Patent ID: 7687997

Claim:
A dielectric barrier discharge lamp for generating and emitting an ultraviolet radiation comprising: a cylindrical inner wall having a first inner surface, a first outer surface, a first electrode layer, a first reflective layer, and a first luminescent layer, wherein the first reflective layer is sandwiched between the first luminescent layer and the first inner surface; a cylindrical outer wall having a second inner surface, a second outer surface, a second electrode layer, a second reflective layer, and a second luminescent layer, wherein the second reflective layer is sandwiched between the second luminescent layer and the second inner surface, wherein the outer wall is transparent and the second reflective layer is absent on a portion of the outer wall; a cylindrical discharge gap formed between the inner wall and the outer wall, wherein the inner surface of the inner wall and the inner surface of the outer wall are facing the discharge gap, and wherein a filling is located within the discharge gap; diffusive radiation generated by a gas discharge inside the discharge gap, wherein the diffusive radiation is further emitted by the first and second luminescent coating layers, and wherein the emitted diffusive radiation is directed by reflections from the first and second reflective layers to the outer surrounding of the lamp through the portion of the outer wall for which the second reflective layer is absent.