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. 17, 2008
Filed:
Aug. 25, 2004
Applicants:
Kengo Kishino, Kanagawa, JP;
Shinjiro Okada, Kanagawa, JP;
Akira Tsuboyama, Tokyo, JP;
Satoshi Igawa, Kanagawa, JP;
Manabu Furugori, Tokyo, JP;
Hironobu Iwawaki, Kanagawa, JP;
Inventors:
Kengo Kishino, Kanagawa, JP;
Shinjiro Okada, Kanagawa, JP;
Akira Tsuboyama, Tokyo, JP;
Satoshi Igawa, Kanagawa, JP;
Manabu Furugori, Tokyo, JP;
Hironobu Iwawaki, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 51/54 (2006.01);
U.S. Cl.
CPC ...
Abstract
The object of the present invention is to provide a light-emitting device that emits phosphorescence with high efficiency. The light-emitting device of the present invention includes a host containing two kinds of dopants, wherein a dopant having a longer maximum-emission wavelength is doped in a low concentration and has a substituent.