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:
Jul. 02, 2019
Filed:
Mar. 25, 2013
Nippon Steel & Sumikin Chemical Co., Ltd., Tokyo, JP;
Pioneer Corporation, Kawasaki-shi, Kanagawa, JP;
Tohoku Pioneer Corporation, Tendo-shi, Yamagata, JP;
Takayuki Fukumatsu, Kitakyushu, JP;
Katsuhide Noguchi, Kitakyushu, JP;
Masashi Tada, Kitakyushu, JP;
Mitsuru Sakai, Kitakyushu, JP;
Tohru Asari, Kitakyushu, JP;
Kazuto Shiraishi, Kitakyushu, JP;
Takahiro Kai, Kitakyushu, JP;
Yasuhiro Takahashi, Kawasaki, JP;
Yuhki Terao, Kawasaki, JP;
Taishi Tsuji, Kawasaki, JP;
Yusuke Nakajima, Yonezawa, JP;
Toshinao Yuki, Yonezawa, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
PIONEER CORPORATION, Kanagawa, JP;
TOHOKU PIONEER CORPORATION, Yamagata, JP;
Abstract
Provided is a practically useful organic electroluminescent device (organic EL device) having high efficiency and high driving stability while being capable of being driven at a low voltage. The organic electroluminescent device includes a light-emitting layer between an anode and a cathode opposite to each other. The light-emitting layer contains two host materials and at least one light-emitting dopant. One of the two host materials is a host material selected from an indolocarbazole compound having one indolocarbazole ring and an indolocarbazole compound having two indolocarbazole rings, and the other thereof is a host material selected from carbazole compounds.