Organic light emitting device and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10825994-B2
Application number	US-201715552221-A
Country	US
Kind code	B2
Filing date	Jun 22, 2017
Priority date	Mar 16, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present invention relates to a display technical field, especially to an organic light emitting device which includes from the bottom to the top: a substrate, an anode layer, a hole injection layer, a hole transport layer, an exciton blocking layer, an organic light emitting layer, an electron transport layer, an electron injection layer and a cathode layer; the material of the organic light emitting layer includes benzimidazole derivative as illustrated in Formula 1,

wherein P1, P2 and P3 are benzene rings, and at least one of R 1 ˜R 12 is a substituent having hole transport ability. The present invention further provides preparing methods for the organic light emitting layer and device.

First claim

The invention claimed is:

1. An organic light emitting device, comprising from the bottom to the top: a substrate, an anode layer, a hole injection layer, a hole transport layer, an exciton blocking layer, an organic light emitting layer, an electron transport layer, an electron injection layer and a cathode layer; wherein the organic light emitting layer includes benzimidazole derivative as illustrated in Formula 1,

wherein P1, P2 and P3 are benzene rings, and at least one of R 1 -R 12 is a substituent having hole transport ability, and
wherein each of R 1 -R 12 is selected from the group consisting of a hydrogen group, a phenyl group, a p-tolyl, a biaza-9-carbazolyl, a triphenyl silyl, a p-triphenylamino, a 1-naphthalene substituted p-triphenylamino, a 2-naphthalene substituted p-triphenylamino, a 3,6-ditert-butyl carbazolyl phenyl, a di3,6-ditert-butyl carbazolyl phenyl, a p-triphenylamino, a 1-naphthalene substituted p-triphenylamino, a 2-naphthalene substituted p-triphenylamino, a 2-dibenzothiophene, a 3-dibenzothiophene, a 4-dibenzothiophene and a m-terphenyl.

2. The organic light emitting device of claim 1 , wherein the organic light emitting layer further includes a dopant which is bis(4,6-difluorophenylpyridinato-N, C2)picolinatoiridium, or bis(2-phenyl-benzothiazole-C2,N)(acetylacetonate)iridium (III); and the mass fraction that the dopant occupies the organic light emitting layer is 0.5-7 wt %.

3. The organic light emitting device of claim 2 , wherein the mass fraction that is the dopant bis(2-phenyl-benzothiazole-C2,N)(acetylacetonate)iridium (III)) occupies the organic light emitting layer is 0.5-5 wt %.

4. The organic light emitting device of claim 1 , wherein the material of the anode layer is a semiconductor conducting film; the material of the hole injection layer is molybdenum oxide; the material of the hole transport layer is N,N′-diphenyl-N,N′-(1-naphthyl)-1,1′-biphenyl-4,4′-diamine or 4,4′-cyclohexyl di[N,N′-di(4-methylphenyl)phenylamine]; the material of the exciton blocking layer is N,N′-dicarbazole-3,5-benzene or a 4,4′,4″-tris(carbazole-9-yl)triphenylamine; the material of the electron transport layer is 1,3,5-tris[(3-pyridinyl)-3-phenyl]benzene; the material of the electron injection layer is LiF; and the cathode layer is Al.

5. A preparing method for an organic light emitting device, comprising:
forming an anode layer on a substrate;
sequentially forming a hole injection layer, a hole transport layer and an exciton blocking layer on the anode layer using a vacuum thermal evaporation method;
forming an organic light emitting layer which comprises benzimidazole derivative as illustrated in Formula 1 on the exciton blocking layer using a vacuum thermal evaporation method,

wherein P1, P2 and P3 are benzene rings, and at least one of R 1 -R 12 is a substituent having hole transport ability, and
wherein each of R 1 -R 12 is selected from the group consisting of a hydrogen group, a phenyl group, a p-tolyl, a biaza-9-carbazolyl, a triphenyl silyl, a p-triphenylamino, a 1-naphthalene substituted p-triphenylamino, a 2-naphthalene substituted p-triphenylamino, a 3,6-ditert-butyl carbazolyl phenyl, a di3,6-ditert-butyl carbazolyl phenyl, a p-triphenylamino, a 1-naphthalene substituted p-triphenylamino, a 2-naphthalene substituted p-triphenylamino, a 2-dibenzothiophene, a 3-dibenzothiophene, a 4-dibenzothiophene and a m-terphenyl; and
forming an electron transport layer, an electron injection layer and a cathode layer on the organic light emitting layer using a vacuum thermal evaporation method.

6. The preparing method for an organic light emitting device of claim 5 , wherein the organic light emitting layer further comprises a dopant which is bis(4,6-difluorophenylpyridinato-N, C2)picolinatoiridium, or bis(2-phenyl-benzothiazole-C2,N)(acetylacetonate)iridium (III); and the mass fraction that the dopant occupies the organic light emitting layer is 0.5-7 wt %.

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd
• Wuhan China Star Optoelectronics Tech Ltd

Inventors

• Pan Biao

Classifications

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K85/6572

  comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• C07D235/18

  with aryl radicals directly attached in position 2 · CPC title

• C07D403/10

  linked by a carbon chain containing aromatic rings · CPC title