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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 12262574 B1

PDFFull Text
Date of Patent:
Mar. 25, 2025

Filed:

Aug. 11, 2023

Light-emitting element

Applicant:

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

Inventors:

Satoshi Seo, Kanagawa, JP;

Hiromi Seo, Kanagawa, JP;

Tatsuyoshi Takahashi, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Telly D Green

Int. Cl.
CPC ...
H10K 50/11 (2023.01); C09K 11/02 (2006.01); C09K 11/06 (2006.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01);
U.S. Cl.
CPC ...
H10K 50/11 (2023.02); C09K 11/02 (2013.01); C09K 11/06 (2013.01); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 85/321 (2023.02); H10K 85/611 (2023.02); H10K 85/622 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); C09K 2211/1007 (2013.01); C09K 2211/1011 (2013.01); C09K 2211/1014 (2013.01); C09K 2211/1029 (2013.01); C09K 2211/1044 (2013.01); C09K 2211/1092 (2013.01); H10K 85/615 (2023.02); H10K 85/624 (2023.02); H10K 85/654 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02);
Abstract

To provide a light-emitting element which uses a fluorescent material as a light-emitting substance and has higher luminous efficiency. To provide a light-emitting element which includes a mixture of a thermally activated delayed fluorescent substance and a fluorescent material. By making the emission spectrum of the thermally activated delayed fluorescent substance overlap with an absorption band on the longest wavelength side in absorption by the fluorescent material in an Slevel of the fluorescent material, energy at an Slevel of the thermally activated delayed fluorescent substance can be transferred to the Sof the fluorescent material. Alternatively, it is also possible that the Sof the thermally activated delayed fluorescent substance is generated from part of the energy of a Tlevel of the thermally activated delayed fluorescent substance, and is transferred to the Sof the fluorescent material.

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