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:
Mar. 07, 2023
Filed:
Mar. 03, 2016
Nippon Steel Chemical & Material Co., Ltd., Tokyo, JP;
Junya Ogawa, Kitakyushu, JP;
Takahiro Kai, Kitakyushu, JP;
Masanori Hotta, Kitakyushu, JP;
Yuji Ikenaga, Kitakyushu, JP;
Mitsuru Sakai, Kitakyushu, JP;
Masashi Tada, Kitakyushu, JP;
Tokiko Ueda, Kitakyushu, JP;
Katsuhide Noguchi, Kitakyushu, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
Abstract
Provided is an organic EL device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other. At least one of the light-emitting layers contains a host material and a light-emitting dopant, and (i) a first host formed of an indolocarbazole compound having one or two indolocarbazole rings, and (ii) a second host formed of a carbazole compound having a plurality of carbazole rings and having a bond structure represented by the following general formula (3) are used as the host material.