Patent ID: 7235189

Claim:
A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body, the wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦20 μm and a mean grain diameter d 50 ≦5 μm, the method which comprises: providing a base of transparent epoxy casting resin; providing the luminous substance pigments from a phosphorus group having the general formula A 3 B 5 X 12 :M, where A is at least one element selected from the group consisting of Y, Gd, Lu, Sc. and La; B is at least one element selected from the group consisting of Al and Ga; X is oxygen; and M is at least one element selected from the group consisting of Ce, Eu, Cr, Nd, Er, and Tb; and mixing the luminous substance pigments with the base.