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. 25, 2014
Filed:
Mar. 01, 2005
Toshihiro Iwakuma, Sodegaura, JP;
Hiroya Yasuda, Sodegaura, JP;
Kiyoshi Ikeda, Sodegaura, JP;
Keiko Yamamichi, Sodegaura, JP;
Takashi Arakane, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Toshihiro Iwakuma, Sodegaura, JP;
Hiroya Yasuda, Sodegaura, JP;
Kiyoshi Ikeda, Sodegaura, JP;
Keiko Yamamichi, Sodegaura, JP;
Takashi Arakane, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
Provided is an organic electroluminescent device in which an organic thin film layer comprising a single layer or plural layers comprising a phosphorescence light-emitting layer containing at least a host material and a phosphorescent organic metal complex is interposed between a cathode and an anode, wherein the total of the halogen element mass concentrations of bromine, iodine and chlorine which are contained as impurities in the host material constituting the light-emitting layer described above is 50 ppm or less. It has a high emission luminance, a high luminous efficiency and a long life.