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Energy transfer from Tb3+ to Eu3+ ions sorbed on SrTiO3 surface

Abstract : The energy transfer at room temperature between Tb3+ and Eu3+ ions sorbed onto SrTiO3 powders is investigated, using Time-Resolved Laser-induced Fluorescence Spectroscopy (TRLFS). Several published works deal with the energy transfer between two lanthanide ions in co-doped matrices but it is the first time that transfer processes between two lanthanide ions sorbed on a solid surface is reported. The results show that the energy transfer between sorbed Tb3+ and Eu3+ ions on strontium titanate is a non-radiative process and follows a dipole-dipole type interaction. Moreover, the higher the acceptor ions Eu3+ concentration, the more efficient the energy transfer. It is shown that no energy migration between the Tb3+ donor ions occurs. A formalism based on the model of Inokuti-Hirayama is used and allows one to fit the non-exponential Tb3+ fluorescence decay. It is thus possible to evaluate the critical radius (R0) of the influence sphere of the sorbed Tb3+ ions. According to the previous works, two sorption sites are considered for the sorbed rare-earth. The calculated radii are similar to those obtained for other couples of donor-acceptor lanthanide ions reported in the literature.
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Submitted on : Friday, January 25, 2013 - 4:35:16 PM
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G. García-Rosales, Florence F. Mercier-Bion, R. Drot, G. Lagarde, J. Roques, et al.. Energy transfer from Tb3+ to Eu3+ ions sorbed on SrTiO3 surface. Journal of Luminescence, Elsevier, 2011, 132, pp.1299-1306. ⟨10.1016/j.jlumin.2011.11.034⟩. ⟨in2p3-00781216⟩



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