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

• US 20140319492A1
• Filed: 04/24/2014
• Published: 10/30/2014
• Est. Priority Date: 04/26/2013
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Hiromi, Takahashi, Tatsuyoshi, Seo, Satoshi
• Granted Patent: US 10,043,982 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2101/90 Multiple hosts in the emissive layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/654 comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

Provided is a light-emitting element with high emission efficiency. The light-emitting element including a first electrode, a second electrode, and a layer containing an organic compound between the first electrode and the second electrode. The layer containing the organic compound includes a light-emitting layer at least containing a first organic compound, a second organic compound, and a fluorescent substance. The first organic compound has an electron-transport property. The second organic compound has a hole-transport property. The second organic compound has a triarylamine skeleton. At least one of three aryl groups in the triarylamine skeleton is a group including a p-biphenyl skeleton.

Claims

1. A light-emitting device comprising:

a light-emitting layer between a pair of electrodes, the light-emitting layer comprising a fluorescent substance, a first organic compound having an electron-transport property, and a second organic compound having a hole-transport property,

wherein;

the second organic compound is represented by formula (G1);

2. The light-emitting device according to claim 1, wherein the substituted or unsubstituted fluorenyl group is a substituted or unsubstituted fluoren-2-yl group.

3. The light-emitting device according to claim 1, wherein the second organic compound does not comprise a naphthalene skeleton.

4. The light-emitting device according to claim 1, wherein light emission emitted from the light-emitting device includes a delayed fluorescence.

5. An electronic device comprising the light-emitting device according to claim 1.

6. A lighting device comprising the light-emitting device according to claim 1.

7. A light-emitting device comprising:

a light-emitting layer between a pair of electrodes, the light-emitting layer comprising a fluorescent substance, a first organic compound having an electron-transport property, and a second organic compound having a hole-transport property,

wherein;

the second organic compound is represented by formula (G1);

8. The light-emitting device according to claim 7, wherein the substituted or unsubstituted fluorenyl group is a substituted or unsubstituted fluoren-2-yl group.

9. The light-emitting device according to claim 7, wherein the second organic compound does not comprise a naphthalene skeleton.

10. The light-emitting device according to claim 7, wherein light emission emitted from the light-emitting device includes a delayed fluorescence.

11. An electronic device comprising the light-emitting device according to claim 7.

12. A lighting device comprising the light-emitting device according to claim 7.

13. A light-emitting device comprising:

a light-emitting layer between a pair of electrodes, the light-emitting layer comprising a fluorescent substance, a first organic compound having an electron-transport property, and a second organic compound having a hole-transport property,

wherein;

the second organic compound is represented by formula (G1);

14. The light-emitting device according to claim 13, wherein the group represents any one of a substituted or unsubstituted p-biphenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, and a substituted or unsubstituted 4-(9-phenyl-9H-carbazol-3-yl)phenyl group.

15. The light-emitting device according to claim 14, wherein the substituted or unsubstituted fluorenyl group is a substituted or unsubstituted fluoren-2-yl group.

16. The light-emitting device according to claim 13, wherein the second organic compound does not comprise a naphthalene skeleton.

17. The light-emitting device according to claim 13, wherein light emission emitted from the light-emitting device includes a delayed fluorescence.

18. An electronic device comprising the light-emitting device according to claim 13.

19. A lighting device comprising the light-emitting device according to claim 13.