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Color stable manganese-doped phosphors

Patent ·
OSTI ID:1130051
; ; ;
A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor material radiationally coupled to the light source. The phosphor material includes a color-stable Mn.sup.+4 doped phosphor prepared by a process including 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.
Research Organization:
General Electric Company, Niskayuna, NY (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
EE0003251;
Assignee:
General Electric Company (Niskayuna, NY)
Patent Number(s):
8,710,487
Application Number:
13/561,192
OSTI ID:
1130051
Country of Publication:
United States
Language:
English

References (3)

Direct synthesis and properties of K2SiF6:Mn4+ phosphor by wet chemical etching of Si wafer journal July 2008
Photoluminescent properties of cubic K2MnF6 particles synthesized in metal immersed HF/KMnO4 solutions journal December 2010
Mn[sup 4+]-Activated Red Photoluminescence in K[sub 2]SiF[sub 6] Phosphor journal January 2008

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36 MATERIALS SCIENCE