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Color stable manganese-doped phosphors

United States Patent

August 28, 2012
View the Complete Patent at the US Patent & Trademark Office
A process for preparing color stable Mn.sup.+4 doped phosphors includes providing a phosphor of formula I; A.sub.x[MF.sub.y]:Mn.sup.+4 I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; A.sub.x[MF.sub.y]; II wherein A is Li, Na, K, Rb, Cs, NR.sub.4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof. A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor composition radiationally coupled to the light source, and which includes a color stable Mn.sup.+4 doped phosphor.
Lyons; Robert Joseph (Burnt Hills, NY), Setlur; Anant Achyut (Niskayuna, NY), Deshpande; Anirudha Rajendra (Twinsburg, OH), Grigorov; Ljudmil Slavchev (Sofia, BG)
General Electric Company (Niskayuna, NY)
13/ 069,756
March 23, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT This invention was made with Government support under contract number DOE DE-EE0003251 awarded by the U.S. Department of Energy. The Government may have certain rights in the invention.