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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 12063803 B1

PDFFull Text
Date of Patent:
Aug. 13, 2024

Filed:

Jun. 24, 2021

Light-emitting element including light-emitting layer having host material

Applicant:

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

Inventors:

Naoaki Hashimoto, Kanagawa, JP;

Tsunenori Suzuki, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Hiromi Seo, Kanagawa, JP;

Hiromitsu Kido, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Ida M Soward

Int. Cl.
CPC ...
H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 59/38 (2023.01); G09G 3/3266 (2016.01); G09G 3/3275 (2016.01); H01L 27/146 (2006.01); H10K 50/14 (2023.01); H10K 50/17 (2023.01); H10K 50/818 (2023.01); H10K 50/842 (2023.01); H10K 50/856 (2023.01); H10K 50/86 (2023.01); H10K 59/121 (2023.01); H10K 59/126 (2023.01); H10K 59/131 (2023.01); H10K 59/32 (2023.01); H10K 59/35 (2023.01); H10K 59/40 (2023.01); H10K 85/60 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01);
U.S. Cl.
CPC ...
H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 59/38 (2023.02); G09G 3/3266 (2013.01); G09G 3/3275 (2013.01); G09G 2300/0408 (2013.01); G09G 2300/0804 (2013.01); H01L 27/14678 (2013.01); H10K 50/14 (2023.02); H10K 50/17 (2023.02); H10K 50/171 (2023.02); H10K 50/818 (2023.02); H10K 50/8426 (2023.02); H10K 50/856 (2023.02); H10K 50/865 (2023.02); H10K 59/1216 (2023.02); H10K 59/126 (2023.02); H10K 59/131 (2023.02); H10K 59/32 (2023.02); H10K 59/35 (2023.02); H10K 59/40 (2023.02); H10K 85/615 (2023.02); H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/90 (2023.02);
Abstract

A light-emitting element that includes a fluorescent material and has a high emission efficiency is provided. A light-emitting element in which a delayed fluorescence component due to TTA accounts for a high proportion of emissive components is provided. A novel light-emitting device with a high emission efficiency and a low power consumption is provided. A light-emitting element includes an anode, a cathode, and an EL layer. The EL layer includes a light-emitting layer including a host material and an electron-transport layer including a first material in contact with the light-emitting layer. The LUMO level of the first material is lower than that of the host material. The proportion of a delayed fluorescence component due to TTA is greater than or equal to 10 percent of the light emission from the EL layer. The proportion of the delayed fluorescence component due to TTA may be greater than or equal to 15 percent of the light emission.

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