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

Masashi Oikawa, Shinobu Fujihara

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32 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 Jan 1

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Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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