IP Library › Granted Patent US 12,336,369
Granted Patent B2
US 12,336,369 · App. 18/626,690 · Granted Jun 17, 2025

Light-emitting element, display device, electronic device, and lighting device each having thermally-activated delayed fluorescent organic compound

Inventors: Nobuharu Ohsawa (Kanagawa, JP); Satoshi Seo (Kanagawa, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H10K50/121C09K11/02C09K11/06H10K50/16C09K2211/1007C09K2211/1044C09K2211/185H10K50/131H10K50/19H10K59/12H10K59/40H10K85/342H10K85/60H10K85/615H10K85/622H10K85/626H10K85/636H10K85/654H10K85/657H10K85/6572H10K85/6576H10K2101/27H10K2101/30
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Quick Facts
Patent No.
US 12,336,369
App. No.
18/626,690
Granted
Jun 17, 2025
Kind
B2
Abstract

A light-emitting element having high emission efficiency is provided. The light-emitting element includes a first organic compound, a second organic compound, and a third organic compound. The first organic compound has a function of converting triplet excitation energy into light emission. The second organic compound is preferably a TADF material. The third organic compound is a fluorescent compound. Light emitted from the light-emitting element is obtained from the third organic compound. Triplet excitation energy in a light-emitting layer is transferred to the third organic compound by reverse intersystem crossing caused by the second organic compound or through the first organic compound.

Claims (65)

1. A light-emitting device comprising:

a first electrode;

a light-emitting layer over the first electrode, the light-emitting layer comprising:

a first organic compound configured to emit phosphorescence;

a second organic compound comprising a π-electron rich skeleton and a x-electron deficient skeleton; and

a third organic compound configured to convert singlet excitation energy into light emission; and

a second electrode over the light-emitting layer,

wherein the light-emitting layer comprises a mixture of the first organic compound, the second organic compound, and the third organic compound,

wherein the third organic compound comprises at least two alkyl groups each having 2 or more carbon atoms.

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

wherein the π-electron rich skeleton and the π-electron deficient skeleton are directly bonded to each other.

3. The light-emitting device according to claim 1 ,

wherein the first organic compound is configured to supply excitation energy to the third organic compound.

4. A display device comprising:

the light-emitting device according to claim 1 ; and

at least one of a color filter and a transistor.

5. An electronic device comprising:

the display device according to claim 4 ; and

at least one of a housing and a touch sensor.

6. A lighting device comprising:

the light-emitting device according to claim 1 ; and

at least one of a housing and a touch sensor.

7. A light-emitting device comprising:

a first electrode;

a light-emitting layer over the first electrode, the light-emitting layer comprising:

a first organic compound configured to emit phosphorescence;

a second organic compound comprising a π-electron rich skeleton and a x-electron deficient skeleton; and

a third organic compound configured to convert singlet excitation energy into light emission; and

a second electrode over the light-emitting layer,

wherein the third organic compound comprises at least two branched alkyl groups each having 3 to 10 carbon atoms.

8. The light-emitting device according to claim 7 ,

wherein the π-electron rich skeleton and the π-electron deficient skeleton are directly bonded to each other.

9. The light-emitting device according to claim 7 ,

wherein the first organic compound is configured to supply excitation energy to the third organic compound.

10. A display device comprising:

the light-emitting device according to claim 7 ; and

at least one of a color filter and a transistor.

11. An electronic device comprising:

the display device according to claim 10 ; and

at least one of a housing and a touch sensor.

12. A lighting device comprising:

the light-emitting device according to claim 7 ; and

at least one of a housing and a touch sensor.

13. A light-emitting device comprising:

a first electrode;

a light-emitting layer over the first electrode, the light-emitting layer comprising:

a first organic compound configured to emit phosphorescence;

a second organic compound comprising a n-electron rich skeleton and a x-electron deficient skeleton; and

a third organic compound configured to convert singlet excitation energy into light emission; and

a second electrode over the light-emitting layer,

wherein the light-emitting layer comprises a mixture of the first organic compound, the second organic compound, and the third organic compound,

wherein the third organic compound comprises one of at least two cyclic hydrocarbon groups each having 3 to 10 carbon atoms, at least two bridged cyclic hydrocarbon groups each having 3 to 10 carbon atoms, and a condensed aromatic hydrocarbon each having 3 to 12 carbon atoms.

14. The light-emitting device according to claim 13 ,

wherein the π-electron rich skeleton and the π-electron deficient skeleton are directly bonded to each other.

15. The light-emitting device according to claim 13 ,

wherein the first organic compound is configured to supply excitation energy to the third organic compound.

16. A display device comprising:

the light-emitting device according to claim 13 ; and

at least one of a color filter and a transistor.

17. An electronic device comprising:

the display device according to claim 16 ; and

at least one of a housing and a touch sensor.

18. A lighting device comprising:

the light-emitting device according to claim 13 ; and

at least one of a housing and a touch sensor.

Priority Claims (1)
JP 2017-213080 · Nov 2, 2017 · national
Continuity (3)
Continuation 18138250 · Apr 24, 2023
Continuation 16758999
Related Publication 20240381684A1 · Nov 14, 2024
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