Sol-gel preparation and luminescent properties of CeO2: Ln (Ln = Eu3+ and Sm3+) thin films

Masashi Oikawa, Shinobu Fujihara

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

New transparent CeO2:Ln (Ln = Eu3+ or Sm3+) thin-film phosphors have been fabricated by a sol-gel method. The CeO2:Ln films with the Ln concentrations of 1 at.% showed the strongest photoluminescence (PL) upon ultraviolet (UV) light excitation. At higher Ln concentrations, the PL intensity decreased because of the nonradiative energy transfer. For Eu3+ ions doped in the CeO2 lattice with inversion symmetry, an orangey red emission due to a magnetic-dipole 5 D07F1 transition (591 nm) was dominant when excited at a wavelength of 340 nm. In contrast, much stronger orange emissions (573 nm) due to 4G5/26H5/2 were observed for Sm3+ ions. Apparently, the Eu3+ and the Sm3+ ions had different efficiencies of the excitation through the energy transfer from the "Ce4+-O2-" charge transfer state induced by the UV irradiation.

Original languageEnglish
Pages (from-to)2921-2924
Number of pages4
JournalJournal of the European Ceramic Society
Volume25
Issue number12 SPEC. ISS.
DOIs
Publication statusPublished - 2005

Fingerprint

Sol-gels
Ions
Thin films
Energy transfer
Photoluminescence
Phosphors
Sol-gel process
Charge transfer
Irradiation
Wavelength
Ultraviolet Rays

Keywords

  • CeO
  • Films
  • Optical properties
  • Phosphors
  • Sol-gel processes

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Sol-gel preparation and luminescent properties of CeO2 : Ln (Ln = Eu3+ and Sm3+) thin films. / Oikawa, Masashi; Fujihara, Shinobu.

In: Journal of the European Ceramic Society, Vol. 25, No. 12 SPEC. ISS., 2005, p. 2921-2924.

Research output: Contribution to journalArticle

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title = "Sol-gel preparation and luminescent properties of CeO2: Ln (Ln = Eu3+ and Sm3+) thin films",
abstract = "New transparent CeO2:Ln (Ln = Eu3+ or Sm3+) thin-film phosphors have been fabricated by a sol-gel method. The CeO2:Ln films with the Ln concentrations of 1 at.{\%} showed the strongest photoluminescence (PL) upon ultraviolet (UV) light excitation. At higher Ln concentrations, the PL intensity decreased because of the nonradiative energy transfer. For Eu3+ ions doped in the CeO2 lattice with inversion symmetry, an orangey red emission due to a magnetic-dipole 5 D0 → 7F1 transition (591 nm) was dominant when excited at a wavelength of 340 nm. In contrast, much stronger orange emissions (573 nm) due to 4G5/2 → 6H5/2 were observed for Sm3+ ions. Apparently, the Eu3+ and the Sm3+ ions had different efficiencies of the excitation through the energy transfer from the {"}Ce4+-O2-{"} charge transfer state induced by the UV irradiation.",
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N2 - New transparent CeO2:Ln (Ln = Eu3+ or Sm3+) thin-film phosphors have been fabricated by a sol-gel method. The CeO2:Ln films with the Ln concentrations of 1 at.% showed the strongest photoluminescence (PL) upon ultraviolet (UV) light excitation. At higher Ln concentrations, the PL intensity decreased because of the nonradiative energy transfer. For Eu3+ ions doped in the CeO2 lattice with inversion symmetry, an orangey red emission due to a magnetic-dipole 5 D0 → 7F1 transition (591 nm) was dominant when excited at a wavelength of 340 nm. In contrast, much stronger orange emissions (573 nm) due to 4G5/2 → 6H5/2 were observed for Sm3+ ions. Apparently, the Eu3+ and the Sm3+ ions had different efficiencies of the excitation through the energy transfer from the "Ce4+-O2-" charge transfer state induced by the UV irradiation.

AB - New transparent CeO2:Ln (Ln = Eu3+ or Sm3+) thin-film phosphors have been fabricated by a sol-gel method. The CeO2:Ln films with the Ln concentrations of 1 at.% showed the strongest photoluminescence (PL) upon ultraviolet (UV) light excitation. At higher Ln concentrations, the PL intensity decreased because of the nonradiative energy transfer. For Eu3+ ions doped in the CeO2 lattice with inversion symmetry, an orangey red emission due to a magnetic-dipole 5 D0 → 7F1 transition (591 nm) was dominant when excited at a wavelength of 340 nm. In contrast, much stronger orange emissions (573 nm) due to 4G5/2 → 6H5/2 were observed for Sm3+ ions. Apparently, the Eu3+ and the Sm3+ ions had different efficiencies of the excitation through the energy transfer from the "Ce4+-O2-" charge transfer state induced by the UV irradiation.

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