Title
Enhancement of Photoluminescence in (Gd,Eu)2O(WO4)2 Phosphors by Lanthanum Doping into the Host Gd2O(WO4)2 Lattice
Author
Sun Woog Kim, Toshiyuki Masui, Nobuhito Imanaka
Year
2012
Journal
Journal of Solid State Science and Technology
Abstract
Red-emitting (Gd1−x−yLaxEuy)2O(WO4)2 (0 ≤ x ≤ 0.05, 0.30 ≤ y ≤ 0.50) phosphors were synthesized by the conventional solid state reaction method. Single phase gadolinium oxytungstate phosphors with high crystallinity and monoclinic structure were obtained, exhibiting excellent luminescence efficiency under excitation at wavelengths of 394 and 464 nm. The luminescence emission intensities of these phosphors were successfully enhanced by La3+ doping into the host Gd2O(WO4)2 lattice. The highest emission intensity was obtained for (Gd0.56La0.04Eu0.40)2O(WO4)2, of which the emission intensities were 18.9 and 37.0 times higher than those of a commercial (Y0.98Eu0.02)2O2S phosphor under excitation at 394 and 464 nm, respectively.
Full Article
Instrument
FP-8500
Keywords
Fluorescence, Photoluminescence, Optical properties