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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 12150325 B1

PDFFull Text
Date of Patent:
Nov. 19, 2024

Filed:

Sep. 25, 2023

Light-emitting element

Applicant:

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

Inventors:

Satoko Shitagaki, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Nobuharu Ohsawa, Kanagawa, JP;

Hideko Inoue, Kanagawa, JP;

Masahiro Takahashi, Kanagawa, JP;

Kunihiko Suzuki, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Ashok Patel

Int. Cl.
CPC ...
H10K 50/11 (2023.01); C09K 11/02 (2006.01); C09K 11/06 (2006.01); H05B 33/14 (2006.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 50/17 (2023.01); H10K 50/818 (2023.01); H10K 50/828 (2023.01); H10K 85/60 (2023.01); H10K 85/30 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01);
U.S. Cl.
CPC ...
H10K 50/11 (2023.02); C09K 11/025 (2013.01); C09K 11/06 (2013.01); H05B 33/14 (2013.01); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/17 (2023.02); H10K 50/171 (2023.02); H10K 50/818 (2023.02); H10K 50/828 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); C09K 2211/1007 (2013.01); C09K 2211/1044 (2013.01); C09K 2211/185 (2013.01); H10K 85/342 (2023.02); H10K 85/615 (2023.02); H10K 85/624 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 2101/00 (2023.02); H10K 2101/10 (2023.02);
Abstract

Provided is a light-emitting element with high external quantum efficiency, or a light-emitting element with a long lifetime. The light-emitting element includes, between a pair of electrodes, a light-emitting layer including a guest material and a host material, in which an emission spectrum of the host material overlaps with an absorption spectrum of the guest material, and phosphorescence is emitted by conversion of an excitation energy of the host material into an excitation energy of the guest material. By using the overlap between the emission spectrum of the host material and the absorption spectrum of the guest material, the energy smoothly transfers from the host material to the guest material, so that the energy transfer efficiency of the light-emitting element is high. Accordingly, a light-emitting element with high external quantum efficiency can be achieved.

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