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

Patent metadata

Field	Value
Publication number	US-11968889-B2
Application number	US-202117345430-A
Country	US
Kind code	B2
Filing date	Jun 11, 2021
Priority date	Aug 3, 2012
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

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 (GO). 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 (GO), 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 an iridium complex between the anode and the cathode,
a first layer on the anode,
wherein the first layer comprises an acceptor substance and a third organic compound represented by General Formula (G0),

wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted biphenyl group,
wherein a substituent of the substituted biphenyl group represents any one of an alkyl group having 1 to 10 carbon atoms, 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, and an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms,
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 organic compound and the second organic compound form an exciplex, and
wherein an emission peak of the exciplex overlaps with an absorption band on a longest wavelength in an absorption spectrum of the iridium complex.

4. The light-emitting element according to claim 3 ,
wherein the second organic compound comprises a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a quinoline skeleton, a pyrimidine skeleton, a pyrazine skeleton, a pyridine skeleton, a diazole skeleton, or a triazole skeleton.

5. The light-emitting element according to claim 1 ,
wherein the acceptor substance comprises a halogen compound, a cyano compound, and a transition metal oxide, and an oxide of a metal belonging to Groups 4 to 8 of the periodic table.

6. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and an iridium complex between the anode and the cathode,
a first layer on the anode,
wherein the iridium complex has an emission peak at 520 nm to 600 nm,
wherein the first layer comprises an acceptor and a third organic compound represented by General Formula (G0),

wherein Ar 1 and Ar 2 each independently represent a substituted or unsubstituted biphenyl group,
wherein a substituent of the substituted biphenyl group represents any one of an alkyl group having 1 to 10 carbon atoms, 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, and an unsubstituted terphenyl group or a terphenyl group having as a substituent at least one alkyl group having 1 to 10 carbon atoms,
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.

7. The light-emitting element according to claim 6 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.

8. The light-emitting element according to claim 6 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission peak of the exciplex overlaps with an absorption band on a longest wavelength in an absorption spectrum of the iridium complex.

9. The light-emitting element according to claim 8 ,
wherein the second organic compound comprises a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a quinoline skeleton, a pyrimidine skeleton, a pyrazine skeleton, a pyridine skeleton, a diazole skeleton, or a triazole skeleton.

10. The light-emitting element according to claim 6 ,
wherein the acceptor substance comprises a halogen compound, a cyano compound, and a transition metal oxide, and an oxide of a metal belonging to Groups 4 to 8 of the periodic table.

11. A light-emitting element comprising:
an anode,
a cathode,
a light-emitting layer comprising a first organic compound, a second organic compound, and an iridium complex between the anode and the cathode,
a first layer on the anode,
a second layer between the first layer and the light-emitting layer,
wherein the first layer comprises an acceptor substance and a third organic compound represented by General Formula (G0),

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

12. The light-emitting element according to claim 11 ,
wherein the aromatic amine compound is a diamine.

13. The light-emitting element according to claim 11 ,
wherein a molecular weight of the third organic compound is greater than or equal to 500 and less than or equal to 2000.

14. The light-emitting element according to claim 11 ,
wherein the first organic compound and the second organic compound form an exciplex, and
wherein an emission p

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