Photoluminescence of Rare Earth Phosphors Na0.5Gd0.5WO4: RE3+ and Na0.5Gd0.5(Mo0.75W0.25)O4: RE3+ (RE=Eu, Sm, Dy)

Two series of phosphors, Na_0.5Gd_0.5WO₄: RE³⁺ and Na_0.5Gd_0.5(Mo_0.75W_0.25)O₄: RE³⁺ (RE?=?Eu, Sm, Dy) have been synthesized by hydrothermal process to obtain the high purity, which have been characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM). The results suggest that Na_0.5Gd_0.5(Mo_0.75W_0.25)O₄: RE³⁺ phosphors are more easily to crystallize than Na_0.5Gd_0.5WO₄: RE³⁺ ones. Both of them present the characteristic luminescence of Eu³⁺, Sm³⁺ and Dy³⁺. Especially the photoluminescent properties of Na_0.5Gd_0.5WO₄: x%Eu³⁺ (Sm³⁺) can be obtained to show white luminescence as the suitable doping concentration of Eu³⁺ or Sm³⁺.