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. 07, 2007
Filed:
Feb. 01, 2006
Ken Sakuma, Sakura, JP;
Naoki Kimura, Sakura, JP;
Koichiro Masuko, Sakura, JP;
Naoto Hirosaki, Tsukuba, JP;
Ken Sakuma, Sakura, JP;
Naoki Kimura, Sakura, JP;
Koichiro Masuko, Sakura, JP;
Naoto Hirosaki, Tsukuba, JP;
Fujikura Ltd., Tokyo, JP;
Independent Administrative Institution National Institute for Materials Science, Ibaraki-ken, JP;
Abstract
A light-emitting device and illumination apparatus using the same are provided. The light-emitting device includes a semiconductor light-emitting element that emits blue-violet or blue light and a fluorescent material that absorbs the light emitted by the semiconductor light-emitting element and emits fluorescence of wavelengths different from the light, wherein the fluorescent material includes a mixture of a first fluorescent material, a second fluorescent material that has a longer emission wavelength than that of the first fluorescent material, and a third fluorescent material that has a longer emission wavelength than the second fluorescent material, and the first fluorescent material is a europium-activated β-SiAlON fluorescent material, the second fluorescent material is a europium-activated α-SiAlON fluorescent material, and the third fluorescent material is a nitride crystalline red fluorescent material of a general formula of (Ca,Eu)AlSiN3. The illumination apparatus includes a light source including a light emitting device as described above.