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. 21, 2014
Filed:
Dec. 23, 2011
Toshihiko Tsukatani, Echizen, JP;
Kazuhiro Wataya, Echizen, JP;
Yasushi Takai, Echizen, JP;
Takehisa Minowa, Echizen, JP;
Toshihiko Tsukatani, Echizen, JP;
Kazuhiro Wataya, Echizen, JP;
Yasushi Takai, Echizen, JP;
Takehisa Minowa, Echizen, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
Phosphor particles are provided in the form of spherical polycrystalline secondary particles consisting of a multiplicity of primary particles, including a garnet phase having the composition: (ABC)COwherein A is Y, Gd, and/or Lu, B is Ce, Nd, and/or Tb, C is Al and/or Ga, and x, y and z are in the range: 0.002<y≦0.2, 0<z≦2/3, and x+y+z=1. The phosphor particles are prepared by granulating powder oxides containing one or more of the elements A, B, and C, melting the granules in a plasma and solidifying outside the plasma, and heat treating the resulting particles in a non-oxidizing atmosphere at a temperature of higher than 800° C. to 1,700° C.