Articles
  • Polyol synthesis of YVO4:Bi3+,Eu3+ nanophosphors and effect of silica coating on their photoluminescence properties 
  • Hiroki Haraa, Satoru Takeshitaa, Tetsuhiko Isobea,*, Tomohiro Sawayamab and Seiji Niikurab
  • a Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan b Sinloihi Co., Ltd., 2-19-12 Dai, Kamakura 247-8550, Japan
Abstract
YVO4:Bi3+,Eu3+ nanophosphor is prepared from sodium orthovanadate and nitrates of yttrium, bismuth, and europium in a polyol solvent of diethylene glycol at 160 degrees C. The photoluminescence (PL) intensity of the nanophosphor is enhanced by a factor of 3.3 after silica coating via reverse micelle method. The gradual increase in the PL intensity is observed under the continuous excitation irrespective of silica coating. This increase in the PL intensity is attributed to the photooxidation of V4+ to V5+, as confirmed by electron spin resonance spectroscopy. Finally, a highly luminescent and photostable nanophosphor can be prepared by combination of photooxidation pre-treatment and silica coating.

Keywords: YVO4:Bi3+,Eu3+; Nanophosphor; Polyol synthesis; Silica coating; Photostability

This Article

  • 2013; 14(S1): 18-21

    Published on Mar 31, 2013