Photoluminescence properties of NaLa(WO4)2:Tb3+ novel green phosphors prepared by the combustion method

A series of NaLa(WO4)(2):Tb3+ green phosphors have been prepared by a facile combustion method. X-ray powder diffraction (XRD) and photoluminescence were used to characterize the structure and luminescence properties of as-synthesized phosphors, respectively. The XRD results confirm that the as-synthesized phosphors exhibit sheelite-type structure without any impurity phase. The excitation band of the phosphors covers a wide region of 200-300 nm. The as-obtained phosphors emit strong green light centered at 546 nm under ultraviolet light excitation (261 nm). The results show that the optimum temperature is 800 degrees C and the optimum concentration of Tb3+-dopant is 50 at%.