Skip to Content
Find More Like This
Return to Search

Blue-green and green phosphors for lighting applications

United States Patent

December 11, 2012
View the Complete Patent at the US Patent & Trademark Office
Embodiments of the present techniques provide a related family of phosphors that may be used in lighting systems to generate blue or blue-green light. The phosphors include systems having a general formula of: ((Sr.sub.1-zM.sub.z).sub.1-(x+w)A.sub.wCe.sub.x).sub.3(Al.sub.1-ySi.s- ub.y)O.sub.4+y+3(x-w)F.sub.1-y-3(x-w) (I), wherein 0<x.ltoreq.0.10, 0.ltoreq.y.ltoreq.0.5, 0.ltoreq.z.ltoreq.0.5, 0.ltoreq.w.ltoreq.x, A is Li, Na, K, Rb, or Ag or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof. Advantageously, phosphors made accordingly to these formulations maintain emission intensity across a wide range of temperatures. The phosphors may be used in lighting systems, such as LEDs and fluorescent tubes, among others, to produce blue and blue/green light. Further, the phosphors may be used in blends with other phosphors, or in combined lighting systems, to produce white light suitable for illumination.
Setlur; Anant Achyut (Niskayuna, NY), Chandran; Ramachandran Gopi (Bangalore, IN), Henderson; Claire Susan (Schenectady, NY), Nammalwar; Pransanth Kumar (Bangalore, IN), Radkov; Emil (Euclid, OH)
General Electric Company (Niskayuna, NY)
12/ 256,142
October 22, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under contract number DE-FC26-06NT42934 awarded by the Department of Energy. The Government has certain rights in the invention.