logo

For the Inventor, By the Inventor

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 12389739 B1

PDFFull Text
Date of Patent:
Aug. 12, 2025

Filed:

Feb. 16, 2022

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

Applicant:

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

Inventors:

Takeyoshi Watabe, Kanagawa, JP;

Airi Ueda, Kanagawa, JP;

Yuta Kawano, Kanagawa, JP;

Nobuharu Ohsawa, Kanagawa, JP;

Satoshi Seo, Kanagawa, JP;

Assignee:

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

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Jay C Chang

Assistant Examiner:

Thaddeus J Kolb

Int. Cl.
CPC ...
H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 50/818 (2023.01); H10K 85/00 (2023.01); H10K 59/80 (2023.01); H10K 101/40 (2023.01);
U.S. Cl.
CPC ...
H10K 50/11 (2023.02); H10K 50/13 (2023.02); H10K 50/818 (2023.02); H10K 85/00 (2023.02); H10K 59/80518 (2023.02); H10K 59/876 (2023.02); H10K 59/879 (2023.02); H10K 2101/40 (2023.02);
Abstract

A light-emitting device with high emission efficiency is provided. The light-emitting device includes a first electrode, a second electrode, and an EL layer positioned between the first electrode and the second electrode. The EL layer includes at least a light-emitting layer, a first layer, a second layer, and a third layer. The first layer is positioned between the first electrode and the light-emitting layer. The third layer is positioned between the first layer and the light-emitting layer. The second layer is positioned between the first layer and the third layer. The first layer includes a first organic compound. The second layer includes a second organic compound. The third layer includes a third organic compound. The ordinary refractive index of the second organic compound is higher than the ordinary refractive indices of the first organic compound and the third organic compound.

Find Patent Forward Citations

Loading…