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:
Oct. 14, 2003
Filed:
Jun. 06, 2002
Applicant:
Inventors:
Mamoru Mitomo, Tsukba, JP;
Tadashi Endo, Sendai, JP;
Kyouta Ueda, Sendai, JP;
Masakazu Komatsu, Sendai, JP;
Assignee:
National Institute for Materials Science, Tsukuba, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 3/300 ; C09K 1/164 ; C03C 3/11 ;
U.S. Cl.
CPC ...
H01L 3/300 ; C09K 1/164 ; C03C 3/11 ;
Abstract
A sialon type phosphor in the form of a powder comprising at least 40 wt % of &agr;-sialon represented by the formula (Ca ,M )(Si,Al) (O,N) (where M is at least one metal selected from the group consisting of Eu, Tb, Yb and Er, 0.05<(x+y)<0.3, 0.02<x<0.27 and 0.03<y<0.3) and having a structure such that Ca sites of Ca-&agr;-sialon are partially substituted by other metal M, at most 40 wt % of &bgr;-sialon, and at most 30 wt % of unreacted silicon nitride.