Two photoenergy conversion modes of YVO<inf>4</inf> Eu<sup>3+</sup> nanoparticles: Photoluminescence and photocatalytic activity

Yusuke Shiraishi, Satoru Takeshita, Tetsuhiko Isobe

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17 Citations (Scopus)

Abstract

In this work we propose Eu<sup>3+</sup>-doped YVO<inf>4</inf> as a model compound of a multimodal photoenergy converter that shows photoluminescence and photocatalytic activity and discuss the relation between these two photoenergy conversion modes. YVO<inf>4</inf>:Eu<sup>3+</sup> nanoparticles with different Eu<sup>3+</sup> concentrations and distributions were prepared by coprecipitation and ion exchange methods. The obtained samples consisted of elliptical nanoparticles of 20-25 nm in mean size, irrespective of the Eu<sup>3+</sup> concentration and distribution. The nanoparticles showed two photoenergy converting functions under UV irradiation: (i) Red photoluminescence corresponding to a 4f → 4f transition of Eu<sup>3+</sup> and (ii) photocatalytic decomposition of methyl orange. Increase in the Eu<sup>3+</sup> concentration increased the photoluminescence quantum yield but decreased the photocatalytic activity. Localizing Eu<sup>3+</sup> ions at the particle surface increased the photocatalytic activity but decreased the photoluminescence quantum yield. These results imply a competitive relation between photoluminescence and photocatalytic activity for the compositional range used in this work.

Original languageEnglish
Pages (from-to)13502-13508
Number of pages7
JournalJournal of Physical Chemistry C
Volume119
Issue number24
DOIs
Publication statusPublished - 2015 Jun 18

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

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