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

• US 11,043,637 B2
• Filed: 08/20/2018
• Issued: 06/22/2021
• 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, Abe, Kanta, Takeda, Kyoko, Seo, Satoshi
• Primary Examiner(s): Clark, Gregory D
• Application Number:
  US15/999,406
• Publication Number:
  US 20190013468A1
• Time in Patent Office: 1,037 Days
• 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:

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),

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),

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),

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),

16. The light-emitting element according to claim 9,

wherein the third organic compound represents Formula (128),