General Electric Company
COATED RED LINE EMITTING PHOSPHORS

Abstract:

A process for coating a phosphor of formula I: A.sub.x[MF.sub.y]:Mn.sup.4+ includes combining the phosphor of formula I in particulate form with a first solution including a compound of formula II: A.sub.x[MF.sub.y] to form a suspension and combining a second solution with the suspension, the second solution including a precursor including an element selected from the group consisting of calcium, strontium, magnesium, yittrium, barium, scandium, lanthanum, and combinations thereof. A population of particles having a core including a phosphor of formula I and a manganese-free composite coating disposed on the core, and a lighting apparatus (10) including the population of particles are also presented.