Method of making narrow-band uvb-emitting phosphors

Details Method of making narrow-band uvb-emitting phosphors Method of making narrow-band uvb-emitting phosphors

C - Chemistry, Metallurgy

09

K

C09K 11/78 (2006.01)

Patent

CA 2531984

A method is provided for making narrow-band, UVB-emitting, (Y,Gd,Ce,Pr)Mg borate phosphors. The method involves the use of a mixed oxide co-precipitate which is combined with MgO and boric acid and fired twice to form the borate phosphor. The mixed oxide co-precipitate is formed by dissolving sources of Y, Gd, Ce, and optionally Pr, in an acid solution. Oxalic acid or ammonia is added to the solution (or vice versa) to form a coprecipitate of oxalates or hydroxides that are further fired to obtain a mixed oxide coprecipitate. The use of the mixed oxide co-precipitate improves homogeneity and yields a phosphor having a higher brightness with very little or no sticking between the fired cakes and the firing crucibles.

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