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 language | English |
|---|---|
| Pages (from-to) | 1095-1101 |
| Number of pages | 7 |
| Journal | Journal of Fluorine Chemistry |
| Volume | 132 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2011 Dec |
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Keywords
- Calcium fluoride
- Cerium oxide
- Luminescence
- Solid solution
- Trifluoroacetic acid
ASJC Scopus subject areas
- Biochemistry
- Inorganic Chemistry
- Organic Chemistry
- Physical and Theoretical Chemistry
- Environmental Chemistry
Cite this
Synthesis and luminescent properties of rare-earth-doped CeO 2-CaF2 solid solutions via chemical solution routes. / Fujihara, Shinobu; Sato, Hiroki.
In: Journal of Fluorine Chemistry, Vol. 132, No. 12, 12.2011, p. 1095-1101.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and luminescent properties of rare-earth-doped CeO 2-CaF2 solid solutions via chemical solution routes
AU - Fujihara, Shinobu
AU - Sato, Hiroki
PY - 2011/12
Y1 - 2011/12
N2 - 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.
AB - 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.
KW - Calcium fluoride
KW - Cerium oxide
KW - Luminescence
KW - Solid solution
KW - Trifluoroacetic acid
UR - http://www.scopus.com/inward/record.url?scp=80053573591&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80053573591&partnerID=8YFLogxK
U2 - 10.1016/j.jfluchem.2011.06.026
DO - 10.1016/j.jfluchem.2011.06.026
M3 - Article
AN - SCOPUS:80053573591
VL - 132
SP - 1095
EP - 1101
JO - Journal of Fluorine Chemistry
JF - Journal of Fluorine Chemistry
SN - 0022-1139
IS - 12
ER -