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Issue 8, 2004
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Structure and optical properties of (Gd,Eu)F3-nanocrystallized sol–gel silica films

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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 GdF3 or GdOF nanocrystals. While magnetic dipole 5D07F1 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 SiO2–(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 O2− to Eu3+ in photoluminescence, respectively.

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

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Publication details

The article was received on 30 Oct 2003, accepted on 24 Feb 2004 and first published on 17 Mar 2004

Article type: Paper
DOI: 10.1039/B313784H
J. Mater. Chem., 2004,14, 1331-1335

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

    S. Fujihara, S. Koji and T. Kimura, J. Mater. Chem., 2004, 14, 1331
    DOI: 10.1039/B313784H

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