ABSTRACT
References .....................................................................................................................................153
Lamp phosphors are divided into two main categories: those for fluorescent lamps and the others for high-pressure mercury lamps. All lamp phosphors in practical use are either oxides or oxyacid salts. As mentioned in 2.1, those phosphors are excited by ultraviolet (UV) rays generated in the rare gas/mercury discharge spaces. The strongest UV radiation generated in fluorescent lamps is located at 254 nm, whereas the dominant UV radiation in the high-pressure mercury lamps is located at 365 nm. The working temperatures of the phosphors during lamp operation are also quite different. Therefore, different kinds of phosphors are utilized for these two lamps.
