IP Library › Granted Patent US 12,660,501
Granted Patent B2
US 12,660,501 · App. 18/744,832 · Granted Jun 16, 2026

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

Inventors: Satoshi Seo (Sagamihara, JP); Nobuharu Ohsawa (Zama, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H10K85/654C09K11/025C09K11/06H10K85/636H10K85/657H10K85/6572C09K2211/1007C09K2211/1044H10K50/11H10K2101/30H10K2101/90Y02P20/582
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Quick Facts
Patent No.
US 12,660,501
App. No.
18/744,832
Granted
Jun 16, 2026
Kind
B2
Abstract

A light-emitting element containing a light-emitting material and having high light emission efficiency is provided. The light-emitting element includes a host material and a guest material. The host material includes at least a first molecule and a second molecule having the same molecular structure. The guest material has a function of exhibiting fluorescence or converting triplet excitation energy into light emission. The first molecule and the second molecule each include a first skeleton, a second skeleton, and a third skeleton, and the first skeleton and the second skeleton are bonded to each other through the third skeleton. The first skeleton includes at least one of a π-electron rich heteroaromatic skeleton and an aromatic amine skeleton and the second skeleton includes a π-electron deficient heteroaromatic skeleton. The first molecule and the second molecule have a function of forming an excited complex.

Claims (46)

1 . A light-emitting device comprising:

a light-emitting layer, the light-emitting layer comprising:

a compound comprising at least a first molecule and a second molecule, the first molecule and the second molecule having the same molecular structure; and

a fluorescent material as a guest material,

wherein each of the first molecule and the second molecule comprises:

a first skeleton comprising at least one of a π-electron rich heteroaromatic skeleton and an aromatic amine skeleton;

a second skeleton comprising a π-electron deficient heteroaromatic skeleton which is not a benzofuropyrimidine skeleton; and

a third skeleton,

wherein the first skeleton and the second skeleton are bonded to each other through the third skeleton,

wherein the first molecule and the second molecule are configured to form an excited complex with the first skeleton in the first molecule and the second skeleton in the second molecule, and

wherein the excited complex is configured to exhibit thermally activated delayed fluorescence at room temperature.

2 . The light-emitting device according to claim 1 , wherein the π-electron deficient heteroaromatic skeleton comprises at least one of a pyridine skeleton, a diazine skeleton, and a triazine skeleton.

3 . The light-emitting device according to claim 1 , wherein the π-electron rich heteroaromatic skeleton comprises at least one of a thiophene skeleton, a furan skeleton, and a pyrrole skeleton.

4 . The light-emitting device according to claim 1 , wherein the third skeleton comprises at least one of a m-phenylene group and an o-phenylene group.

5 . The light-emitting device according to claim 1 , wherein the third skeleton comprises a biphenyldiyl group.

6 . The light-emitting device according to claim 1 , wherein light emitted from the excited complex overlaps with an absorption band of the fluorescent material on the lowest energy side.

7 . A light-emitting device comprising:

a light-emitting layer, the light-emitting layer comprising:

a compound comprising at least a first molecule and a second molecule, the first molecule and the second molecule having the same molecular structure; and

a fluorescent material as a guest material,

wherein each of the first molecule and the second molecule comprises:

a first skeleton comprising at least one of a π-electron rich heteroaromatic skeleton and an aromatic amine skeleton; and

a second skeleton comprising a π-electron deficient heteroaromatic skeleton,

wherein the first molecule and the second molecule are configured to form an excited complex with the first skeleton in the first molecule and the second skeleton in the second molecule,

wherein the excited complex is configured to exhibit thermally activated delayed fluorescence at room temperature, and

wherein a difference between a peak of an emission spectrum of the compound in a toluene solution and a peak of an emission spectrum of a thin film of the compound is 30 nm or more.

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

wherein the first skeleton and the second skeleton are bonded to each other through a third skeleton.

9 . The light-emitting device according to claim 7 , wherein the π-electron deficient heteroaromatic skeleton comprises at least one of a pyridine skeleton, a diazine skeleton, and a triazine skeleton.

10 . The light-emitting device according to claim 7 , wherein the π-electron rich heteroaromatic skeleton comprises at least one of a thiophene skeleton, a furan skeleton, and a pyrrole skeleton.

11 . The light-emitting device according to claim 7 , wherein light emitted from the excited complex overlaps with an absorption band of the fluorescent material on the lowest energy side.

12 . A light-emitting device comprising:

a light-emitting layer, the light-emitting layer comprising:

a compound comprising at least a first molecule and a second molecule, the first molecule and the second molecule having the same molecular structure; and

a fluorescent material as a guest material,

wherein each of the first molecule and the second molecule comprises:

a first skeleton comprising at least one of a π-electron rich heteroaromatic skeleton and an aromatic amine skeleton;

a second skeleton comprising a π-electron deficient heteroaromatic skeleton; and

a third skeleton,

wherein the first skeleton and the second skeleton are bonded to each other through the third skeleton,

wherein the compound forms an excited complex,

wherein the excited complex is configured to exhibit thermally activated delayed fluorescence at room temperature, and

wherein a difference between a peak of an emission spectrum of the compound in a toluene solution and a peak of an emission spectrum of a thin film of the compound is 30 nm or more.

13 . The light-emitting device according to claim 12 , wherein the π-electron deficient heteroaromatic skeleton comprises at least one of a pyridine skeleton, a diazine skeleton, and a triazine skeleton.

14 . The light-emitting device according to claim 12 , wherein the π-electron rich heteroaromatic skeleton comprises at least one of a thiophene skeleton, a furan skeleton, and a pyrrole skeleton.

15 . The light-emitting device according to claim 12 , wherein light emitted from the excited complex overlaps with an absorption band of the fluorescent material on the lowest energy side.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 17, 2024
From: SEO, SATOSHI; OHSAWA, NOBUHARU
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Reel/Frame 067741/0537 →
Priority Claims (1)
JP 2015-103903 · May 21, 2015 · national
Continuity (3)
Continuation 17118798 · Dec 11, 2020
Continuation 15155255 · May 16, 2016
Related Publication 20240341177A1 · Oct 10, 2024
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