Processes For Preparing Color Stable Manganese Doped Complex Fluoride Phosphors

Abstract: 4+x(1 m)myxyxyxya4+4yA process for preparing a color stable Mn doped complex fluoride phosphor of formula (I) includes: A(M Mn) F; contacting a first aqueous HF solution comprising (1 m) parts of a compound of formula HMF and a second aqueous HF solution comprising m*n parts of a compound of formula A[MnF] with a third aqueous HF solution comprising (1 n) parts of the compound of formula A[MnF] and a compound of formula AX to yield a precipitate comprising the color stable Mn doped complex fluoride phosphor; wherein A is Li Na K Rb Cs NR or a combination thereof; M is Si Ge Sn Ti Zr Al Ga In Sc Hf Y La Nb Ta Bi Gd or a combination thereof; R is H lower alkyl or a combination thereof; X is an anion; a is the absolute value of the charge of the X anion; x is the absolute value of the charge of the [MF] ion; y is 5 6 or 7; 0

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