Red-emitting phosphors, associated processes and devices

摘要

A process for synthesizing a Mn4+ doped phosphor is presented. The process includes contacting a source of Mn4+ ions to a suspension comprising aqueous hydrofluoric acid and a complex fluoride compound of formula (II) in solid form, and then contacting a source of A+ ions to the suspension to form the Mn4+ doped phosphor,
Ax[MFy]   (II)Wherein,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 the [MFy] ion;y is 5, 6 or 7.

主权项

1. A population of particles having a core which is substantially free of Mn4+ ions, a first shell and a second shell, wherein the core comprises a compound of formula (II)
Ax[MFy]   (II);the first shell comprises a composition of formula (IV)
Ax[(M1−z,Mnz)Fy]   (IV)and the second shell comprises a composition of formula (V)
Ax[(M1−w,Mnw)Fy]   (V)wherein
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 1, 2 or 3 and is equal to the absolute value of the charge of the [MFy] ion; y is 5, 6 or 7; and 0