Patent ID: 7345413

Claim:
A light-emitting device, having at least one radiation source which emits essentially within the range of from 150 to 600 nm, and a luminescent material which converts the light from the radiation source at least partially into longer-wave radiation, the luminescent material being formed by particles which are coated by a coating layer, wherein a coating material for the coating layer is selected from at least one of the following groups: alkylsilyl halides of the stoichiometry R 2 SiX 2 , wherein R=alkyl and X=Cl or Br; arylsilyl halides of the stoichiometry Ar 3 SiX or Ar 2 SiX 2 , wherein Ar=phenyl and X=halogen; phenyl-substituted silicon alkoxides; alkyl halides of the type R—X, wherein R=aliphatic residue and X=halogen; and acyl halides of the type wherein R=aliphatic residue and X=halogen.