Patent ID: 8729786

Claim:
A phosphor mixture for a discharge lamp which comprises: (a) a first phosphor composition having an emission spectrum in the green and/or yellow spectral range, and comprises (i) a first phosphor compound which is free of Tb and is capable to absorb the UV radiation emitted by an Hg source and has an orthosilicate of the formula (Ba,Sr,Ca) 2 SiO 4 :Eu or an oxynitride of the formula (Sr 1-x-y Ba x Ca y )Si 2 O 2 N 2 :Eu (SrSiON), and (ii) at least one second phosphor compound which contains Tb, and which is selected from the group consisting of (Ce,Tb)MgAl 11 O 19 and (La,Ce,Tb)PO 4 , wherein a mass fraction of the second phosphor compound is less than a mass fraction of the first phosphor compound, and (b) a second phosphor composition having an emission spectrum in the red spectral range and comprises Y 2 O 3 :Eu.