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:
Feb. 28, 2012
Filed:
Feb. 28, 2006
Hideyuki Emoto, Machida, JP;
Masahiro Ibukiyama, Machida, JP;
Kenji Nomura, Machida, JP;
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is a phosphor material for a white LED with a blue LED or ultraviolet LED as a light source. A phosphor comprises an α-sialon represented by the formula: (M1)(M2)(Si)(Al)(O)(N)where M1 is at least one element selected from the group consisting of Li, Mg, Ca, Y and lanthanide metals (except for La and Ce), M2 is at least one element selected from Ce, Pr, Eu, Tb, Yb and Er, 0.3≦X+Y≦1.5, 0<Y≦0.7, 0.6≦m≦3.0, 0≦n≦1.5 and X+Y=m/2; and the oxygen content in a powder of the α-sialon is at most 0.4 mass % larger than a value calculated based on the formula.