Patent ID: 6919679

Claim:
An electric lamp, consisting essentially of: a) a lamp envelope having an inner surface; b) means within the lamp envelope for generating ultraviolet radiation; c) a layer of a luminescent material adjacent the inner surface of the lamp envelope for generating visible light when impinged by said ultraviolet radiation; and d) a reflective layer, said reflective layer being disposed between said inner surface of said lamp envelope and said layer of luminescent material, for reflecting ultraviolet radiation which has passed through said layer of luminescent material back into said luminescent material for increasing the visible light output of said luminescent material, said reflective layer consisting essentially of a mixture of particulate non-fluorescent oxidic material and a getter material comprising a thermally decomposed getter precursor which reacts with contaminants present in the lamp, said getter material being formed on thermal decomposition of the getter precursor material during sintering.