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. 22, 2016
Filed:
Oct. 19, 2010
Takahiro Kai, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Masaki Komori, Kitakyushi, JP;
Kazuaki Yoshimura, Kitakyushu, JP;
Taishi Tsuji, Tsurugashima, JP;
Yasuhiro Takahashi, Tsurugashima, JP;
Toshinao Yuki, Yonezawa, JP;
Yusuke Nakajima, Yonezawa, JP;
Takahiro Kai, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Masaki Komori, Kitakyushi, JP;
Kazuaki Yoshimura, Kitakyushu, JP;
Taishi Tsuji, Tsurugashima, JP;
Yasuhiro Takahashi, Tsurugashima, JP;
Toshinao Yuki, Yonezawa, JP;
Yusuke Nakajima, Yonezawa, JP;
NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD., Tokyo, JP;
PIONEER CORPORATION, Kanagawa, JP;
TOHOKU PIONEER CORPORATION, Yamagata, JP;
Abstract
Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, fully secure of driving stability, and of a simple configuration. The organic EL device comprises organic layers comprising a hole-transporting layer and a light-emitting layer sandwiched between an anode and a cathode. The light-emitting layer contains a fluorescent light-emitting material and an electron- and/or exciton-blocking layer containing an indolocarbazole derivative represented by general formula (2) is disposed between the hole-transporting layer and the light-emitting layer so as to be adjacent to the light-emitting layer. In general formula (2), ring B is a heterocyclic ring fused to the adjacent rings and represented by formula (1c), Z is an n-valent aromatic hydrocarbon group or aromatic heterocyclic group, and n is 1 or 2.