Light emitting element, light emitting device, and electronic device

Patent metadata

Field	Value
Publication number	US-9397308-B2
Application number	US-94648407-A
Country	US
Kind code	B2
Filing date	Nov 28, 2007
Priority date	Dec 4, 2006
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

The present invention provides a light emitting element which includes an electron transporting layer and a hole transporting layer between an anode and a cathode, and a first layer and a second layer between the electron transporting layer and the hole transporting layer, wherein the first layer includes a first organic compound and an organic compound having a hole transporting property, the second layer includes a second organic compound and an organic compound having an electron transporting property, the first layer is formed in contact with the anode side of the second layer, the first organic compound and the second organic compound are the same compound, and at least one of either the organic compound having a hole transporting property and the organic compound having an electron transporting property is a high molecular compound.

First claim

What is claimed is:

1. A light emitting device comprising:
an anode;
a light emitting layer over the anode, the light emitting layer comprising:
a first layer; and
a second layer over the first layer; and

a cathode over the second layer,
wherein the first layer includes a first organic compound and a polymer having a hole transporting property,
wherein the second layer includes a second organic compound and an organic compound having an electron transporting property,
wherein the first organic compound and the second organic compound are the same as each other and are selected from 4-(9H-carbazol-9-yl)-4′-(10-phenyl-9-anthryl)triphenylamine,4,4′-(2-tert-butylanthracen-9,10-diyl)bis{N-[4-(9H-carbazol-9-yl)phenyl]-N-phenylaniline}, N,9-diphenyl-N-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazol-3-amine,N,N″-(2-tert-butylanthracene-9,10-diyldi-4,1-phenylene)bis[N,N′,N′-triphenyl-1,4-phenylenediamine],N,N′-bis[4-(9H-carbazol-9-yl)phenyl]-N,N′-diphenylstilbene-4,4′-diamine, N-[4-(9H-carbazol-9-yl)phenyl]-N-phenylstilbene-4-amine, and N,N′-diphenyl-N,N′-bis(9-phenylcarbazol-3-yl)stilbene-4,4′-diamine.

2. A light emitting device according to claim 1 further comprising:
a hole transporting layer between the anode and the first layer and an electron-transporting layer between the cathode and the second layer.

3. A light emitting device according to claim 1 , wherein the polymer is selected from poly(N-vinylcarbazole), poly(4-vinyltriphenylamine), poly[N-(4-{N′-[4-(4-diphenylamino)phenyl]phenyl-N′-phenylamino}phenyl)methacrylamide], and poly[N,N′-bis(4-butylphenyl)-N,N-′bis(phenyl)benzidine.

4. A light emitting device according to claim 1 , wherein the organic compound having the electron transporting property is selected from 9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole,3,6-diphenyl-9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole,9,10-bis(3,5-diphenylphenyl)anthracene,9,10-di(2-naphthyl)anthracene,2-tert-butyl-9,10-di(2-naphthyl)anthracene,9,9′-bianthryl,9,9′-(stilben-3,3′-diyl)diphenanthrene,9,9′-(stilben-4,4′-diyl)diphenanthrene, and 3,3′,3″-(benzene-1,3,5-tripyrene.

5. A light emitting device according to claim 1 further comprising:
a controller for controlling light emission of the light emitting device.

6. A light emitting device according to claim 1 , wherein the light emitting device is a display portion.

7. A light emitting device comprising:
an anode;
a light emitting layer over the anode, the light emitting layer comprising:
a first layer; and
a second layer over the first layer; and

a cathode over the second layer,
wherein the first layer includes a first organic compound and a polymer having a hole transporting property,
wherein a highest occupied molecular orbital level of the polymer is greater than or equal to −6.0 eV and less than or equal to −5.0 eV, and a lowest unoccupied molecular orbital level of the polymer is greater than or equal to −3.0 eV and less than or equal to −2.0 eV,
wherein the second layer includes a second organic compound and an organic compound having an electron transporting property,
wherein a highest occupied molecular orbital level of the organic compound having the electron transporting property is greater than or equal to −6.0 eV and less than or equal to −5.0 eV, and a lowest unoccupied molecular orbital level of the organic compound having the electron transporting property is greater than or equal to −3.0 eV and less than or equal to −2.0 eV,
wherein the first organic compound and the second organic compound are the same as each other and are selected from 4-(9H-carbazol-9-yl)-4′-(10-phenyl-9-anthryl)triphenylamine,4,4′(2-tert-butylanthracen-9,10-diyl)bis{N-[4-(9H-carbazol-9-yl)phenyl]-N-phenylaniline},N,9-diphenyl-N-[4-(10-phenyl-9anthryl)phenyl]-9H-carbazol-3-amine,N,N″-(2-tert-butylanthracene-9,10-diyldi-4,1-phenylene)bis[N,N′,N′-triphenyl-1,4-phenylenediamine],N,N′-bis[4-(9H-carbazol-9-yl)phenyl]-N,N′-diphenylstilbene-4,4′-diamine,N-[4-(9H-carbazol-9-yl)phenyl]-N-phenylstilbene-4-amine, and N,N′-diphenyl-N,N′-bis(9-phenylcarbazol-3-yl)stilbene-4,4′-diamine.

8. A light emitting device according to claim 7 further comprising:
a hole transporting layer between the anode and the first layer and an electron-transporting layer between the cathode and the second layer.

9. A light emitting device according to claim 7 , wherein the polymer is selected from poly(N-vinylcarbazole), poly(4-vinyltriphenylamine), poly[N-(4-{N′-[4-(4-diphenylamino)phenyl]phenyl-N′-phenylamino}phenyl)methacrylamide], and poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine.

10. A light emitting device according to claim 7 , wherein the organic compound having the electron transporting property included in the second layer is selected from 9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole,3,6-diphenyl-9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole,9,10-bis(3,5-diphenylphenyl)anthracene,9,10-di(2-naphthyl)anthracene,2-tert-butyl-9,10-di(2-naphthyl)anthracene,9,9′-bianthryl,9,9′-(stilben-3,3′-diyl)diphenanthrene,9,9′-(stilben-4,4′-diyl)diphenanthrene, and 3,3′,3″-(benzene-1,3,5-triyl)tripyrene.

11. A light emitting device according to claim 7 further comprising:
a controller for controlling light emission of the light emitting device.

12. A light emitting device according to claim 7 , wherein the light emitting device is a display portion.

13. A light emitting device comprising:
an anode;
a light emitting layer over the anode, the light emitting layer comprising:
a first layer ; and
a second layer over the first layer; and

a cathode over the second layer,
wherein the first layer includes a first organic compound and a polymer having a hole transporting property,
wherein the second layer includes a second organic compound and an organic compound having an electron transporting property,
wherein a difference between a highest occupied molecular orbital level of the polymer and a highest occupied molecular orbital level of the organic compound having the electron transporting property is 0.3 eV or less,
wherein a difference between a lowest unoccupied molecular orbital level of the polymer and a lowest unoccupied molecular orbital level of the organic compound having the electron transporting property is 0.3 eV or less,
wherein the first organic compound and the second organic compound are the same as each other and are selected from 4-(9H-carbazol-9-yl)-4′-(10-phenyl-9-anthryl)triphenylamine,4,4′-(2-tert-butylanthracen-9,10-diyl)bis{N[4-(9H-carbazol-9-yl)phenyl]-N-phenylaniline},N,9-diphenyl-N-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazol-3-amine,N,N″-(2-tert-butylanthracene-9,10-diyldi-4,1-phenylene)bis[N,N′,N′-triphenyl-1,4-pylenediamine],N,N′-bis[4-(9H-carbazol-9-yl)phenyl]-N,N′-diphenyltilbene-4,4′-diamine,N-[4-(9H-carbazol-9-yl)phenyl]-N-phenylstilbene-4-amine, and N,N′-diphenyl-N,N′-bis(9-phenylcarbazol-3-yl)stilbene-4,4′-diamine.

14. A light emitting device according to claim 13 further comprising:
a hole transporting layer between the anode and the first layer and an electron-transporting layer between the cathode and the second layer.

15. A fight emitting device according to claim 13 , wherein the polymer is selected from poly(N-vinylcarbazole), poly(-vinyltriphenylamine), poly[N-(4-{N′-[4-(4-diphenylamino)phenyl]phenyl-N′-phenylamino}phenyl)methacrylamide], and poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine.

16. A light emitting device according to claim 13 , wherein the organic compound having the electron transporting property included in the second layer is selected from 9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole,3,6-diphenyl-

Assignees

• Seo Satoshi
• Ohsawa Nobuharu
• Semiconductor Energy Lab

Inventors

• Seo Satoshi
• Ohsawa Nobuharu

Classifications

• H01L51/5012

  Electricity · mapped topic

• H01L51/5008

  Electricity · mapped topic

• H01L51/5036

  Electricity · mapped topic

• H01L51/0043

  Electricity · mapped topic

• H01L51/5004 Primary

  Electricity · mapped topic