| abstract |
Method for preparing Mn 4+ doped phosphor of formula I A x [MF y ]: Mn +4 In n n Including contacting a compound of formula A x [MF y ], a compound of formula AX and a source of Mn + n containing a fluoromanganese compound with a fluorine-containing oxidant in a gaseous form at an elevated temperature to form the Mn 4+ dopant Type phosphor; where A is Li, Na, K, Rb, Cs 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; X is F, Cl, Br, I, HF 2 or a combination thereof; x is an absolute value of the charge of the [MF y ] ion; y is 5, 6, or 7; and n is 2, 3 or 4. |