Polyol synthesis of YVO4:Bi3+,Eu3+ nanophosphors and effect of silica coating on their photoluminescence properties

Hiroki Hara, Satoru Takeshita, Tetsuhiko Isobe, Tomohiro Sawayama, Seiji Niikura

Research output: Contribution to journalArticle

5 Citations (Scopus)

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°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.

Original languageEnglish
Pages (from-to)s18-s21
JournalJournal of Ceramic Processing Research
Volume14
Issue numberSUPPL.1
Publication statusPublished - 2013 Jul 1

Keywords

  • Eu
  • Nanophosphor
  • Photostability
  • Polyol synthesis
  • Silica coating
  • YVO:Bi

ASJC Scopus subject areas

  • Ceramics and Composites

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