Oxyfluoride glass-ceramic thin films of nominal 90SiO2· 10(Ba1-x Eu x )MgF4 compositions were prepared by sol-gel method starting from mixtures of metal trifluoroacetates and silicon alkoxide precursor solutions. Films were deposited on silica glass substrates by spin-coating and heating at 750°C. Eu2+ ions were preferentially incorporated into BaMgF4 nanoparticles, which were dispersed in the silica glass matrix. The films exhibited broad-band blue photoluminescence (PL) in response to the ultraviolet light excitation. Addition of N,N-dimethylformamide to starting coating solutions resulted in a porous microstructure of the heat-treated films. Efficient UV excitation was promoted due to the Rayleigh scattering in the porous films; thereby the PL emissions could be strongly enhanced.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry