| 摘要 |
Low-HF or HF-free processes for improving color stability of a Mn+4 doped phosphor of formula (I) include contacting the phosphor of formula (I) with a solution that contains hexafluorosilicic acid, and isolating a treated phosphor of formula (I) having improved color stability relative to an untreated phosphor of formula (I): Ax [MFy]:Mn+4 wherein A is Li, Na, K, Rb, Cs, R4 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. |
