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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 12295255 B1

PDFFull Text
Date of Patent:
May. 06, 2025

Filed:

Feb. 24, 2020

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

Applicant:

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

Inventors:

Takahiro Ishisone, Kanagawa, JP;

Nobuharu Ohsawa, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Assignee:

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

Attorney:

Husch Blackwell LLP

Primary Examiner:

Robert D Harlan

Int. Cl.
CPC ...
H01L 51/00 (2005.12); C09K 11/06 (2005.12); G06F 3/041 (2005.12); H01L 51/50 (2005.12); H10K 85/30 (2022.12); H10K 85/40 (2022.12); H10K 85/60 (2022.12); H10K 50/11 (2022.12); H10K 50/13 (2022.12); H10K 101/10 (2022.12); H10K 101/30 (2022.12); H10K 101/40 (2022.12);
U.S. Cl.
CPC ...
H10K 85/633 (2023.01); H10K 85/346 (2023.01); H10K 85/40 (2023.01); H10K 85/622 (2023.01); H10K 85/636 (2023.01); H10K 85/654 (2023.01); H10K 85/6572 (2023.01); H10K 85/6574 (2023.01); H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 2101/10 (2023.01); H10K 2101/30 (2023.01); H10K 2101/40 (2023.01);
Abstract

A light-emitting device with high emission efficiency and reliability is provided. The light-emitting device includes first and second fluorescent light-emitting layers. A host material used in the first fluorescent light-emitting layer has a function of converting triplet excitation energy into light emission, a guest material used in the first light-emitting layer has a molecular structure including a luminophore and a protecting group, and one molecule of the guest material includes five or more protecting groups. The introduction of the protecting groups into the molecule inhibits transfer of triplet excitation energy by the Dexter mechanism from the host material to the guest material. An alkyl group or a branched-chain alkyl group is used as the protecting groups. The materials are selected such that the triplet excitation energy level of the host material in the second light-emitting layer is lower than the triplet excitation energy level of the guest material in the second light-emitting layer.

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