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:
Apr. 09, 2013
Filed:
Feb. 18, 2011
Koichi Genei, Fukuoka-ken, JP;
Kenji Fujimoto, Fukuoka-ken, JP;
Miwa Ishida, Fukuoka-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a light emitting device includes a substrate, a light emitting layer, a first conductivity type layer, a first and a second distributed Bragg reflector layer. The first conductivity type layer is provided between the substrate and the light emitting layer. The first reflector layer is provided between the first conductivity type layer and the substrate. First and second layers are alternately stacked therein. The second layers have refractive index different from that of the first layers. The first reflector layer has a center wavelength substantially same as emission wavelength of emission light. The second reflector layer is provided between the light emitting layer and the first reflector layer. Third and fourth layers are alternately stacked therein. The fourth layers have refractive index different from that of the third layers. The second reflector layer has a center wavelength longer than the center wavelength of the first reflector layer.