Light-emitting element, light-emitting device, electronic device, and lighting device

Patent metadata

Field	Value
Publication number	US-11043637-B2
Application number	US-201815999406-A
Country	US
Kind code	B2
Filing date	Aug 20, 2018
Priority date	Aug 3, 2012
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

A light-emitting element having a long lifetime is provided. A light-emitting element exhibiting high emission efficiency in a high luminance region is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains a first organic compound, a second organic compound, and a phosphorescent compound. The first organic compound is represented by a general formula (G0). The molecular weight of the first organic compound is greater than or equal to 500 and less than or equal to 2000. The second organic compound is a compound having an electron-transport property. In the general formula (G0), Ar1 and Ar2 each independently represent a fluorenyl group, a spirofluorenyl group, or a biphenyl group, and Ar3 represents a substituent including a carbazole skeleton.

First claim

The invention claimed is:

1. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and a phosphorescent compound,
a first layer between the anode and the light-emitting layer,
a second layer between the cathode and the light-emitting layer,
wherein the first layer comprises a third organic compound represented by General Formula (G0),

wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, or a substituted or unsubstituted biphenyl group,
wherein Ar 3 represents a substituent including a 9 aryl-9H-carbazol-3-yl skeleton, and
wherein the aryl group of the 9-aryl-9H-carbazol-3-yl skeleton represents an unsubstituted phenyl group or a phenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted biphenyl group or a biphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms, an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms.

2. The light-emitting element according to claim 1 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.

3. The light-emitting element according to claim 1 ,
wherein the first layer further comprises an acceptor, and
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.

4. The light-emitting element according to claim 1 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000, and
wherein the second layer comprises a heteroaromatic compound.

5. The light-emitting element according to claim 1 ,
wherein the first layer further comprises an acceptor,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000, and
wherein the second layer comprises a heteroaromatic compound.

6. The light-emitting element according to claim 1 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission spectrum of the exciplex overlaps with an adsorption band of the phosphorescent compound which is located on the longest wavelength side.

7. The light-emitting element according to claim 1 ,
wherein the third organic compound is represented by General Formula (G1),

wherein a represents a substituted or unsubstituted phenylene group or a substituted or unsubstituted biphenyldiyl group,
wherein n represents 0 or 1, and
wherein A represents a substituted or unsubstituted 3-carbazolyl group.

8. The light-emitting element according to claim 1 ,
wherein the third organic compound represents Formula (128),

9. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and a phosphorescent compound,
a first layer between the anode and the light-emitting layer,
a second layer between the cathode and the light-emitting layer,
wherein the first layer comprises a third organic compound represented by General Formula (G0),

wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, or a substituted or unsubstituted biphenyl group,
wherein Ar 3 represents a substituent including a carbazole skeleton, and
wherein a triplet excitation energy level of each of the first organic compound and the second organic compound is higher than a triplet excitation energy level of the phosphorescent compound.

10. The light-emitting element according to claim 9 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.

11. The light-emitting element according to claim 9 ,
wherein the first layer further comprises an acceptor,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.

12. The light-emitting element according to claim 9 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000, and
wherein the second layer comprises a heteroaromatic compound.

13. The light-emitting element according to claim 9 ,
wherein the first layer further comprises an acceptor,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000, and
wherein the second layer comprises a heteroaromatic compound.

14. The light-emitting element according to claim 9 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission spectrum of the exciplex overlaps with an adsorption band of the phosphorescent compound which is located on the longest wavelength side.

15. The light-emitting element according to claim 9 ,
wherein the third organic compound is represented by General Formula (G1),

wherein α represents a substituted or unsubstituted phenylene group or a substituted or unsubstituted biphenyldiyl group,
wherein n represents 0 or 1, and
wherein A represents a substituted or unsubstituted 3-carbazolyl group.

16. The light-emitting element according to claim 9 ,
wherein the third organic compound represents Formula (128),

Assignees

• Semiconductor Energy Lab

Inventors

• Hamada Takao
• Seo Hiromi
• Abe Kanta
• Takeda Kyoko
• Seo Satoshi

Classifications

• C09K2211/1007

  Non-condensed systems · CPC title

• C09K2211/185

  of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd · CPC title

• H10K85/342

  comprising iridium · CPC title

• H10K85/633 Primary

  comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom · CPC title

• H10K85/631 Primary

  Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine · CPC title