| abstract |
The invention proposes a method for preparing coated phosphor particle groups. This method includes combining phosphor particles of formula I: A x [MF y ]: Mn 4+ with a first solution containing a compound of formula II: A x [MF y ] to form a suspension, 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 the absolute value of the charge of [MF y ] ions; and y is 5, 6 or 7. The method further includes combining the second solution containing the A + ion source and the suspension. |