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:
Nov. 09, 2021
Filed:
Jul. 27, 2017
Nippon Steel Chemical & Material Co., Ltd., Tokyo, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
Abstract
Provided is an organic electroluminescent (organic EL) element that exhibits a high efficiency while having a low drive voltage, and that exhibits a high stability while being driven. The organic electroluminescent element contains, in a light-emitting layer formed between an anode and a cathode opposing each other, a first host selected from indolocarbazole compounds represented by general formula (1), a second host selected from carbazole compounds represented by general formula (2), and a light-emitting dopant material. Here, Arand Arare aromatic hydrocarbon groups, Lis a direct bond or a phenylene group, and Lis an o-phenylene group.