Patent ID: 7884535

Claim:
A low-pressure gas discharge lamp provided with a gas discharge vessel comprising a gas filling with a discharge-maintaining composition, wherein at least part of a wall of the discharge vessel is provided with a luminescent material comprising a first UV-B phosphor containing, in a host lattice, gadolinium(III) as an activator and praseodymium(III) as a sensitizer, wherein the low-pressure gas discharge lamp is further provided with means for generating and maintaining a low-pressure gas discharge for providing UV-radiation, wherein the first UV-B phosphor converts the UV-radiation into UV-B radiation, and wherein the host lattice is selected from compounds of an oxo-anion with a cationic metal species including lutetium(III), wherein the oxo-anion is selected from the group of gallates, germanates, arsenate, vanadate and mixtures thereof.