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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 12219873 B1

PDFFull Text
Date of Patent:
Feb. 04, 2025

Filed:

Jan. 23, 2024

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

Applicant:

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

Inventors:

Satoshi Seo, Kanagawa, JP;

Tsunenori Suzuki, Kanagawa, JP;

Naoaki Hashimoto, Kanagawa, JP;

Assignee:

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

Attorney:

Husch Blackwell LLP

Primary Examiner:

Anthony Ho

Int. Cl.
CPC ...
H01L 51/50 (2006.01); H10K 50/11 (2023.01); H10K 50/155 (2023.01); H10K 50/16 (2023.01); H10K 50/84 (2023.01); H10K 85/60 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01);
U.S. Cl.
CPC ...
H10K 85/6572 (2023.02); H10K 50/11 (2023.02); H10K 50/155 (2023.02); H10K 50/166 (2023.02); H10K 50/841 (2023.02); H10K 85/615 (2023.02); H10K 85/654 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02);
Abstract

Provided is a novel light-emitting element, a light-emitting element with a long lifetime, or a light-emitting element with high emission efficiency. The light-emitting element includes an EL layer between a pair of electrodes. The EL layer includes at least a light-emitting layer containing a fluorescent substance and a host material, a first electron-transport layer containing a first electron-transport material, and a second electron-transport layer containing a second electron-transport material, which are in contact with each other and in this order. The LUMO level of each of the host material and the second electron-transport material is higher than the LUMO level of the first electron-transport material.

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