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

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)8944-8951
Number of pages8
JournalJournal of Alloys and Compounds
Volume509
Issue number36
DOIs
Publication statusPublished - Sep 8 2011
Externally publishedYes

Fingerprint

Niobium
Plasma Gases
Phase composition
Photoluminescence
Doping (additives)
Plasmas
Powders
Defects
Oxygen vacancies
Polymorphism
Energy transfer
Titanium dioxide
Absorption spectra
Transmission electron microscopy
X ray diffraction
Crystals
Scanning electron microscopy
Chemical analysis
Hot Temperature
titanium dioxide

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Influence of niobium doping on phase composition and defect-mediated photoluminescence properties of Eu3+-doped TiO2 nanopowders synthesized in Ar/O2 thermal plasma. / Zhang, Chenning; Uchikoshi, Tetsuo; Li, Ji Guang; Watanabe, Takayuki; Ishigaki, Takamasa.

In: Journal of Alloys and Compounds, Vol. 509, No. 36, 08.09.2011, p. 8944-8951.

Research output: Contribution to journalArticle

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abstract = "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 5D0 → 7F2 electronic transition weakened but that from the 5D0 → 7F1 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.",
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