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:
Aug. 30, 2005
Filed:
Sep. 26, 2003
Yuji Hamada, Nara, JP;
Hiroshi Kanno, Osaka, JP;
Kazuki Nishimura, Hirakata, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A light-emitting device including a plurality of emission layers, which has improved luminous efficiency and improved reliability (or device lifetime), is provided. The light-emitting device includes a first emission layer formed on a substrate, and a second emission layer formed on the first emission layer to provide a laminated structure, for emitting light having a different wavelength from that of light emitted by the first emission layer. At least one of the first emission layer and the second emission layer includes a host material, a luminescent first dopant material and a non-luminescent second dopant material.