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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 12767661 B1

PDFFull Text
Date of Patent:
Oct. 20, 2026

Filed:

Jun. 29, 2021

Organic electroluminescent element

Applicant:

Nippon Steel Chemical & Material Co., Ltd., Tokyo, JP;

Inventors:

Takahiro Kai, Tokyo, JP;

Kentaro Hayashi, Tokyo, JP;

Junya Ogawa, Tokyo, JP;

Yuji Ikenaga, Tokyo, JP;

Ayaka Terada, Tokyo, JP;

Kazunari Yoshida, Tokyo, JP;

Ikumi Kitahara, Tokyo, JP;

Haruka Izumi, Tokyo, JP;

Katsuhide Noguchi, Tokyo, JP;

Atsushi Kawada, Tokyo, JP;

Assignee:

NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Robert S Loewe

Int. Cl.
CPC ...
H10K 101/00 (2023.01); C07D 487/04 (2006.01); H10K 71/16 (2023.01); H10K 85/60 (2023.01); H10K 50/12 (2023.01); H10K 101/30 (2023.01);
U.S. Cl.
CPC ...
C07D 487/04 (2013.01); H10K 71/16 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 85/6576 (2023.02); H10K 50/12 (2023.02); H10K 2101/30 (2023.02); H10K 2101/90 (2023.02);
Abstract

To provide an organic electroluminescent device having long lifetime characteristics while having a low driving voltage and high power efficiency. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposed to each other, wherein at least one of the light-emitting layers contains a host material including a first host material, a second host material and a third host material, and a light-emitting dopant material. A LUMO energy of the first host material is −1.95 eV or less, and LM2≥LM3≥LM1 is satisfied under the assumption that LUMO energies of the first host material, the second host material and the third host material are LM1, LM2 and LM3, respectively. A suitable first host material is an indolocarbazole compound represented by general formula (1), a suitable second host material is, for example, a biscarbazole compound represented by general formula (2), and a suitable third host material is an indolocarbazole compound represented by general formula (5).

Find Patent Forward Citations

Kai, Takahiro. (2026). Organic electroluminescent element (U.S. Patent No. 12767661). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12767661

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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