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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 12127471 B1

PDFFull Text
Date of Patent:
Oct. 22, 2024

Filed:

Jun. 29, 2023

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

Applicant:

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

Inventors:

Tsunenori Suzuki, Kanagawa, JP;

Naoaki Hashimoto, Kanagawa, JP;

Eriko Saijo, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Assignee:

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

Attorney:

Husch Blackwell LLP

Primary Examiner:

Raj R Gupta

Int. Cl.
CPC ...
H01L 51/00 (2006.01); H01L 51/50 (2006.01); H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 50/16 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01);
U.S. Cl.
CPC ...
H10K 85/342 (2023.02); H10K 50/11 (2023.02); H10K 50/13 (2023.02); H10K 50/16 (2023.02); H10K 85/622 (2023.02); H10K 85/631 (2023.02); H10K 85/633 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/30 (2023.02); H10K 2101/90 (2023.02);
Abstract

A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.

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