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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 11950497 B1

PDFFull Text
Date of Patent:
Apr. 02, 2024

Filed:

Feb. 21, 2019

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

Applicant:

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

Inventors:

Satoshi Seo, Kanagawa, JP;

Nobuharu Ohsawa, Kanagawa, JP;

Takuya Haruyama, Kanagawa, JP;

Anna Tada, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Dawn L Garrett

Int. Cl.
CPC ...
H10K 85/60 (2023.01); C07C 211/61 (2006.01); C07F 7/08 (2006.01); C09K 11/06 (2006.01); H10K 50/11 (2023.01); H10K 59/121 (2023.01); H10K 85/00 (2023.01); H10K 85/40 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01); H10K 101/20 (2023.01);
U.S. Cl.
CPC ...
H10K 85/633 (2023.02); C07C 211/61 (2013.01); C07F 7/081 (2013.01); C09K 11/06 (2013.01); H10K 85/40 (2023.02); H10K 85/791 (2023.02); C07C 2601/14 (2017.05); C07C 2603/24 (2017.05); C09K 2211/1007 (2013.01); C09K 2211/1011 (2013.01); C09K 2211/1014 (2013.01); H10K 50/11 (2023.02); H10K 59/1213 (2023.02); H10K 85/615 (2023.02); H10K 2101/10 (2023.02); H10K 2101/20 (2023.02); H10K 2101/27 (2023.02);
Abstract

A light-emitting element with high emission efficiency and high reliability is provided. The light-emitting element includes a host material and a guest material in a light-emitting layer. The host material has a function of converting triplet excitation energy into light emission and the guest material emits fluorescence. The molecular structure of the guest material is a structure including a luminophore and protecting groups, and five or more protecting groups are included in one molecule of the guest material. The introduction of the protecting groups into the molecule inhibits energy transfer of triplet excitation energy by the Dexter mechanism from the host material to the guest material. As the protecting group, an alkyl group or a branched-chain alkyl group is used.

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