Patent ID: 8282986

Claim:
A method of applying a phosphor coating, comprising: (a) forming a suspension of a phosphor and a polymer binder system comprising a polymer binder dissolved in a solvent, the polymer binder being capable of decomposing thermally, the phosphor comprising at least one of: (S 1-x-y-z Ba x Ca y )Si 2 N 2 O 2 :Eu z , where 0<x<0.2, 0<y<0.2 and 0<z<0.1; Ca 1-x-y Sr x Si 2 N 2 O 2 :Eu y , where 0<x<0.5 and 0<y<0.1; (Sr 1-x-y-z Ca x Ba y ) 2 Si 5 N 8 :Eu z , where 0<x<1, 0<y<1 and 0<z<0.1; (Sr 1-x-y-z Ba x Ca y ) 2 Si 5-a Al a N 8-a O a :Eu z , where 0<x<1, 0<y<1, 0<z<0.1 and 0<a<4; and (Sr 1-x-y-z Ba x Ca y )Si 2 N 2 O 2 :Yb z , where 0<x<0.2, 0<y<0.2 and 0<z<0.1; (b) applying the suspension to a substrate to form a coating; (c) drying the coating; and (d) baking the coating in a nitrogen atmosphere at less than about 400° C. to thermally decompose the polymer binder to form the phosphor coating.