Co-precipitation synthesis, structural and morphological characterization, and luminescence properties of Dy ~(3+) doped nanocrystal Gd _2(WO _4) _3 and Gd _2WO _6 phosphors

摘要

Nanocrystal Gd _2(WO _4) _3 and Gd _2WO _6 phosphors doped with Dy ~3 were prepared via co-precipitation method under different reaction conditions. It was found that the nanocrystal Gd _2(WO _4) _3 and Gd _2WO _6 phosphors exist in the monoclinic phase, and the phosphor particles showed sphere-like and uniform shape. The concentration quenching behavior and the dependence of fluorescence lifetime on the doping concentration were studied. It was found that the electric dipoledipole interaction is the physical mechanism for the energy transfer between Dy ~3 ions in both the nanocrystal Gd _2(WO _4) _3 and Gd _2WO _6 phosphors.