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

• US 20140034929A1
• Filed: 08/01/2013
• Published: 02/06/2014
• Est. Priority Date: 08/03/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Hamada, Takao, Seo, Hiromi, Takeda, Kyoko, Seo, Satoshi, Abe, Kanta
• Granted Patent: US 9,412,962 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: C07D 209/86 with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the ring system
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: H10K 2101/10 Triplet emission
• 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 50/12 comprising dopants
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/624 containing six or more rings
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/636 comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• 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

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.

Claims

1. A light-emitting element comprising, between a pair of electrodes:

a first organic compound;

a second organic compound; and

a phosphorescent compound,

wherein the first organic compound is represented by General Formula (G0),

2. The light-emitting element according to claim 1,

wherein the first organic compound is represented by General Formula (G1),

3. The light-emitting element according to claim 1 comprising, between the pair of electrodes:

a light-emitting layer,

wherein the first organic compound, the second organic compound, and the phosphorescent compound are included in the light-emitting layer.

4. The light-emitting element according to claim 1 comprising, between the pair of electrodes:

a light-emitting layer; and

a hole-transport layer in contact with the light-emitting layer,

wherein the first organic compound is included in the hole-transport layer.

5. The light-emitting element according to claim 1 comprising, between the pair of electrodes:

a light-emitting layer; and

a hole-transport layer in contact with the light-emitting layer,

wherein the first organic compound, the second organic compound, and the phosphorescent compound are included in the light-emitting layer, and

wherein the first organic compound is included in the hole-transport layer.

6. The light-emitting element according to claim 1,

wherein the Ar¹ and the Ar² each independently represent a substituted or unsubstituted 2-fluorenyl group, a substituted or unsubstituted spiro-9,9′

-bifluoren-2-yl group, or a biphenyl-4-yl group.

7. The light-emitting element according to claim 1, wherein a combination of the first organic compound and the second organic compound forms an exciplex.

8. A light-emitting device comprising the light-emitting element according to claim 1 in a light-emitting portion.

9. An electronic device comprising the light-emitting device according to claim 8 in a display portion.

10. A lighting device comprising the light-emitting device according to claim 8 in a light-emitting portion.

11. A light-emitting element comprising, between a pair of electrodes:

a first organic compound;

a second organic compound; and

a phosphorescent compound,

wherein the first organic compound is represented by General Formula (G2),

12. The light-emitting element according to claim 11,

wherein the first organic compound is represented by General Formula (G3),

13. The light-emitting element according to claim 11 comprising, between the pair of electrodes:

a light-emitting layer,

wherein the first organic compound, the second organic compound, and the phosphorescent compound are included in the light-emitting layer.

14. The light-emitting element according to claim 11 comprising, between the pair of electrodes:

a light-emitting layer; and

a hole-transport layer in contact with the light-emitting layer,

wherein the first organic compound is included in the hole-transport layer.

15. The light-emitting element according to claim 11 comprising, between the pair of electrodes:

a light-emitting layer; and

a hole-transport layer in contact with the light-emitting layer,

wherein the first organic compound, the second organic compound, and the phosphorescent compound are included in the light-emitting layer, and

wherein the first organic compound is included in the hole-transport layer.

16. The light-emitting element according to claim 11,

wherein the Ar¹ and the Ar² each independently represent a substituted or unsubstituted 2-fluorenyl group, a substituted or unsubstituted spiro-9,9′

-bifluoren-2-yl group, or a biphenyl-4-yl group.

17. The light-emitting element according to claim 11, wherein a combination of the first organic compound and the second organic compound forms an exciplex.

18. A light-emitting device comprising the light-emitting element according to claim 11 in a light-emitting portion.

19. An electronic device comprising the light-emitting device according to claim 18 in a display portion.

20. A lighting device comprising the light-emitting device according to claim 18 in a light-emitting portion.