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. 24, 2014
Filed:
Feb. 27, 2009
Takayuki Fukumatsu, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Katsuhide Noguchi, Kitakyushu, JP;
Ikumi Ichihashi, Kitakyushu, JP;
Takayuki Fukumatsu, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Katsuhide Noguchi, Kitakyushu, JP;
Ikumi Ichihashi, Kitakyushu, JP;
Nippon Steel & Sumikin Chemical Co., Ltd., Tokyo, JP;
Abstract
Disclosed is an organic electroluminescent device (organic EL device) which can achieve high efficiency and long lifetime even when driven at low voltage. The organic El device comprises at least a light-emitting layer and an electron-transporting layer between an anode and a cathode facing each other. The electron-transporting layer consists of two layers, namely, a first electron-transporting layer and a second electron-transporting layer and the first electron-transporting layer and the second electron-transporting layer are arranged sequentially in this order from the light-emitting layer side to the cathode side. The first electron-transporting layer contains an indole derivative in which the ring nitrogen atom is substituted with an aromatic group and an aromatic ring is fused to the indole ring.