US Patent 7144524 Sialon-based phosphor and its production method

Patent 7144524 was granted and assigned to Ube Industries on December, 2006 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Ube Industries

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

71445240

Patent Inventor Names

Shin-ichi Sakata0

Tetsuo Yamada0

Date of Patent

December 5, 2006

Patent Application Number

108927350

Date Filed

July 16, 2004

Patent Primary Examiner

‌

Karl Group

Patent abstract

To provide a Sialon-based phosphor having a high photoluminescent intensity, which can realize a high brightness LED, particularly a white LED using a blue LED as the light source, and a production method of the Sialon-based phosphor. The α-Sialon based phosphor of the present invention is represented by the formula:LixMyLnzSi12−(m+n)Al(m+n)OnN16−n (I)wherein M is at least one metal selected from Ca, Mg and Y, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb, Yb and Ce, x+ay+bz=m (assuming that the valence of metal M is a and the valence of lanthanide metal Ln is b), 0<x≦0.8, 0<y, 0<z, 0.3≦m<4.5, and 0<n<2.25.