(Eu3+-Nb5+)-codoped TiO2 nanopowders synthesized via Ar/O2 radio frequency thermal plasma oxidation processing: Phase composition and photoluminescence properties through energy transfer

C. N. Zhang, J. G. Li, Y. H. Leng, T. Uchikoshi, Takayuki Watanabe, T. Ishigaki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

(Eu3+-Nb5+)-codoped TiO2 nanopowders have been prepared by Ar/O2 radio frequency (RF) thermal plasma oxidizing liquid precursor mists, with various addition contents of dopants (molar ratio of Eu3+:Nb5+ = 1:1). Characterizations have been performed by the combined studies of XRD, TEM, Raman spectra, UV-vis spectroscopy, and excitation and PL spectra. The plasma-generated nanopowders mainly consist of anatase and rutile polymorphs. Doping Nb5+ cannot have appreciable influence on Eu3+ solubility (0.5 at.%) in the TiO2 host lattice, but can significantly inhibit the increase of rutile weight fraction for TiO2. 617 nm PL intensity at 350 nm indirect excitation through energy transfer is considerably weaker than that at 467 nm direct excitation, indicating that a defect state level in the TiO2 host lattice might be lowered below the excited state of Eu3+ by doping Nb5+, which is conceivable from a relatively large amount of oxygen deficiencies yielded in the TiO2 host lattice.

Original languageEnglish
Pages (from-to)3531-3534
Number of pages4
JournalThin Solid Films
Volume518
Issue number13
DOIs
Publication statusPublished - Apr 30 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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