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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 11672136 B1

PDFFull Text
Date of Patent:
Jun. 06, 2023

Filed:

Feb. 18, 2021

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

Applicant:

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

Inventors:

Nobuharu Ohsawa, Kanagawa, JP;

Yusuke Nonaka, Kanagawa, JP;

Takahiro Ishisone, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Takuya Kawata, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Evren Seven

Int. Cl.
CPC ...
H10K 50/13 (2023.01); H10K 50/11 (2023.01); H10K 59/32 (2023.01); H10K 50/12 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 85/30 (2023.01); H10K 101/00 (2023.01); H10K 85/60 (2023.01); H10K 102/00 (2023.01);
U.S. Cl.
CPC ...
H10K 50/131 (2023.02); H10K 50/11 (2023.02); H10K 50/121 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 59/32 (2023.02); H10K 85/342 (2023.02); H10K 85/611 (2023.02); H10K 85/615 (2023.02); H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/90 (2023.02); H10K 2102/351 (2023.02);
Abstract

An object of one embodiment of the present invention is to provide a multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance, a separation layer containing a substance having a hole-transport property and a substance having an electron-transport property, and a second light-emitting layer containing two kinds of organic compounds that form an exciplex and a substance that can convert triplet excitation energy into luminescence. Note that a light-emitting element in which light emitted from the first light-emitting layer has an emission spectrum peak on the shorter wavelength side than an emission spectrum peak of the second light-emitting layer is more effective.

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