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.:
Date of Patent:
Jun. 28, 2022
Filed:
Feb. 20, 2018
Nippon Steel Chemical & Material Co., Ltd., Tokyo, JP;
Yuta Sagara, Tokyo, JP;
Masashi Tada, Tokyo, JP;
Kazuaki Yoshimura, Tokyo, JP;
Junya Ogawa, Tokyo, JP;
Katsuhide Noguchi, Tokyo, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
Abstract
Provided is a thermally activated delayed fluorescence-emitting organic EL element having a low driving voltage, high luminous efficiency, and a prolonged lifespan. The organic EL element contains one or more light-emitting layers between an anode and a cathode that face each other, and at least one light-emitting layer contains a host material composed of a carbazole compound represented by formula (1) and a thermally activated delayed fluorescence material composed of an indolocarbazole compound containing an indolocarbazole ring in its molecule. Here, Lrepresents an aromatic group, and at least one Rrepresents a carbazolyl group, and n is 1 or 2.