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:
Mar. 15, 2011
Filed:
Jun. 14, 2005
Mamoru Mitomo, Ibaraki, JP;
Naoto Hirosaki, Ibaraki, JP;
Hideyuki Emoto, Tokyo, JP;
Masahiro Ibukiyama, Tokyo, JP;
Mamoru Mitomo, Ibaraki, JP;
Naoto Hirosaki, Ibaraki, JP;
Hideyuki Emoto, Tokyo, JP;
Masahiro Ibukiyama, Tokyo, JP;
National Institute for Materials Science, Tsukuba-shi, Ibaraki, JP;
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An α-sialon is offered which is represented by general formula: (M1)(M2)(Si, Al)(O, N)(wherein M1 represents one or more elements selected from the group which consists of Li, Mg, Ca, Y and lanthanoid (except La and Ce) and M2 represents one or more elements selected from the group which consists of Ce, Pr, Eu, Tb, Yb and Er and wherein 0.3<X+Y<1.5 and 0<Y<0.7), the α-sialon containing from 30 ppm to 1% of fluorine as an impurity. By making primary particles of the α-sialon 1 to 10 μm in average particle size, an α-sialon phosphor can be obtained reproducibly, stably and in a large quantity. Especially, if containing 30 to 200 ppm of impurity fluorine, the α-sialon phosphor can exhibit an excellent emission characteristic as a white fluorescent matter.