Color stable manganese-doped phosphors

A process for preparing color stable Mn+4 doped phosphors includes providing a phosphor of formula I; Ax [MFy]:Mn+4 (I) and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; Ax [MFy] (II); wherein A is Li, Na, K, Rb, Cs...

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Main Authors DESHPANDE ANIRUDHA RAJENDRA, SETLUR ANANT ACHYUT, LYONS ROBERT JOSEPH, GRIGOROV LJUDMIL SLAVCHEV
Format Patent
LanguageChinese
English
Published 04.12.2013
Subjects
ADHESIVES
CHEMISTRY
DYES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
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Summary:A process for preparing color stable Mn+4 doped phosphors includes providing a phosphor of formula I; Ax [MFy]:Mn+4 (I) and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; Ax [MFy] (II); wherein A is Li, Na, K, Rb, Cs, NR4 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 [MFy] 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+4 doped phosphor.
Bibliography:Application Number: CN201280014622