Energy transfer from the host to Er3+ dopants in semiconductor SnO2 nanocrystals segregated in sol–gel silica glasses
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Undoped and Er3+-doped glass–ceramics of composition (100−x)SiO2–xSnO2, with x = 5 or 10 and with 0.4 or 0.8 mol% of Er3+ ions, were synthesised by thermal treatment of precursor sol–gel glasses. Structural studies were developed by X-Ray Diffraction. Wide band gap SnO2 semiconductor quantum-dots embedded in the insulator SiO2 glass are obtained. The mean radius of the SnO2 nanocrystals, ranging from 2 to 3.2 nm, is comparable to the exciton Bohr radius. The luminescence properties have been analysed as a function of sample composition and thermal treatment. The results show that Er3+ ions are partially partitioned into the nanocrystalline phase. An efficient UV excitation of the Er3+ ions by energy transfer from the SnO2 nanocrystal host is observed. The Er3+ ions located in the SnO2 nanocrystals are selectively excited by this energy transfer mechanism. On the other hand, emission from the Er3+ ions remaining in the silica glassy phase is obtained by direct excitation of these ions.
KeywordsNanostructured materials sol–gel glass–ceramics Er3+ Luminescence Synthesis Thermal treatment
- Brinker CJ, Sherer GW (1990) Sol–Gel Science: The Physics and Chemistry of Sol–Gel Processing. Academic Press, NYGoogle Scholar
- del-Castillo J, Yanes AC, Méndez-Ramos J, Rodríguez VD Luminescence of nanostructured SnO2–SiO2 glass–ceramics prepared by sol–gel method. J Nanosci Nanotechnol (submitted)Google Scholar