Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Device, and Lighting Device

Patent metadata

Field	Value
Publication number	US-2016351829-A1
Application number	US-201615166585-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A light-emitting element having high emission efficiency is provided. A light-emitting element which has high emission efficiency without using a rare metal as a light-emitting material is provided. A light-emitting element includes a first electrode, a second electrode, and a layer between the first electrode and the second electrode. The layer contains a first organic compound and a second organic compound. The second organic compound has a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group. The second organic compound further has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton. The aromatic hydrocarbon group is bonded to the carbazole skeleton. The aromatic hydrocarbon group is bonded to the benzofuropyrimidine skeleton or the benzothienopyrimidine skeleton. The first organic compound and the second organic compound can form an exciplex.

First claim

1 . A light-emitting element comprising:
a first electrode; a second electrode; and a layer between the first electrode and the second electrode, wherein the layer comprises a first organic compound and a second organic compound, wherein the second organic compound comprises a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group, wherein the second organic compound further comprises a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton, wherein the aromatic hydrocarbon group is bonded to the carbazole skeleton, wherein the aromatic hydrocarbon group is bonded to the benzofuropyrimidine skeleton or the benzothienopyrimidine skeleton, and wherein the first organic compound and the second organic compound form an exciplex.

2 . The light-emitting element according to claim 1 , wherein a 9-position of the carbazole skeleton is bonded to the aromatic hydrocarbon group.

3 . The light-emitting element according to claim 1 , wherein the aromatic hydrocarbon group comprises 6 to 60 carbon atoms.

4 . The light-emitting element according to claim 1 , wherein the aromatic hydrocarbon group comprises 6 to 13 carbon atoms.

5 . The light-emitting element according to claim 1 , wherein the aromatic hydrocarbon group comprises a biphenyldiyl group.

6 . The light-emitting element according to claim 5 , wherein the biphenyldiyl group is a 3,3′-biphenyldiyl group.

7 . The light-emitting element according to claim 1 , wherein the second organic compound is an organic compound represented by a structural formula (100),

8 . The light-emitting element according to claim 1 , wherein the second organic compound is an organic compound represented by a structural formula (200),

9 . The light-emitting element according to claim 1 , wherein the second organic compound has an electron-transport property and the first organic compound has a hole-transport property.

10 . The light-emitting element according to claim 1 , wherein the first organic compound is an aromatic amine.

11 . The light-emitting element according to claim 1 , wherein triplet excitation energy levels of the first organic compound and the second organic compound are higher than a triplet excitation energy level of the exciplex.

12 . The light-emitting element according to claim 1 , wherein light emission comprises a delayed fluorescence component.

13 . A lighting device comprising:
the light-emitting element according to claim 1 ; and a switch.

14 . A light-emitting device comprising:
the light-emitting element according to claim 1 ; and a unit configured to control the light-emitting element.

15 . A display device comprising:
the light-emitting element according to claim 1 in a display portion; and a unit configured to control the light-emitting element.

16 . An electronic device comprising:
the light-emitting element according to claim 1 ; and a switch.

17 . A light-emitting element comprising:
a first electrode; a second electrode; and a layer between the first electrode and the second electrode, wherein the layer comprises a first organic compound and a second organic compound, wherein the second organic compound comprises a carbazole skeleton and a substituted or unsubstituted bivalent aromatic hydrocarbon group, wherein the second organic compound further comprises a benzofuro[3,2-d]pyrimidine skeleton or a benzothieno[3,2-d]pyrimidine skeleton, wherein the aromatic hydrocarbon group is bonded to the carbazole skeleton, wherein the aromatic hydrocarbon group is bonded to the benzofuro[3,2-d]pyrimidine skeleton or the benzothieno[3,2-d]pyrimidine skeleton, and wherein the first organic compound and the second organic compound form an exciplex.

18 . The light-emitting element according to claim 17 , wherein a 4-position of the benzofuro[3,2-d]pyrimidine skeleton or the benzothieno[3,2-d]pyrimidine skeleton is bonded to the aromatic hydrocarbon group.

19 . The light-emitting element according to claim 17 , wherein a 4-position of the benzofuro[3,2-d]pyrimidine skeleton or the benzothieno[3,2-d]pyrimidine skeleton is bonded to the aromatic hydrocarbon group while the other positions are unsubstituted.

20 . The light-emitting element according to claim 17 , wherein a 9-position of the carbazole skeleton is bonded to the aromatic hydrocarbon group.

21 . The light-emitting element according to claim 17 , wherein the aromatic hydrocarbon group comprises 6 to 60 carbon atoms.

22 . The light-emitting element according to claim 17 , wherein the aromatic hydrocarbon group comprises 6 to 13 carbon atoms.

23 . The light-emitting element according to claim 17 , wherein the aromatic hydrocarbon group comprises a biphenyldiyl group.

24 . The light-emitting element according to claim 23 , wherein the biphenyldiyl group is a 3,3′-biphenyldiyl group.

25 . The light-emitting element according to claim 17 , wherein the second organic compound has an electron-transport property and the first organic compound has a hole-transport property.

26 . The light-emitting element according to claim 17 , wherein the first organic compound is an aromatic amine.

27 . The light-emitting element according to claim 17 , wherein triplet excitation energy levels of the first organic compound and the second organic compound are higher than a triplet excitation energy level of the exciplex.

28 . The light-emitting element according to claim 17 , wherein light emission comprises a delayed fluorescence component.

29 . A lighting device comprising:
the light-emitting element according to claim 17 ; and a switch.

30 . A light-emitting device comprising:
the light-emitting element according to claim 17 ; and a unit configured to control the light-emitting element.

31 . A display device comprising:
the light-emitting element according to claim 17 in a display portion; and a unit configured to control the light-emitting element.

32 . An electronic device comprising:
the light-emitting element according to claim 17 ; and a switch.

Assignees

• Semiconductor Energy Lab

Inventors

• Hosoumi Shunsuke
• Takahashi Tatsuyoshi
• Ishisone Takahiro
• Seo Satoshi

Classifications

• C07D491/048 Primary

  the oxygen-containing ring being five-membered · CPC title

• C09K2211/1048

  with oxygen · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• C07D495/04

  Ortho-condensed systems · CPC title