Photoluminescence of oxygen dominated phosphors

The mechanism of fluorescence in (a) CaW04, (b) Zn2Si04:Mn, (c) 3.5 MgO + 0.5 MgF2 + GeO, : Mn, and (dl 3Ca,(P04), Ca(F, C1)2:Sb3+, Mn2+ under excitation by shortwave ultraviolet is explained by the electronic transitions involved in the activators. To get a daylight phosphor conforming to 6500"K, a blending of a sb3+ activated halophosphate blue phosphor and a Sb3+ and Mn2+ activated warmwhite phosphor is essential and the successful preparation of the same is presented