Influence of niobium doping on phase composition and defect-mediated photoluminescence properties of Eu3+-doped TiO2 nanopowders synthesized in Ar/O2 thermal plasma

Chenning Zhang, Tetsuo Uchikoshi, Ji Guang Li, Takayuki Watanabe, Takamasa Ishigaki

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)

抄録

Nb5+:Eu3+-codoped TiO2 nanopowders for chemical composition adjustment have been synthesized via Ar/O2 radio-frequency thermal plasma. X-ray diffraction (XRD) results reveal that all the resultant powders exhibited mixture polymorphs of anatase (mean size: ∼45 nm) as the major phase and rutile (mean size: ∼71 nm). Rutile formation was promoted by the Eu3+ doping but suppressed by the Nb5+ addition. Combined observation using FE-SEM and TEM indicates that all the plasma-synthesized powders had a majority of facet-shaped particles (several nanometers) and a small proportion of nearly spherical crystals (∼150 nm). For the defect-mediated photoluminescence (PL) emission through the energy transfer from the TiO2 host to the Eu3+ activator, the PL intensity originating from the 5D07F2 electronic transition weakened but that from the 5D07F1 electronic transition strengthened with increasing Nb5+ content. This may be a result of the decrease in the oxygen vacancy defects in the TiO2 host lattice, as revealed by the joint means of UV-vis absorption spectra and excitation and emission spectra.

本文言語英語
ページ(範囲)8944-8951
ページ数8
ジャーナルJournal of Alloys and Compounds
509
36
DOI
出版ステータス出版済み - 9月 8 2011
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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