed in a 120 ° C. vacuum oven for 96 hours, and then the device characteristics were measured at room temperature and atmospheric pressure. As a result, the emission luminance at a DC voltage of 10 V was 3090 (cd / m 2 ), Green light emission with a maximum light emission luminance of 82500 (cd / m 2 ) and a light emission efficiency of 42 (cd / A) was maintained.
比較例５
比較例２と同様に作成した素子を１２０℃の真空オーブン中に９６時間入れた後、室温大気圧下で素子特性を測定したところ、直流電圧１０Ｖでの発光輝度８００（ｃｄ／ｍ2）、最大発光輝度２２０００（ｃｄ／ｍ2）、発光効率１１（ｃｄ／Ａ）に低下していた。
Comparative Example 5
The device prepared in the same manner as in Comparative Example 2 was placed in a 120 ° C. vacuum oven for 96 hours, and then the device characteristics were measured at room temperature and atmospheric pressure. As a result, the emission luminance at a DC voltage of 10 V was 800 (cd / m 2 ), The maximum emission luminance was 22000 (cd / m 2 ) and the emission efficiency was 11 (cd / A).
実施例２０
実施例１８と同様に作成した素子を１５０℃の真空オーブン中に２４時間入れた後、室温大気圧下で素子特性を測定したところ、直流電圧１０Ｖでの発光輝度１８５０（ｃｄ／ｍ2）、最大発光輝度６９８００（ｃｄ／ｍ2）、発光効率３９（ｃｄ／Ａ）の緑色発光を保っていた。
Example 20
The device prepared in the same manner as in Example 18 was placed in a vacuum oven at 150 ° C. for 24 hours, and then the device characteristics were measured at room temperature and atmospheric pressure. As a result, the emission luminance at a DC voltage of 10 V was 1850 (cd / m 2 ), Green light emission with a maximum light emission luminance of 69800 (cd / m 2 ) and a light emission efficiency of 39 (cd / A) was maintained.
比較例６
比較例４と同様に作成した素子を１５０℃の真空オーブン中に２４時間入れた後、室温大気圧下で素子特性を測定したところ、直流電圧１０Ｖでの発光輝度７０（ｃｄ／ｍ2）、最大発光輝度６２００（ｃｄ／ｍ2）、発光効率５．８（ｃｄ／Ａ）に低下していた。
Comparative Example 6
The device prepared in the same manner as in Comparative Example 4 was placed in a 150 ° C. vacuum oven for 24 hours, and then the device characteristics were measured at room temperature and atmospheric pressure. As a result, the emission luminance at a DC voltage of 10 V was 70 (cd / m 2 ), The maximum light emission luminance was 6200 (cd / m 2 ) and the light emission efficiency was 5.8 (cd / A).
実施例２〜１８の素子のうち、上記実施例１９、２０以外の素子を、１２０℃の真空オーブン中に９６時間入れた後、室温大気圧下で素子特性を測定したところ、全ての素子において、輝度、効率などの諸特性が初期の８割を下回ることはなかった。 Among the elements of Examples 2 to 18, the elements other than Examples 19 and 20 were placed in a vacuum oven at 120 ° C. for 96 hours, and then the element characteristics were measured at room temperature and atmospheric pressure. The various characteristics such as brightness and efficiency did not fall below 80% of the initial values.
本発明の有機燐光発光素子は、壁掛けテレビ等のフラットパネルディスプレイや、平面発光体として、複写機やプリンター等の光源、液晶ディスプレイや計器類等の光源、表示板、標識灯等へ応用が考えられ、その工業的価値は非常に大きい。また、本発明の材料は、従来型の有機ＥＬ素子、電子写真感光体、光電変換素子、太陽電池、イメージセンサー等の分野においても使用できる。 The organic phosphorescent light emitting device of the present invention can be applied to flat panel displays such as wall-mounted televisions, flat light emitters, light sources such as copiers and printers, light sources such as liquid crystal displays and instruments, display boards, and indicator lights. And its industrial value is very large. The material of the present invention can also be used in the fields of conventional organic EL devices, electrophotographic photoreceptors, photoelectric conversion devices, solar cells, image sensors and the like.
Claims (10)
燐光発光材料（Ｂ）を含んでなる有機エレクトロルミネッセンス素子用材料。 For an organic electroluminescence device comprising a condensed heterocyclic compound (A) in which two or more identical or different nitrogen-containing rings are condensed directly or via another carbocyclic or heterocyclic ring, and a phosphorescent material (B) material.
一般式［１］
Ｒ1〜Ｒ3はそれぞれ独立に、置換もしくは未置換のアルキル基、置換もしくは未置換のシクロアルキル基、置換もしくは未置換のアリール基または複素環基である。前記Ｒ1〜Ｒ3および中央の炭素環の非縮合部分は、それぞれ独立に、ハロゲン原子、シアノ基、ニトロ基、置換もしくは未置換のアルキル基、置換もしくは未置換のアルコキシ基、置換もしくは未置換のアリールオキシ基、置換もしくは未置換のアルキルチオ基、置換もしくは未置換のアリールチオ基、置換もしくは未置換のアミノ基、置換もしくは未置換のアシル基、置換もしくは未置換のアリール基、または複素環基で置換されていても良く、置換基同士で一体となって環を形成していても良い。］ The material for an organic electroluminescence device according to claim 2, wherein the compound (A) is a compound represented by the following general formula [1] or [2].
General formula [1]
R 1 to R 3 are each independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a heterocyclic group. R 1 to R 3 and the non-condensed part of the central carbocycle are each independently a halogen atom, cyano group, nitro group, substituted or unsubstituted alkyl group, substituted or unsubstituted alkoxy group, substituted or unsubstituted An aryloxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted amino group, a substituted or unsubstituted acyl group, a substituted or unsubstituted aryl group, or a heterocyclic group It may be substituted, and the substituents may be combined to form a ring. ]
Furthermore, a positive hole injection layer is formed between an anode and a light emitting layer, The organic electroluminescent element in any one of Claims 6-9 characterized by the above-mentioned.
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