Patent ID: 7670507

Claim:
A phosphor composition for a low-pressure discharge lamp with a color rendering index R a greater than 80 and a high color temperature of 8000 K to 20.000 K, the phosphor composition comprising phosphors which emit in the red wavelength region and which comprise yttrium oxide doped with europium, phosphors which emit in the green wavelength region and which comprise lanthanum phosphate doped with cerium and terbium, and at least one phosphor which emits in the blue or blue-green wavelength region, wherein said europium-doped yttrium oxide forms between 30 and 50% by weight of the phosphor composition, said cerium- and terbium-doped lanthanum phosphate phosphor forms between 22 and 40% by weight of the phosphor composition, and said at least one phosphor which emits in the blue or blue-green wavelength region comprises barium-strontium-magnesium aluminate doped with manganese and europium forming between 10 and 20% by weight of the phosphor composition; or barium-magnesium alum mate doped with europium and manganese forming between 7 and 35% by weight of the phosphor composition; or strontium aluminate doped with europium forming between 3 and 15% by weight of the phosphor composition; or strontium borophosphate doped with europium forming between 3 and 15% by weight of the phosphor composition; and wherein the phosphor composition further comprises barium-magnesium aluminate doped with europium forming between 10 and 20% by weight of the phosphor composition as an additional phosphor emitting in the blue wavelength region.