CN104167496B - 倒置式顶发射器件及其制备方法 - Google Patents
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 39
- FJDQFPXHSGXQBY-UHFFFAOYSA-L caesium carbonate Chemical group [Cs+].[Cs+].[O-]C([O-])=O FJDQFPXHSGXQBY-UHFFFAOYSA-L 0.000 claims abstract description 30
- 229910000024 caesium carbonate Inorganic materials 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 230000027756 respiratory electron transport chain Effects 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 21
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 claims description 18
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 claims description 14
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 11
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims description 9
- 239000004305 biphenyl Substances 0.000 claims description 8
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 8
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- 239000003513 alkali Substances 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- TZRXHJWUDPFEEY-UHFFFAOYSA-N Pentaerythritol Tetranitrate Chemical compound [O-][N+](=O)OCC(CO[N+]([O-])=O)(CO[N+]([O-])=O)CO[N+]([O-])=O TZRXHJWUDPFEEY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 6
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- ZSYMVHGRKPBJCQ-UHFFFAOYSA-N 1,1'-biphenyl;9h-carbazole Chemical group C1=CC=CC=C1C1=CC=CC=C1.C1=CC=C2C3=CC=CC=C3NC2=C1 ZSYMVHGRKPBJCQ-UHFFFAOYSA-N 0.000 claims description 5
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
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- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
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- 229910052750 molybdenum Inorganic materials 0.000 claims 1
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- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 abstract description 24
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- 229910001316 Ag alloy Inorganic materials 0.000 description 2
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- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
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- GEQBRULPNIVQPP-UHFFFAOYSA-N 2-[3,5-bis(1-phenylbenzimidazol-2-yl)phenyl]-1-phenylbenzimidazole Chemical compound C1=CC=CC=C1N1C2=CC=CC=C2N=C1C1=CC(C=2N(C3=CC=CC=C3N=2)C=2C=CC=CC=2)=CC(C=2N(C3=CC=CC=C3N=2)C=2C=CC=CC=2)=C1 GEQBRULPNIVQPP-UHFFFAOYSA-N 0.000 description 1
- PGMVMQKSOQOICN-UHFFFAOYSA-N 2-phenyl-1,5-dihydropyrazole Chemical class C1=CCNN1C1=CC=CC=C1 PGMVMQKSOQOICN-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明提供了一种倒置式顶发射器件,包括依次层叠的ITO/Ag/ITO基板、阴极、电子注入层、电子传输层、发光层、空穴传输层以及阳极,其中所述阴极的材料为碳酸铯。本发明所提供的倒置式顶发射器件及其制备方法,在现有ITO/Ag/ITO/HTL/EML/ETL/Mg:Ag结构的基础上,把器件结构改为:ITO/Ag/ITO/Cs2CO3/ETL/EML/HTL/MoO3/Ag,这样避免使用了低功函数金属Mg,在这种情况下,即便出现封装不理想的情况的,也可以保证器件不易受水氧氧化,从而保证获得较理想的器件寿命。
Description
技术领域
本发明属于有机电致发光器件(OLED)领域,具体涉及一种倒置式顶发射器件及其制备方法。
背景技术
最近几年,OLED的发展得到科研界和工业界的广泛关注,OLED显示屏已经步入人们的生活,但是它的寿命依然是存在的一个重要问题,如今的OLED器件一般采用高功函数的金属为阳极,低功函数的金属为阴极,但是低功函数的金属存在容易被氧化的问题,并且在封装中,一般封装面在低功函数处,器件密封显得尤为重要,即便如此,OLED器件的寿命依然很低。
有机发光二极管如今得到广泛的发展,在现行的工业化生产器件结构中,如图1所示,一般采用ITO/Ag/ITO为阳极,以低功函数的金属Mg和高功函数且化学性能比较稳定的金属Ag共蒸形成的Mg:Ag合金作为阴极的顶发射器件结构,然后再进行封装,其中ITO/Ag/ITO基板由前面Array段制程完成,然后进入OLED蒸镀段进行空穴注入层,空穴传输层,发光层,电子传输层,电子注入层等修饰层的蒸镀,最后进行阴极Mg:Ag合金的蒸镀,然后进行器件的封装。由于Mg为低功函数活泼金属,容易与水氧发生反应从而损坏器件阴极,使得OLED器件的使用寿命低下。
发明内容
本发明的目的在于提供一种倒置式顶发射器件及其制备方法,通过把器件结构改为:ITO/Ag/ITO/Cs2CO3/ETL/EML/HTL/MoO3/Ag,避免使用易氧化的Mg,从而解决了OLED器件的使用寿命低下的问题。
本发明所要解决的技术问题采用以下技术方案来实现:
一种倒置式顶发射器件,包括依次层叠的ITO/Ag/ITO基板、阴极层、电子传输层、发光层、空穴传输层以及阳极层,其中所述阴极的材料为碳酸铯。
优选地,所述阴极层中还掺杂碱金属盐,所述碱金属盐包括氟化铯、叠氮铯或者氟化锂。
优选地,碳酸铯的厚度为1nm至5nm。
优选地,所述电子传输层所用材料为1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯;所述发光层所用材料为:4,4'-N,N'-二咔唑联苯掺杂Ir(ppy)3;其中,Ir(ppy)3的掺杂比例为2%;所述空穴传输层所用材料为:N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺。
优选地,所述阳极层所用材料为:氧化钼/银。
优选地,所述电子传输层的厚度在30nm至35nm,所述发光层的厚度为35nm至40nm,所述空穴传输层的厚度为55nm至60nm,氧化钼的厚度在1nm至20nm,银的厚度为10nm至20nm。
一种倒置式顶发射器件的制备方法,包括以下步骤:(1)制作ITO/Ag/ITO基板;(2)在ITO/Ag/ITO基板上以碳酸铯为材料制作阴极层;(3)在所述阴极层上依序形成电子传输层、发光层、以及空穴传输层;(4)在所述空穴传输层上形成阳极层。
优选地,在步骤(1)中,所述ITO/Ag/ITO基板先用洗洁精、去离子水超声清洗,然后干燥处理后备用;在步骤(2)中,所述碳酸铯以蒸镀的方式蒸镀在所述备用的ITO/Ag/ITO基板上,所述碳酸铯的厚度为1nm至5nm;所述阴极层中还掺杂碱金属盐,所述碱金属盐包括氟化铯、叠氮铯或者氟化锂。
优选地,,在步骤(3)中,所述电子传输层的材料为:1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯;所述电子传输层的厚度为30nm至35nm;所述发光层材料为:4,4'-N,N'-二咔唑联苯掺杂Ir(ppy)3,其中Ir(ppy)3的掺杂比例为2%;所述发光层的厚度为35nm至40nm;所述空穴传输层材料为:N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺;所述空穴传输层的厚度为55nm至60nm。
优选地,在步骤(4)中,所述阳极层材料为氧化钼/银;其中,氧化钼的厚度在1nm至20nm,银的厚度为10nm至20nm。
本发明所提供的倒置式顶发射器件及其制备方法,在现有ITO/Ag/ITO/HTL/EML/ETL/Mg:Ag结构的基础上,把器件结构改为:ITO/Ag/ITO/Cs2CO3/ETL/EML/HTL/MoO3/Ag,这样避免使用了低功函数金属Mg,在这种情况下,即便出现封装不理想的情况的,也可以保证器件不易受水氧氧化,从而保证获得较理想的器件寿命。
附图说明
图1为现有技术顶发射器件的结构示意图;
图2为本发明倒置式顶发射器件的结构示意图;以及
图3为本发明倒置式顶发射器件的制备流程图。
具体实施方式
为利于对本发明的结构的了解,以下结合附图及实施例进行说明。
图2为本发明倒置式顶发射器件的结构示意图。
结合图2所示,一种倒置式顶发射器件,包括依次层叠的ITO/Ag/ITO基板10、阴极层20、电子传输层30、发光层40、空穴传输层50以及阳极60,其中所述阴极层20的材料为碳酸铯。
其中,ITO/Ag/ITO基板10为多层复合薄膜结构,利用透明导电ITO和高反射、高电导的金属Ag多层复合而成,该ITO/Ag/ITO基板10顺次包括内层ITO薄膜、银膜以及外层ITO薄膜,由于银易氧化,将银膜夹持于两层ITO薄膜之间,该银膜的一面附着在内层ITO薄膜上,并由外层ITO薄膜充当银膜的另一面的保护层,所以能够避免氧化的发生。
阴极层20采用的是碳酸铯(Cs2CO3),由于碳酸铯的电子注入原理为在阴极处形成偶极层,因此能够实现较好的电子注入,同样,碳酸铯蒸镀在ITO上,从而降低ITO的功函数而获得理想的电子注入性能,且这里我们利用碳酸铯蒸镀在ITO/Ag/ITO基板10上作为器件的阴极层20,这样可以避免使用低功函数金属Mg,从而减少水氧的侵蚀,提高使用寿命。在本实施例中,碳酸铯的厚度为1nm至5nm,优选厚度为3nm。
进一步地,阴极层20中还掺杂碱金属盐,以供作为阴极层的电子注入材料,该碱金属盐选自氟化铯(CsF)、叠氮铯(CsN3)或者氟化锂(LiF),本实施例优选为LiF;电子注入层的厚度为0.5nm至10nm,优选厚度为1nm;
电子传输层30所用材料英文缩写为TPBI,其全称为:1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯。
发光层所用材料40为:4,4'-N,N'-二咔唑联苯(CBP)掺杂Ir(ppy)3;其中,Ir(ppy)3的掺杂比例为2%。
本实施例中,Ir(ppy)3为一种磷光配合物,其中文名称为:磷光染料三(2-苯基吡啶)铱,具体为一种发光性能好的发光材料。
空穴传输层50所用材料为:
N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺。
阳极60所用材料为:MoO3/Ag,该材料中文名称为氧化钼/银。具体为一种复合薄膜层:在氧化钼薄膜上附着一层银膜。
本实施例中,电子传输层的厚度在30nm至35nm,所述发光层的厚度为35nm至40nm,所述空穴传输层的厚度为55nm至60nm,MoO3的厚度在1nm至20nm,银的厚度为10nm至20nm。作为一最佳实施例,优选电子传输层30的厚度为30nm,发光层40的厚度为40nm,空穴传输层50的厚度为60nm,MoO3的厚度为10nm,Ag的厚度为15nm。
图3为本发明倒置式顶发射器件的制备流程图。
如图3所示,上述倒置式顶发射器件的制备方法,包括如下步骤:
S1、制作ITO/Ag/ITO基板;
本实施例中,优选用洗洁精、先去离子水超声清洗ITO/Ag/ITO基板,然后干燥处理后备用。
S2、在ITO/Ag/ITO基板上以碳酸铯为材料制作阴极层;
本实施例中,以蒸镀的方式将碳酸铯蒸镀在ITO/Ag/ITO基板上,并掺杂CsF,LiF碱金属盐作为电子注入材料,所述碳酸铯的厚度为1nm至5nm,进一步地,优选碳酸铯厚度为5nm。
进一步地,阴极层中还掺杂碱金属盐,以供作为阴极层的电子注入材料,该碱金属盐选自氟化铯(CsF)、叠氮铯(CsN3)或者氟化锂(LiF),本实施例优选为LiF;电子注入层的厚度为0.5nm至10nm,优选厚度为1nm;
S3、在所述阴极层上依序形成电子传输层、发光层、以及空穴传输层;
具体地,电子传输层、发光层、以及空穴传输层以蒸镀的方式层叠,其中电子传输层材料为:1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯;所述电子传输层的厚度为30nm至35nm;
发光层材料为:4,4'-N,N'-二咔唑联苯掺杂Ir(ppy)3,其中Ir(ppy)3的掺杂比例为2%;所述发光层的厚度为35nm至40nm;
空穴传输层材料为:N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺;所述空穴传输层的厚度为55nm至60nm。
S4在所述空穴传输层上形成阳极层。
本实施例中,蒸镀MoO3/Ag作为阳极,其中,MoO3的厚度在1-20 nm之间,Ag的厚度为10-20nm左右;
下面结合图1和图2,对本发明的较佳实施例作进一步详细说明。
如图1和图2所示:分别为现有技术所用器件结构和改进后的器件结构。在这两种器件结构中,其中空穴传输材料HTL为N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺,发光层为4,4'-N,N'-二咔唑联苯(CBP)掺杂Ir(ppy)3,其中客体的掺杂比例为2%,电子传输层为1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯。由于我们主要设计的是器件的阴阳极结构,因此,除阴阳极外的其他层的材料选取不是唯一的,现有技术中常用的材料都可以进行置换。在倒置的器件结构中,Cs2CO3的厚度在1-5nm左右,此处优选Cs2CO3的厚度为3nm,Cs2CO3是一种有效的电子注入材料,广泛应用在正装OLED器件中,由于其电子注入原理为在阴极处形成偶极层,因此能够实现较好的电子注入,同样,它也可以蒸镀在ITO上,从而降低ITO的功函数而获得理想的电子注入性能,因此这里我们以ITO/Ag/ITO/Cs2CO3作为器件的阴极,这样可以避免使用低功函数金属Mg,从而减少水氧的侵蚀,提高寿命,在两种器件结构中,ETL的厚度为30nm,EML的厚度为40nm,HTL的厚度为60nm,MoO3的厚度优选为10nm,Ag的厚度优选为15nm。进一步地,出光面选为MoO3/Ag面,因为MoO3在可见光区域吸收比较少,因此不会对出光率造成较大的影响。
本发明所提供的倒置式顶发射器件及其制备方法,在现有ITO/Ag/ITO/HTL/EML/ETL/Mg:Ag结构的基础上,把器件结构改为:ITO/Ag/ITO/Cs2CO3/ETL/EML/HTL/MoO3/Ag,这样避免使用了低功函数金属Mg,在这种情况下,即便出现封装不理想的情况的,也可以保证器件不易受水氧氧化,从而保证获得较理想的器件寿命。
以上结合附图实施例对本发明进行了详细说明,本领域中普通技术人员可根据上述说明对本发明做出种种变化例。因而,实施例中的某些细节不应构成对本发明的限定,本发明将以所附权利要求书界定的范围作为保护范围。
Claims (7)
1.一种倒置式顶发射器件,其特征在于,包括依次层叠的ITO/Ag/ITO基板、阴极层、电子传输层、发光层、空穴传输层以及阳极层,其中所述阴极层的材料为碳酸铯,碳酸铯的厚度为1nm至5nm,所述阴极层中还掺杂碱金属盐,所述碱金属盐包括氟化铯、叠氮铯或者氟化锂,所述阳极层材料为氧化钼层及银层。
2.根据权利要求1所述的倒置式顶发射器件,其特征在于,所述电子传输层所用材料为1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯;
所述发光层所用材料为:4,4'-N,N'-二咔唑联苯掺杂Ir(ppy)3;
其中,Ir(ppy)3的掺杂比例为2%;
所述空穴传输层所用材料为:
N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺。
3.根据权利要求1所述的倒置式顶发射器件,其特征在于,所述电子传输层的厚度在30nm至35nm,所述发光层的厚度为35nm至40nm,所述空穴传输层的厚度为55nm至60nm,氧化钼的厚度在1nm至20nm,银的厚度为10nm至20nm。
4.一种倒置式顶发射器件的制备方法,包括以下步骤:
(1)制作ITO/Ag/ITO基板;
(2)在ITO/Ag/ITO基板上以碳酸铯为材料制作阴极层,所述碳酸铯的厚度为1nm至5nm;所述阴极层中还掺杂碱金属盐,所述碱金属盐包括氟化铯、叠氮铯或者氟化锂;
(3)在所述阴极层上依序形成电子传输层、发光层、以及空穴传输层;
(4)在所述空穴传输层上形成阳极层,所述阳极层材料为氧化钼层及银层。
5.根据权利要求4所述倒置式顶发射器件的制备方法,其特征在于,在步骤(1)中,所述ITO/Ag/ITO基板先用洗洁精、去离子水超声清洗,然后干燥处理后备用;
在步骤(2)中,所述碳酸铯以蒸镀的方式蒸镀在所述备用的ITO/Ag/ITO基板上。
6.根据权利要求4所述倒置式顶发射器件的制备方法,其特征在于,在步骤(3)中,
所述电子传输层的材料为:
1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯;所述电子传输层的厚度为30nm至35nm;
所述发光层材料为:
4,4'-N,N'-二咔唑联苯掺杂Ir(ppy)3,其中Ir(ppy)3的掺杂比例为2%;所述发光层的厚度为35nm至40nm;
所述空穴传输层材料为:
N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺;所述空穴传输层的厚度为55nm至60nm。
7.根据权利要求5所述倒置式顶发射器件的制备方法,其特征在于,在步骤(4)中,所述氧化钼层的厚度在1nm至20nm,银层的厚度为10nm至20nm。
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