Year: 2009
Type: article
Abstract: A systematic study of the photoluminescence spectra of samarium-doped crystalline TiO 2 was conducted within the temperature range 10–300 K in order to reveal the energy levels of the trivalent impurity ion in different phases of titania. The sol–gel route was used to prepare Sm-doped TiO 2 powders. The nanocrystalline anatase phase was obtained by annealing up to 800 °C, whereas the rutile phase was developed by annealing above 1000 °C. Crystal field calculations of Sm 3+ energy levels in the two phases of TiO 2 (anatase and rutile) were performed for the first time. The obtained set of energy levels assuming positioning of the Sm 3+ ions in regular TiO 2 lattice sites was consistent with the experimental results. The effect of the different phases of titania on the impurity is discussed.
Authors: V Kiisk, V Reedo, M Karbowiak, M G Brik, I Sildos
Institutions: University of Tartu, University of Wrocław
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: bronze
Funder: Eesti Teadusfondi
OpenAlex ID: W1998559844