Transparent oxyfluoride glass-ceramic thin films were prepared using a sol-gel method starting from rare-earth trifluoroacetate/silicon alkoxide solutions. SiO2-LaF3 and SiO2-LaOF glass-ceramics were formed by heating at temperatures of 300°-500°C and 600°-900°C, respectively. Eu3+ activators were successfully incorporated into oxyfluoride crystals, as evidenced by their luminescent properties, such as capability of a charge-transfer (O2--Eu3+) excitation, suppression of a multiphonon relaxation, and occurrence of a cross-relaxation at low Eu3+ concentrations. As a result, the films exhibited strong red emission by ultraviolet excitation. The incorporation supposedly originated from decomposition of the (La,Eu)-trifluoroacetates in the silica-gel matrix.
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2001 Nov|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry