WO2013047981A1 - 최소 적층 구조의 청색 인광 유기 발광소자 - Google Patents
최소 적층 구조의 청색 인광 유기 발광소자 Download PDFInfo
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- WO2013047981A1 WO2013047981A1 PCT/KR2012/005210 KR2012005210W WO2013047981A1 WO 2013047981 A1 WO2013047981 A1 WO 2013047981A1 KR 2012005210 W KR2012005210 W KR 2012005210W WO 2013047981 A1 WO2013047981 A1 WO 2013047981A1
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- Prior art keywords
- light emitting
- layer
- organic light
- anode
- blue phosphorescent
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- 239000002019 doping agent Substances 0.000 claims abstract description 20
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- UJOBWOGCFQCDNV-UHFFFAOYSA-N Carbazole Natural products C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 claims description 38
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- ZOKIJILZFXPFTO-UHFFFAOYSA-N 4-methyl-n-[4-[1-[4-(4-methyl-n-(4-methylphenyl)anilino)phenyl]cyclohexyl]phenyl]-n-(4-methylphenyl)aniline Chemical compound C1=CC(C)=CC=C1N(C=1C=CC(=CC=1)C1(CCCCC1)C=1C=CC(=CC=1)N(C=1C=CC(C)=CC=1)C=1C=CC(C)=CC=1)C1=CC=C(C)C=C1 ZOKIJILZFXPFTO-UHFFFAOYSA-N 0.000 description 1
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K50/14—Carrier transporting layers
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- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
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- H10K85/649—Aromatic compounds comprising a hetero atom
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- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
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- C09K2211/1018—Heterocyclic compounds
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- H10K2102/301—Details of OLEDs
- H10K2102/351—Thickness
Definitions
- the present specification relates to a blue phosphorescent organic light emitting device having a minimum stack structure. More particularly, the present invention relates to a blue phosphorescent organic light emitting diode having a minimum laminated structure, which has excellent characteristics as a blue device, and which has a simple manufacturing process as a minimum laminated structure and has a small thickness, which can be usefully used for a flexible display.
- Display is being used most recently by moving from conventional CRT display to LCD, a flat panel display that can be portable.
- LCDs are light-receiving devices, they have technical limitations such as brightness, contrast, viewing angle, and large area, and thus, new devices need to be developed to overcome these disadvantages.
- OLED Organic Light Emitting Device
- OLEDs Organic light emitting diodes
- PM passive matrix organic light emitting diodes
- AM active matrix
- Phosphorescence emission is a mechanism in which electrons transfer from the ground state to the excited state, and then the singlet excitons are non-luminesced to triplet excitons through intersystem crossing, and then the triplet excitons are emitted to the ground state. mechanism).
- Such phosphorescence emission has a characteristic that the life time (luminescence time) is longer than that of fluorescence because the phosphorescence emission does not directly transition to the ground state when the triplet excitons are transitioned to the ground state after the reverse of the electron spin. That is, the emission duration of the fluorescence emission is only several nanoseconds, but the phosphorescence emission corresponds to several micro seconds, which is a relatively long time.
- the phosphorescent organic light emitting diode has a multilayer structure.
- 1 illustrates a laminated structure of a general phosphorescent organic light emitting diode (PhOLED) according to the prior art. Referring to FIG.
- a phosphorescent organic light emitting diode PhOLED includes an anode formed of an ITO transparent electrode; A hole injection layer (HIL) formed on the anode; A hole transport layer (HTL) formed on the hole injection layer (HIL); An emission layer (EML) formed on the hole transport layer (HTL); A hole blocking layer (HBL) formed on the light emitting layer (EML); An electron transport layer (ETL) formed on the hole blocking layer (HBL); An electron injection layer (EIL) formed on the electron transport layer (ETL); And a cathode formed on the electron injection layer EIL, which are sequentially stacked on the substrate through a deposition method.
- the emission layer EML includes a host as a charge transfer material and a dopant as a phosphor.
- the selection of the host directly affects the luminous efficiency. Since luminescence of the phosphor occurs from the triplet, the triplet energy (ET) of the host is greater than the triplet energy (ET) of the dopant, so that the triplet energy (ET) transition from the host to the dopant can occur more effectively. have. In addition, since triplet energy (ET) is about 1 eV lower than that of singlet energy, a material having a larger gap between highest occupied molecular orbital (HOMO) and lower unoccupied molecular orbital (LUMO) than a fluorescent material is preferable as a host material. .
- HOMO highest occupied molecular orbital
- LUMO unoccupied molecular orbital
- the triplet energy (ET) of the host should be high to increase the luminous efficiency.
- the host must have excellent electrical characteristics such as charge mobility and excellent thermal stability.
- the HOMO energy level of NPB which is commonly used as a hole transport layer (HTL)
- HTL hole transport layer
- CBP, BAlq, and TAZ which are frequently used as a host of the light emitting layer (EML)
- EML light emitting layer
- the HOMO energy level difference is about 0.6 eV or more and as much as 1.4 eV, and thus the energy barrier is high, so that the driving voltage increases and the luminous efficiency is difficult.
- Korean Patent No. 10-0454500 [Patent Document 1] has proposed an organic light emitting device in which a buffer layer is formed between a hole transport layer (HTL) and a light emitting layer (EML), and Korean Patent No. 10-0777099
- Patent Document 2 an organic light emitting device in which a barrier releasing layer is formed between a hole transport layer (HTL) and a light emitting layer (EML) is proposed.
- the hole injection layer HIL, the hole transport layer HTL, and the hole blocking layer HBL are essentially formed in order to implement the conventional high efficiency phosphorescent organic light emitting device PhOLED, and to the light emitting layer EML.
- a multilayer structure in which a buffer layer or a barrier relaxation layer is formed is manufactured.
- the manufacturing process is complicated as it involves a plurality of processes for forming each layer.
- the thickness is so thick that it is difficult to apply to a flexible display.
- the conventional multilayer structure is applied to a blue phosphorescent organic light emitting diode (PhOLED)
- it is difficult to have high device characteristics and long life characteristics because it is not suitable for blue characteristics. In particular, it may not have high device characteristics at low voltages.
- embodiments of the present invention to provide a blue phosphorescent organic light emitting device having a laminated structure that can be usefully used for flexible displays, such as a monolayer and a thin manufacturing process as a minimum laminated structure having excellent characteristics of the blue phosphor.
- the purpose is.
- a cathode formed on the electron transport layer is formed on the electron transport layer
- the difference between the work function of the anode and the HOMO energy level of the light emitting layer is less than 1.0 eV
- a blue phosphorescent organic light emitting device in which a difference between an LUMO energy level of the emission layer and an LUMO energy level of the electron transport layer is less than 1.0 eV.
- the difference between the work function of the anode and the HOMO energy level of the light emitting layer may be 0.1 to 0.9 eV, and the difference between the LUMO energy levels of the light emitting layer and the electron transport layer may also be 0.1 to 0.9 eV.
- the anode preferably includes tungsten oxide (WO 3 ).
- the manufacturing process is simple and the thickness is thin due to having a minimum laminated structure with excellent blue phosphorescent device characteristics.
- the thickness since the thickness is thin, the flexible characteristic may be improved, and thus may be usefully used for a flexible display.
- FIG. 1 is a schematic view showing a laminated structure of a blue phosphorescent organic light emitting diode (PhOLED) according to the prior art.
- FIG. 2 is a schematic view showing a laminated structure of a blue phosphorescent organic light emitting diode (PhOLED) according to a preferred embodiment of the present invention.
- PhOLED blue phosphorescent organic light emitting diode
- 3 to 6 are energy band diagrams of a blue phosphorescent organic light emitting diode (PhOLED) manufactured according to Examples and Comparative Examples of the present invention.
- PhOLED blue phosphorescent organic light emitting diode
- FIG. 7 and 8 are graphs illustrating device characteristic evaluation results of a blue phosphorescent organic light emitting diode (PhOLED) manufactured according to Examples and Comparative Examples of the present invention.
- FIG. 2 illustrates a laminated structure of a blue phosphorescent organic light emitting diode (PhOLED) according to a preferred embodiment of the present invention.
- PhOLED blue phosphorescent organic light emitting diode
- a blue phosphorescent organic light emitting diode may include an anode 20; An emission layer 30 (EML) formed on the anode 20; An electron transport layer (40, ETL) formed on the light emitting layer 30; And a cathode 50 formed on the electron transport layer 40 and the ETL.
- the hole injection layer HIL and the hole transport layer HTL are not formed between the anode 20 and the light emitting layer 30.
- the phosphorescent organic light emitting diode PhOLED has a minimum stacked structure in which the hole injection layer HIL and the hole transport layer HTL are excluded, the following two conditions are satisfied.
- the hole injection layer HIL and the hole transport layer HTL which are inevitably formed by satisfying the above two conditions, are excluded, but have excellent device characteristics.
- the device has excellent characteristics such as high luminance (cd / A) and good luminous efficiency (lm / W).
- the substrate 10 is not limited.
- the substrate 10 may have a supporting force, which may be selected from, for example, a glass substrate or a polymer substrate.
- the substrate 10 may be selected from polymer substrates in consideration of flexibility, and for example, a film including one or more resins selected from polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), and the like. Can be used.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PC polycarbonate
- the anode 20 is considered HOMO energy level with the light emitting layer 30.
- the anode 20 has a work function in which a difference from the HOMO energy level of the light emitting layer 30 is less than 1.0 eV.
- the difference between the work function of the anode 20 and the HOMO energy level of the light emitting layer 30 is 1.0 eV or more, it is difficult to have excellent device characteristics as the minimum laminated structure desired in the embodiment of the present invention.
- the hole injection layer HIL and the hole transport layer HTL may be excluded. It can be seen that the hole injection is maximized to have excellent device characteristics.
- the anode 20 may have a difference in HOMO energy level from the light emitting layer 30 close to 0.1 eV, and more specifically, 0.1 to 0.9 eV.
- the anode 20 may be determined according to the type of material constituting the light emitting layer 30, in particular, the type of the host, and preferably has a work function of 5.8 to 6.8 eV. When the anode 20 has a work function in the above range, the energy barrier with the light emitting layer 30 is minimized to maximize hole injection into the light emitting layer 30.
- the anode 20 has a difference in the HOMO energy level from the light emitting layer 30 is 1.0. If it is less than eV is not limited, preferably tungsten oxide (WO 3 ) May be included. Specifically, the anode 20 is tungsten oxide (WO) on the substrate 10 3 ) Is formed by depositing, or tungsten oxide (WO 3 ) May be formed by depositing a mixture of different conductive metal oxides. For example, the anode 20 is tungsten oxide (WO) 3 At least aluminum oxide (Al) 2 O 3 ) And zinc oxide (ZnO) and the like may be composed of a deposit further comprising one or more metal oxides. The tungsten oxide (WO 3 ), The work function is about 5.9 eV, and the energy barrier with the light emitting layer 30 is minimized, which is preferable for the embodiment of the present invention.
- tungsten oxide (WO 3 ) The work function is about 5.9 eV, and the energy barrier with the light emitting layer 30 is minimized,
- the light emitting layer 30 is not limited, and may be implemented blue phosphorescence.
- the light emitting layer 30 may include a host and a dopant capable of implementing blue phosphorescence.
- the host and dopant are not particularly limited, and these may be conventional ones.
- the host is not limited as long as it has a charge transfer ability, and is commonly used, for example, CBP [4,4′-N, N-dicarbazolebiphenyl], BAlq [bis (2-methyl-8-qui Nolinolato) (para-phenolato) aluminum (III)], TAZ [triazole], mCP [1,3-N, N-dicarbazolebenzene], SAlq [bis (2-methyl-8-quinolinola Earth) (triphenylsiloxy) aluminum (III)], p-EtTAZ [3- (biphenyl-4-yl) -5- (4-dimethylamino) 4- (4-ethylphenyl) -1,2, 4-triazole], p-TTA [tris (para-ter-phenyl-4-yl) amine] and BMB-2T [5,5-bis (dimethythylboryl) -2,2-bithiophene] and the like. You can use one or more selected.
- the dopant is commonly used, for example, one or more selected from FIr6, FIrpic, etc. may be used, and in addition to these, 4-dicyanomethylene-2-methyl-6- (para-dimethylaminostyryl)- 4H-pyran], dicyanomethylene-2-methyl-6- (zulolidin-4-yl-vinyl) -4H-pyran), dicyanomethylene-2-methyl-6- (1,1,7,7 -Tetramethylzulolidil-9-enyl) -4H-pyran), dicyanomethylene-2-tert-butylbutyl-6- (1,1,7,7-tetramethylzulolidil-9-enyl) -4H -Pyran) and dicyanomethylene-2-isopropyl-6- (1,1,7,7-tetramethylzololidyl-9-enyl) -4H-pyran) and the like.
- the light emitting layer 30 includes a host thin film layer 31 formed on the anode 20 and a phosphor layer 32 formed on the host thin film layer 31. It is good to include. As such, when the host thin film layer 31 is formed between the anode 20 and the phosphor layer 32, the host thin film layer 31 effectively transfers holes induced from the anode 20 to the phosphor layer 32. Transfer can improve device efficiency.
- the host thin film layer 31 is formed by coating a host on the anode 20.
- the host thin film layer 31 is not particularly limited, but may be formed, for example, in a thickness of 20 to 100 nm.
- the phosphor layer 32 may be formed on the host thin film layer 31 to have a thickness of, for example, 150 to 500 nm.
- the phosphor layer 32 consists of a mixture of host and dopant.
- the phosphor layer 32 may, for example, consist of a mixture of 5 to 25 mole percent dopant relative to the host. That is, the host and the dopant may be configured in a molar ratio of 100: 5 to 25.
- the host constituting the host thin film layer 31 and the host constituting the phosphor layer 32 are preferably the same material.
- the electron transport layer 40 is considered LUMO energy level. Specifically, as described above, the electron transport layer 40 has a LUMO energy level difference of less than 1.0 eV from the light emitting layer 30. As a result, the injection of electrons is effectively achieved, and the high efficiency of the minimum laminated structure is achieved. That is, electrons induced from the cathode 50 are effectively injected into the light emitting layer 30 without forming a separate electron injection layer EIL between the electron transport layer 40 and the cathode 50, thereby providing a minimal stacked structure. It has high efficiency device characteristics.
- the LUMO energy level difference between the light emitting layer 30 and the electron transport layer 40 is preferably 0.1 to 0.9 eV.
- the blocking of the holes is simultaneously satisfied with the effective injection of electrons, resulting in high efficiency device characteristics. That is, not only the injection of electrons is good but also the holes are effectively prevented from being transferred to the cathode 50 without forming a separate hole blocking layer HBL between the light emitting layer 30 and the cathode 50. While having a structure, high efficiency is achieved.
- the LUMO energy level difference between the light emitting layer 30 and the electron transport layer 40 is less than 0.1 eV (for example, when the LUMO energy level difference is 0.0eV), it is difficult to achieve effective hole blocking and blocking the holes. Formation of layer HBL may be inevitable. In the case of 0.9 eV or less, electron injection into the light emitting layer 30 is better.
- the electron transport layer 40 is not limited as long as the difference in LUMO energy level from the light emitting layer 30 is less than 1.0 eV.
- the LUMO energy level (normal negative value) measured according to a conventional energy level measurement method is 2.4.
- Compounds that are from 3.2 eV can be used.
- the electron transport layer 40 may use a compound having an LUMO energy level of 2.9 to 3.1 eV (3.0 ⁇ 0.1 eV). This is particularly the case when FIr6 is used as the blue phosphorescent dopant of the light emitting layer 30.
- injection of electrons and blocking of holes are maximized to have excellent device characteristics of high efficiency.
- the electron transport layer 40 may include at least one selected from the compounds represented by Formula 1 and Formula 2 below.
- R 'and R are the same as or different from each other and are selected from hydrogen, aliphatic compounds and aromatic compounds.
- R' and R" are specifically hydrogen; C1-C20 alkyl group; C6 ⁇ C20 aryl group; C3 ⁇ C20 heteroaryl group; C3-C20 heteroaryl substituted alkyl group; And an aryl group substituted with C1 to C20 alkyl or C3 to C20 heteroaryl.
- R 'and R may be selected from an alkyl group (methyl group, ethyl group, propyl group and butyl group, etc.) or a phenyl group.
- the LUMO energy level is in the range of 2.4 to 3.2 eV, they are LUMO energy level, as well as HOMO energy level is not different from the light emitting layer 30, the implementation of the present invention This is useful for example.
- the electron transport layer 40 preferably, at least contains the compound represented by the formula (2).
- the electron transport layer 40 is composed of a compound of formula (2), or a compound of formula (1) is preferably mixed with the compound of formula (2).
- the cathode 50 is not limited, which may be used conventional.
- the cathode 50 may be selected from metals.
- the negative electrode 50 may include, for example, one or two or more alloys selected from Al, Ca, Mg, Ag, and the like, and preferably may be coated with LiF on Al or an alloy including Al.
- each of the layers is not limited.
- each of the above layers may be formed in the same manner as usual, for example, vacuum deposition such as sputtering, drying after liquid coating, or baking after coating, and the method of formation is not limited.
- the blue phosphorescent organic light emitting diode (PhOLED) according to the embodiment of the present invention described above has excellent device characteristics.
- the electron injection layer EIL and / or the hole blocking layer HBL, as well as the hole injection layer HIL and the hole transport layer HTL, which are conventionally formed inevitably, are excluded to have a minimum laminated structure.
- the manufacturing process is simple and the thickness is thin due to the minimum laminated structure, it may be usefully used for a flexible display.
- the host constituting the light emitting layer 30 preferably includes a compound described below.
- the host described below has a high triplet energy of 3.0 eV or more and is excellent in charge mobility and thermal stability and thus is preferably applied to the embodiment of the present invention.
- the host constituting the light emitting layer 30 is preferably used having a structure in which a carbazole compound is bonded around the central atom.
- the central atom is selected from the Group 14 element, the carbazole compound is bonded to two or three around the central group 14 element.
- the carbazole compound has a structure in which one or more alkyl groups (C n H 2n + 1 ⁇ ) are substituted in a molecule.
- the central atom is preferably selected from Si (silicon), Ge (germanium) or C (carbon), and more preferably from Si or Ge.
- 'carbazole' is generally named, which means that two 6-membered benzene rings are bonded to both sides of a 5-membered ring including nitrogen (see Formula 4 below).
- the 'carbazole compound' means a carbazole compound including at least one carbazole in a molecule. That is, in embodiments of the present invention, the carbazole compound may include one or two or more carbazoles in a molecule, and may further include other compounds optionally in addition to the carbazole. Specifically, the carbazole compound may have one carbazole in the molecule or two or more carbazoles. And in addition to carbazole, other compounds may include, for example, arylene (benzene ring, etc.), heterocycles, and the like. In addition, the carbazole compound has a structure in which at least one alkyl group (C n H 2n + 1 ⁇ ) is substituted. In this case, the alkyl group is substituted with carbazole.
- the carbazole compound has a structure in which at least one alkyl group (C n H 2n + 1 ⁇ ) is substituted. In this case, the alkyl group is substituted with carbazole.
- the carbazole compound includes at least one carbazole in a molecule as defined above, and the carbazole has a structure in which at least one alkyl group is substituted.
- the alkyl group is preferably substituted with a benzene ring of carbazole.
- the carbazole has two benzene rings as described above, wherein the alkyl group may be substituted with at least one (either one or both) of the two benzene rings.
- One benzene ring may be substituted with one or more alkyl groups.
- the alkyl group is not limited. That is, the carbon number of the alkyl group is not limited.
- the alkyl group may be selected from, for example, an alkyl group of C1 to C20.
- the alkyl group may be selected from, for example, methyl group, ethyl group, propyl group, butyl group, and the like, but is not limited thereto.
- the propyl group includes n-propyl group and i-propyl group, and the butyl group is n-butyl group. group), i-butyl group (iso-butyl group) and t-butyl group (tertiary-butyl group).
- two or three carbazole compounds are bonded around the central atom, wherein the two or three carbazole compounds may be the same or different from each other.
- M is a group 14 element as a central atom.
- M is preferably Si, Ge or C as described above.
- n is 2 or 3 as a natural number, and R1 includes carbazole in which one or more alkyl groups are substituted as a carbazole compound.
- R 2 is not limited.
- R 2 may be selected from hydrogen, aliphatic compounds, aromatic compounds and the like.
- R2 may be a heterocyclic compound as an aliphatic compound.
- R 2 may be specifically selected from hydrogen, an alkyl group, an alkoxy group, a cycloalkyl group, an alkoxycarbonyl group, an aryl group, an aryloxy group, and the like.
- R2 may be, for example, a ring compound in which two or more alkyl groups and the like are formed with each other in a ring.
- the R2 is C1 ⁇ C20 Alkyl group; C6 ⁇ C20 aryl group; C3 ⁇ C20 heteroaryl group; C3-C20 heteroaryl substituted alkyl group; And an aryl group substituted with C1 to C20 alkyl or C3 to C20 heteroaryl.
- the host is to use a compound represented by the following formula (4).
- the central atom M is a Group 14 element, preferably Si or Ge.
- R11 to R17 may be each independently the same as or different from each other, and are selected from alkyl groups.
- R11 to R17 is an alkyl group
- carbon number is not limited, for example, may be selected from an alkyl group of C1 ⁇ C20.
- R11 to R17 may be selected from, for example, methyl group, ethyl group, propyl group, butyl group, and the like, but are not limited thereto.
- the propyl group includes n-propyl group and i-propyl group, and the butyl group is n-butyl group. group), i-butyl group (iso-butyl group) and t-butyl group (tertiary-butyl group). More preferably, R11 to R17 are all methyl groups.
- the host described above is useful as the light emitting layer 30 in the embodiment of the present invention because it has high triplet energy (ET) and excellent electrical characteristics such as charge mobility and thermal stability.
- the host as described above has a high triplet energy (ET ⁇ 3.0 eV) of at least 3.0 eV.
- a high triplet energy (ET ⁇ 3.0 eV) of at least 3.0 eV.
- M central atom
- R1 carbazole compound
- Tg high thermal stability
- it is applied to a blue organic light emitting diode (PhOLED) according to an embodiment of the present invention, to realize a high luminous efficiency with dark blue.
- a WO 3 thin film having a work function of 5.9 eV as an anode was deposited on a PET substrate, and then an emission layer EML was formed on the anode WO 3 , and an electron transport layer ETL was formed thereon. Then, LiF / Al was sequentially formed as an anode on the electron transport layer (ETL).
- the electron transport layer (ETL) was formed to a thickness of 400nm using a compound represented by the formula (1) in which both R 'and R "is -CH 3 in Formula 1.
- the light emitting layer (EML) is an anode (WO) 3 )
- a host was first coated with a thickness of 50 nm, and then a phosphor layer composed of a mixture of 10 mole% of the host proportional dopant was formed to a thickness of 300 nm.
- Silver was an organic-inorganic complex compound which is a methyl group (-CH 3 ), the dopant was used FIr6.
- Example 2 The same procedure as in Example 1 was carried out except that the compound represented by Chemical Formula 2 (wherein R ′ and R ′′ in Formula 2 were both —CH 3 ) was used as the electron transport layer (ETL).
- ETL electron transport layer
- TAPC 300 nm
- HIL hole injection layer
- HTL hole transport layer
- EML emission layer
- the light emitting layer (EML) is composed of a mixture of 10 mole% of the host proportional dopant, the host used a conventional CBP, the dopant used FIr6.
- Example 1 but to form an electron transport layer (ETL) on the light emitting layer (EML), wherein the electron transport layer (ETL) in Example 1.
- ETL electron transport layer
- Example 1 The preparation of Example 1 and evaluate the same compound (R 'and R "in formula (1) are both -CH 3 It was formed to a thickness of 400nm, and LiF / Al as a cathode.
- PhOLED was manufactured in the same manner as before. Specifically, in contrast to Comparative Example 1, it was carried out in the same manner as in Comparative Example 1 except for using 3TPYMB which is commonly used as the electron transport layer (ETL).
- 3TPYMB which is commonly used as the electron transport layer (ETL).
- PhOLED according to an embodiment of the present invention has a hole injection layer (HIL) and a hole transport layer (HTL) in comparison with Comparative Example 2 according to the related art.
- HIL hole injection layer
- HTL hole transport layer
- a blue phosphorescent organic light emitting device having a laminated structure, which has excellent characteristics of a blue phosphorescent device and has a simple manufacturing process as a minimal laminated structure and a thin thickness, which can be usefully used for a flexible display.
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Abstract
Description
비 고 | 전압[V] | 전류밀도(@ 12V)[mA/㎠] | Max.Eff | CIE(x, y) | |
%(Cd/A) | lm/W | ||||
실시예 1 | 4.0 | 120.5 | 15.8(25.0) | 13.7 | (0.15, 0.22) |
실시예 2 | 3.0 | 500.0 | 13.8(23.0) | 13.5 | (0.15, 0.23) |
비교예 1 | 4.2 | 73.9 | 15.5(24.9) | 13.6 | (0.15, 0.22) |
비교예 2 | 4.0 | 70.2 | 12.7(21.2) | 11.4 | (0.15, 0.25) |
Claims (12)
- 양극;상기 양극 상에 형성되고, 호스트와 도판트를 포함하는 발광층;상기 발광층 상에 형성된 전자 수송층; 및상기 전자 수송층 상에 형성된 음극을 포함하고,상기 양극의 일함수(work function)와 발광층의 HOMO 에너지 레벨의 차이가 1.0eV 미만이며,상기 발광층의 LUMO 에너지 레벨과 전자 수송층의 LUMO 에너지 레벨의 차이가 1.0eV미만인 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항에 있어서,상기 양극의 일함수(work function)와 발광층의 HOMO 에너지 레벨의 차이가 0.1 내지 0.9 eV인 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항에 있어서,상기 양극의 일함수(work function)는 5.8 내지 6.8 eV인 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항에 있어서,상기 양극은 텅스텐 옥사이드(WO3)를 포함하는 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항에 있어서,상기 발광층의 LUMO 에너지 레벨과 전자 수송층의 LUMO 에너지 레벨의 차이가 0.1 내지 0.9 eV 인 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항에 있어서,상기 전자 수송층의 LUMO 에너지 레벨은 2.9 내지 3.1 eV인 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항에 있어서,상기 발광층은 양극 상에 형성된 호스트 박막층과;상기 호스트 박막층 상에 형성되고, 호스트와 도판트를 포함하는 인광 물질층을 포함하는 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 8 항에 있어서,상기 화학식 1 및 2의 R'와 R"는 알킬기 또는 페닐기인 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 1 항 내지 제 7 항 중 어느 하나의 항에 있어서,상기 호스트는,중심원자의 주변에 카바졸 화합물이 결합되고;상기 중심원자는 14족 원소이며;상기 중심원자의 주변에 결합된 카바졸 화합물은 2개 또는 3개이고;상기 카바졸 화합물은, 알킬기가 치환된 카바졸을 포함하는 것을 특징으로 하는 청색 인광 유기 발광소자.
- 제 10 항에 있어서,상기 호스트는, 하기 화학식 3으로 표시된 화합물인 것을 특징으로 하는 청색 인광 유기 발광소자.[화학식 3](R1)n-M-(R2)4-n(위 화학식 3에서,M은 14족 원소이고,n은 2 또는 3이며,R1은 카바졸에 알킬기가 치환된 카바졸 화합물이고,R2는 수소, 지방족 화합물 및 방향족 화합물로부터 선택된다.)
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2012
- 2012-06-29 WO PCT/KR2012/005210 patent/WO2013047981A1/ko active Application Filing
- 2012-06-29 JP JP2014528258A patent/JP5760281B2/ja active Active
- 2012-06-29 US US14/346,073 patent/US20140231786A1/en not_active Abandoned
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Publication number | Priority date | Publication date | Assignee | Title |
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CN111081888A (zh) * | 2018-10-22 | 2020-04-28 | 乐金显示有限公司 | 有机发光二极管和具有该发光二极管的有机发光装置 |
US11895915B2 (en) | 2018-10-22 | 2024-02-06 | Lg Display Co., Ltd | Organic light emitting diode and organic light emitting device having the same |
Also Published As
Publication number | Publication date |
---|---|
KR20130034287A (ko) | 2013-04-05 |
JP2014531746A (ja) | 2014-11-27 |
US20140231786A1 (en) | 2014-08-21 |
KR101301730B1 (ko) | 2013-08-30 |
JP5760281B2 (ja) | 2015-08-05 |
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