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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 12250884 B1

PDFFull Text
Date of Patent:
Mar. 11, 2025

Filed:

May. 18, 2023

Light-emitting element, light-emitting device, electronic appliance, and lighting device

Applicant:

Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken, JP;

Inventors:

Hiromi Seo, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Satoko Shitagaki, Kanagawa, JP;

Assignee:

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

Attorney:

Husch Blackwell LLP

Primary Examiner:

Ismail A Muse

Int. Cl.
CPC ...
H01L 29/08 (2006.01); H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 50/16 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01);
U.S. Cl.
CPC ...
H10K 85/6576 (2023.02); H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 85/342 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/6572 (2023.02); H10K 50/16 (2023.02); H10K 85/615 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02); H10K 2101/90 (2023.02);
Abstract

A light-emitting element which has low driving voltage and high emission efficiency is provided. The light-emitting element includes, between a pair of electrodes, a hole-transport layer and a light-emitting layer over the hole-transport layer. The light-emitting layer contains a first organic compound having an electron-transport property, a second organic compound having a hole-transport property, and a light-emitting third organic compound converting triplet excitation energy into light emission. A combination of the first organic compound and the second organic compound forms an exciplex. The hole-transport layer contains at least a fourth organic compound whose HOMO level is lower than or equal to that of the second organic compound and a fifth organic compound whose HOMO level is higher than that of the second organic compound.

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