Structure and optical properties of (Gd,Eu)F3-nanocrystallized sol-gel silica films

Shinobu Fujihara, Shinnosuke Koji, Toshio Kimura

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Transparent, luminescent sol-gel silica films were fabricated on the basis of a SiO2-(Gd,Eu)F3 nanocomposite structure, in which (Gd,Eu)F3 nanocrystals were dispersed in a silica matrix. The films were coated on silica glass substrates at low temperatures of 300-500°C using trifluoroacetic acid as a fluorine source. Doping Eu3+ ions into the films led to narrow emission lines upon ultraviolet (UV) excitation, indicating that Eu3+ was selectively incorporated into the GdF 3 or GdOF nanocrystals. While magnetic dipole 5D 07F1 transitions were dominant in the SiO2-(Gd,Eu)F3 films that were heat-treated at 300 or 400°C, forced electric dipole 5D07F2 transitions had a higher probability in the SiO 2-(Gd,Eu)OF film that was heat-treated at 500°C. The efficiency of the UV light excitation at 274 and 256 nm was promoted by the energy transfer from Gd3+ to Eu3+ and the charge transfer from O 2- to Eu3+ in photoluminescence, respectively.

Original languageEnglish
Pages (from-to)1331-1335
Number of pages5
JournalJournal of Materials Chemistry
Volume14
Issue number8
DOIs
Publication statusPublished - 2004 Apr 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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