Luminescence Properties Of Dy~(3+) Doped Gd2(WO4)3 Phosphor Prepared by Hydrothermal Method

摘要

The Dy~(3+) doped Gd2(WO4)3 phosphors have been successfully obtained through calcining the precursor prepared via hydrothermal method at 900?. The structure, morphology and luminescent properties of the resultant products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence excitation/photo-luminescence spectroscopy (PLE/PL), and fluorescence decay analysis. The (Gd_(1-x)Dy_x)2(WO4)3 (x=0.01-0.10) solid solutions, exhibit strong yellow luminescence at 575 nm (the ~4F_(9/2)→~6H_(13/2) electric dipole transition of Dy~(3+)) optimal UV excitation into the ~6H_(15/2)→ ~4H_(11/2) of Dy~(3+) at ?452 nm. The quenching concentration was determined to be ?7at.%, and the quenching was due to the exchange reaction between Dy~(3+). The emission intensity decreased monotonically with the used temperature increasing while the fluorescence lifetime (0.5±0.05 ms) does not alter appreciably. All the (Gd_(1-x)Dy_x)2(WO4)3 phosphors have similar CIE chromaticity coordinates and color temperatures of (?0.43±0.02, ?0.47±0.02) and ?3550 K respectively, but the lifetime for 575 nm emission decreased with the Dy~(3+) increasing ascribed to the energy transfer between Dy~(3+). The Gd2(WO4)3:Dy~(3+) yellow phosphors are expected to be widely used in white light LED and display areas.