Photoluminescence of (Gd1-x,Dyx)2O2SO4 Phosphors Synthesized by Homogeneous Precipitation Method
(Gd1-x,Dyx)2O2SO4 phosphors were synthesized by a homogeneous precipitation method from commercially available Gd2O3, Dy2O3, H2SO4 and Urea ((NH2)2CO) starting materials. XRD analysis shows that the amorphous precursor can be transformed into pure Gd2O2SO4 phase by calcining at 900 °C for 2 h in air. Photoluminescence (PL) spectroscopy reveals that the strongest and second emission peaks are located at 575 nm and 485 nm under 277 nm UV light excitation, which corresponds to the 4F9/2→6H13/2 and the 4F9/2→6H15/2 transitions of Dy3+ ions, and both transitions of Dy3+ ions have a single exponential decay behavior. The quenching concentration of Dy3+ ions is 1 mol%. The CIE chromaticity coordinate and the color temperature of (Gd0.99,Dy0.01)2O2SO4 phosphor are (0.306, 0.379, 0.315）and 6546 K, respectively.
Jianzhong Wang and Jingang Qi
J. B. Lian et al., "Photoluminescence of (Gd1-x,Dyx)2O2SO4 Phosphors Synthesized by Homogeneous Precipitation Method", Advanced Materials Research, Vols. 299-300, pp. 612-615, 2011