logo

For the Inventor, By the Inventor

The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12495662 B1

PDFFull Text
Date of Patent:
Dec. 09, 2025

Filed:

Nov. 04, 2022

Light-emitting element and display device including tadf compound

Applicant:

Semiconductor Energy Laboratory Co., Ltd., Atsugi, JP;

Inventors:

Satoshi Seo, Kanagawa, JP;

Nobuharu Ohsawa, Kanagawa, JP;

Takeyoshi Watabe, Kanagawa, JP;

Assignee:

SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Kanagawa-ken, JP;

Attorneys:

Nixon Peabody LLP

Jeffrey L. Costellia

Primary Examiner:

Sheng-Bai Zhu

Int. Cl.
CPC ...
H10K 50/11 (2023.01); H10K 50/12 (2023.01); H10K 50/19 (2023.01); H10K 59/32 (2023.01); H10K 85/60 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01); H10K 101/40 (2023.01);
U.S. Cl.
CPC ...
H10K 50/11 (2023.02); H10K 50/121 (2023.02); H10K 50/19 (2023.02); H10K 59/32 (2023.02); H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/40 (2023.02); H10K 2101/90 (2023.02);
Abstract

Provided is a light-emitting element including a fluorescence-emitting material with high emission efficiency. The light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first organic compound, a second organic compound, and a guest material. The first organic compound has a function of emitting a thermally activated delayed fluorescence at room temperature. The guest material has a function of emitting fluorescence. A HOMO level of the first organic compound higher than or equal to a HOMO level of the second organic compound. A LUMO level of the first organic compound is lower than or equal to a LUMO level of the second organic compound.

Find Patent Forward Citations

Loading…