Wavelength-converting casting composition and white light-emitting semiconductor component

A light-emitting semiconductor component, comprising:

• a semiconductor body formed of a semiconductor layer sequence and being capable;
• during an operation of the semiconductor component, of emitting electromagnetic radiation in a first spectral range selected from ultraviolet, blue, and green;
• a wavelength-converting casting composition disposed in a vicinity of said semiconductor body and formed of a transparent casting resin and an inorganic luminous substance pigment powder dispersed in said transparent casting resin;
• said pigment powder comprising luminous substance pigments selected from the group consisting of garnets doped with rare earths;
• thiogallates doped with rare earths;
• aluminates doped with rare earths;
• and orthosilicates doped with rare earths;
• and
• said luminous substance pigments having grain sizes≦20 μm and a mean grain diameter d50≦5 μm and converting a portion of the radiation originating from said semiconductor component into radiation of a higher wavelength, such that the semiconductor component emits mixed radiation including the higher-wavelength radiation and radiation from the first spectral range.