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:
Oct. 21, 2008
Filed:
May. 27, 2004
Takashi Shinohara, Suwa, JP;
Yuji Shinohara, Suwa, JP;
Masamitsu Uehara, Shiojiri, JP;
Masamitsu Shimazu, Matsumoto, JP;
Ryuji Ishii, Chino, JP;
Takashi Shinohara, Suwa, JP;
Yuji Shinohara, Suwa, JP;
Masamitsu Uehara, Shiojiri, JP;
Masamitsu Shimazu, Matsumoto, JP;
Ryuji Ishii, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An organic EL device with a voltage applied across an anode and a cathode so that holes are moved in a hole transport layer and electrons are moved in an electron transport layer, and the holes and the electrons are recombined in a light emitting layer to emit light. The light emitting layer is formed of light emitting material having one or more kinds of metallic impurities. By using such a light emitting material, the decrease of light-emission luminance of the organic EL device can be suppressed.