Improvement of the photostability for YVO4:Bi 3+,Eu3+ nanoparticles synthesized by the citrate route

Satoru Takeshita, Tatsuya Watanabe, Tetsuhiko Isobe, Tomohiro Sawayama, Seiji Niikura

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

YVO4:Bi3+,Eu3+ nanophosphor synthesized by the citrate route shows the photobleaching behavior, i.e., the decrease in photoluminescence intensity under the continuous irradiation of excitation light. This photobleaching property is remarkably suppressed by the washing post-treatment combined with centrifugation and the hydrothermal post-treatment. A relation between the fraction of photobleach and the amount of citrate ions coordinating to metallic ions at the surface of nanoparticles verifies that the photobleaching behavior of YVO4:Bi3+,Eu3+ nanophosphor originates from the redox reaction between the citrate ions and V5+ in YVO4 host crystal. The long-term light fastness test reveals that the hydrothermally treated YVO4:Bi 3+,Eu3+ nanophosphor has sufficient photostability for practical use over 15 years outside.

Original languageEnglish
Pages (from-to)323-326
Number of pages4
JournalOptical Materials
Volume33
Issue number3
DOIs
Publication statusPublished - 2011 Jan

Keywords

  • Hydrothermal treatment
  • Nanophosphor
  • Photoluminescence
  • Photostability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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