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:
Dec. 16, 2008
Filed:
Sep. 27, 2005
Kengo Kishino, Yokohama, JP;
Shinjiro Okada, Kamakura, JP;
Satoshi Igawa, Fujisawa, JP;
Masashi Hashimoto, Kawasaki, JP;
Hironobu Iwawaki, Yokohama, JP;
Minako Kurokawa, Kawasaki, JP;
Jun Kamatani, Tokyo, JP;
Kengo Kishino, Yokohama, JP;
Shinjiro Okada, Kamakura, JP;
Satoshi Igawa, Fujisawa, JP;
Masashi Hashimoto, Kawasaki, JP;
Hironobu Iwawaki, Yokohama, JP;
Minako Kurokawa, Kawasaki, JP;
Jun Kamatani, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a phosphorescent luminescent device which has high-efficiency and a long lifetime. The organic electroluminescent device according to the present invention includes a pair of electrodes and an organic layer disposed between the pair of electrodes, wherein the organic layer has at least a light-emitting layer, and the light-emitting layer include at least a host material and dopants containing at least a first dopant and a second dopant, and wherein a triplet lowest excitation level of the first dopant is higher than a triplet lowest excitation level of the host material, and a triplet lowest excitation level of the second dopant is lower than a triplet lowest excitation level of the host material.