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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 11832465 B1

PDFFull Text
Date of Patent:
Nov. 28, 2023

Filed:

Jun. 08, 2022

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

Applicant:

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

Inventors:

Satoshi Seo, Kanagawa, JP;

Takahiro Ishisone, Kanagawa, JP;

Nobuharu Ohsawa, Kanagawa, JP;

Yusuke Nonaka, Kanagawa, JP;

Toshiki Sasaki, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Shahed Ahmed

Int. Cl.
CPC ...
H01L 51/50 (2006.01); H10K 50/11 (2023.01); G09G 3/3225 (2016.01); H10K 50/12 (2023.01); H10K 50/13 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 50/81 (2023.01); H10K 50/82 (2023.01); H10K 50/84 (2023.01); H10K 59/00 (2023.01); H10K 59/131 (2023.01); H10K 59/121 (2023.01); H10K 59/38 (2023.01); H10K 101/10 (2023.01); H10K 101/40 (2023.01); H10K 101/00 (2023.01); H10K 101/30 (2023.01);
U.S. Cl.
CPC ...
H10K 50/11 (2023.02); G09G 3/3225 (2013.01); H10K 50/12 (2023.02); H10K 50/13 (2023.02); H10K 50/131 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/81 (2023.02); H10K 50/82 (2023.02); H10K 50/84 (2023.02); H10K 59/00 (2023.02); H10K 59/1213 (2023.02); H10K 59/131 (2023.02); G09G 2300/0426 (2013.01); H10K 59/38 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02);
Abstract

Emission efficiency of a light-emitting element is improved. The light-emitting element has a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer includes a fluorescent material and a host material. The second light-emitting layer includes a phosphorescent material, a first organic compound, and a second organic compound. An emission spectrum of the second light-emitting layer has a peak in a yellow wavelength region. The first organic compound and the second organic compound form an exciplex.

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