Synthesis and luminescent properties of rare-earth-doped CeO 2-CaF2 solid solutions via chemical solution routes

Shinobu Fujihara, Hiroki Sato

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

CeO2-CaF2 solid solutions were synthesized by a chemical solution method starting from metal acetates, trifluoroacetic acid as a fluorine source, and anhydrous ethanol as a solvent. Precursor gels, which were obtained by drying the resultant ethanolic solution at 110 °C, were heat-treated at a temperature in the range 400-1000 °C in air to obtain powdery products. Elemental analysis by energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy revealed that heating products actually contained cerium, calcium, oxygen, and fluorine. According to X-ray diffraction analysis, possible reaction pathways under high-temperature treatments were considered as initial formation of fluorides (CeF3 and CaF 2), subsequent oxidation of Ce3+ to Ce4+ in air, and final conversion to fluorite-type Ce-Ca-O-F solid solutions. Doping of Eu3+ or Sm3+ ions in the solid solutions led to occurrence of their characteristic photoluminescence due to intra-configurational f-f electronic transitions. Photo-excitation was achieved by irradiation with near ultraviolet light mainly through charge transfer from O2- to Ce 4+ in the solid solutions and subsequent energy transfer to the doped ions. Spectral structures of photoluminescence suggested the occupation of Eu3+ or Sm3+ in Ce4+ sites with inversion symmetry in the solid solutions.

Original languageEnglish
Pages (from-to)1095-1101
Number of pages7
JournalJournal of Fluorine Chemistry
Volume132
Issue number12
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • Calcium fluoride
  • Cerium oxide
  • Luminescence
  • Solid solution
  • Trifluoroacetic acid

ASJC Scopus subject areas

  • Biochemistry
  • Environmental Chemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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