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. 25, 2015
Filed:
Mar. 22, 2013
Applicant:
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Inventors:
Toshihiro Tsumori, Echizen, JP;
Kazuhiro Wataya, Echizen, JP;
Assignee:
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L 33/00 (2010.01); C09K 11/77 (2006.01); C04B 35/115 (2006.01); C04B 35/44 (2006.01);
U.S. Cl.
CPC ...
C09K 11/7774 (2013.01); C04B 35/115 (2013.01); C04B 35/44 (2013.01); C04B 2235/3224 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3229 (2013.01); C04B 2235/75 (2013.01); C04B 2235/9646 (2013.01); C04B 2237/60 (2013.01);
Abstract
An oxide ceramic fluorescent material is provided comprising a polycrystalline ceramic sintered body of YAlO, LuAlO, (Y,Lu)AlO, (Y,Gd)AlO, or AlOin which a rare earth element selected from Ce, Eu and Tb has been diffused from its surface as fluorescent activator. The concentration of the rare earth element is 1 wt % at a depth of 50-600 μm as measured from the sintered body surface and at least 1 wt % at any position nearer to the sintered body surface.