Luminescence Properties of Dy3+ Doped Gd2(WO4)3 Phosphor Prepared by Hydrothermal Method

Abstract

The Dy3+ doped Gd2(WO4)3 phosphors have been successfully obtained through calcining the precursor prepared via hydrothermal method at 900°C. 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 (Gd1-xDyx)2(WO4)3 (x=0.01-0.10) solid solutions, exhibit strong yellow luminescence at 575 nm (the 4F9/2→6H13/2 electric dipole transition of Dy3+) optimal UV excitation into the 6H15/2→ 4H11/2 of Dy3+ at ∼452 nm. The quenching concentration was determined to be ∼7at.%, and the quenching was due to the exchange reaction between Dy3+. 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 (Gd1-xDyx)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 Dy3+ increasing ascribed to the energy transfer between Dy3+. The Gd2(WO4)3:Dy3+ yellow phosphors are expected to be widely used in white light LED and display areas.