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Synthesis improvement of Yb3+-activated SnO2 nanocrystals
|Emanuela Callone 1, Giovanni Carturan 1, Yoann Jestin 2, Maurizio Ferrari 2|
1. Department of Material Engineering and Industrial Tecnology, University of Trento (DIMTI), v. Mesiano 77, Trento 38100, Italy
Rare-earth doping of nanocrystalline oxides is a current topic of interest for opto-electronic application. To achieve maximum homogeneity and solubility of the dopant ion in the host structure, various processes have been proposed. On this regard, SnO2 nanocrystals, where the band gap energy is blue-shifted in respect to bulk SnO2, are attractive for rare earth ion activation, but the solid state solubility of rare earth ion represents a serious limitation. Besides, solution processing may lead to separation of solid SnO2, leaving in solution most of the rare earth ions. To overcome this, we synthesized Yb3+-doped SnO2 nanocrystals, using the hydrolytic route in the presence of starch as size stabilizer, a process we recently reported for other oxides. Due to small quantum defect and simple electronic structure, Yb3+ shows promising power and efficiency for laser and amplifiers operating around 1 mm. Starting from salt precursors in a starch solution, stable powders with various Yb loads were prepared and characterized by XRD, TEM, ICP and TG-MS techniques. Preliminary assessments of the spectroscopic features of nanocrystals (d <6 nm) were performed by absorption, luminescence, and Raman measurements: The Yb3+ typical absorption peak centred at 977nm and intense 2F5/2® 2F7/2 Yb3+ emission band were observed. Fabrication of silica films loaded with Yb3+-activated SnO2 nanocrystals is in progress.
Presentation: Oral at E-MRS Fall Meeting 2006, Symposium C, by Emanuela Callone
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-12 13:01 Revised: 2009-06-07 00:44