Erbium-Doped Tin-Silicate Sol-Gel-Derived Glass-Ceramic Thin Films: Effect of Environment Segregation on the Er 3+ Emission

A new class of glass-ceramic nanocomposite systems with a uniform distribution of SnO2 nanocrystals dis-persed within an amorphous silica phase is fabricated in the form of thin films by using sol-gel processing. In this work, experiments with (100-x)SiO 2-xSnO 2 nanocomposite thin films with (x=25 and 30 mol%) doped with Er 3+ ions (concentrations of 0.5, 1 and 2 mol%) are presented. The focus has been both to determine the effect of rare-earth doping on the growth of SnO2 nanocrystals as well as the distribution of the Er3+ ionswithin the ceramic structure. Vibrational spectroscopic assessments have proven the glass-ceramic nature ofthe samples. EXAFS and photoluminescence spectra show that the rare-earth ions exist in both amorphousand crystalline phases. Moreover an energy transfer from SnO2nanocrystals to erbium ions on excitation at 351 nm is demonstrated.