Photoluminescent Properties of Na + , Bi 3+ Co-Doped CaWO 4 : Eu 3+ Phosphor for PDPs

The photoluminescent properties of Na, Bi co-doped CaWO4:Eu3+ phosphor under vacuum ultraviolet (VUV) region excited was investigated. A red emission of CaWO4:Eu3+ can be observed under 147 nm excitation. It was also found that the photoluminescence intensity of Na doped CaWO4:Eu3+ would be enhanced than the un-doped phosphors due to Na+ ions would act as a charge compensator and it can restrict the generation of defects in CaWO4:Eu3+. Additionally, the photoluminescence enhancement of Na+, Bi3+ co-doped CaWO4:Eu3+ should due to the energy transfer between WO42-, Bi3+ and Eu3+, and Bi3+ ions would act as a medium for the energy transfer, via WO42-Bi3+Eu3+. These are expected to be applying in plasma display panels.