Photoluminescence of rare earth phosphors Na0.5Gd 0.5WO4: RE3+ and Na 0.5Gd 0.5(Mo0.75W0.25)O4: RE3+ (RE=Eu, Sm, Dy).

Two series of phosphors, Na(0.5)Gd(0.5)WO(4): RE(3+) and Na(0.5)Gd(0.5)(Mo(0.75)W(0.25))O(4): RE(3+) (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(0.5)Gd(0.5)(Mo(0.75)W(0.25))O(4): RE(3+) phosphors are more easily to crystallize than Na(0.5)Gd(0.5)WO(4): RE(3+) ones. Both of them present the characteristic luminescence of Eu(3+), Sm(3+) and Dy(3+). Especially the photoluminescent properties of Na(0.5)Gd(0.5)WO(4): x%Eu(3+) (Sm(3+)) can be obtained to show white luminescence as the suitable doping concentration of Eu(3+) or Sm(3+).