Patent ID: 8593062

Claim:
A color stable phosphor composition comprising particles of a phosphor of formula I, said particles having a coating composition disposed on surfaces thereof; ((Sr 1-z M z ) 1-(x+w) A w Ce x ) 3 (Al 1-y Si y )O 4+y+3(x−w) F 1-y-3(x−w) I wherein the coating composition comprises a material selected from aluminum oxide, magnesium oxide, calcium oxide, barium oxide, strontium oxide, zinc oxide, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, strontium hydroxide, zinc hydroxide, aluminum phosphate, magnesium phosphate, calcium phosphate, barium phosphate, strontium phosphate, and combinations thereof; A is Li, Na, K, or Rb, or a combination thereof; M is Ca, Ba, Mg, Zn, or a combination thereof; and 0<x≦0.10, 0≦y≦0.5, 0≦z≦0.5, 0≦w≦x.