US Patent 8721925 Co-doped silicooxynitrides

The invention relates to compounds of the formula (I) (Ca,Sr,Ba)6-X(Si1-yMey)3(O1-zMa2z)6N4:Eux (I), where Me=Th, Ru and/or Os Ma=F and/or Cl, x<0.5, y<1 and z<0.1, and to a process for the preparation of these compounds and use as phosphors and conversion phosphors for the conversion of the blue or near-UV emission from an LED.