Preparation and Luminescent Properties of NaY(WO4)2 :Sm3+ Powders.

A series of self-assembled 3D flower-like NaY1-x (WO4)2:xSm3+ (x = 0, 0. 005, 0. 010, 0. 015, 0. 020, 0. 025, 0. 030) powders were prepared by hydrothermal method and high temperature sintering, with trisodium citrate as the anchoring agent. The phase structure, morphology, composition and luminescence properties were characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), infrared spectrum(FT-IR) and photoluminescence spectroscopy (PL), respectively. The results show that the synthesized samples are pure NaY(WO4)2 with tetragoonal scheelite structure. NaY(WO4)2:Sm3+ powders can be excited by a wavelength of 405 nm and exhibit a strong orange-red emission at 600 nm, corresponding to the 4G5/2 →6H7/2 magnetic dipole transition of Sm3+. The optimum doping molar fraction of Sm3+ is determined to be of 0. 015 based on the maximum intensity of fluorescence emission. [ABSTRACT FROM AUTHOR]