Mercury vapor lamp with terbium-activated gadolinium borate luminescent layer
 A mercury vapor discharge lamp includes, as a luminescent material, a terbium-activated gadolinium borate wherein the terbium comprises about 2-40% of total terbium and gadolinium. Said material is capable of excitation by ultraviolet radiation at 254 nm. without sensitization by materials such as trivalent cerium. 
General Electric Company
H C
H01J C09K
inventional inventional
Alok M.
Srivastava