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Energy transfer from Tb(3+) to Eu(3+) ions sorbed on SrTiO(3) surface

Abstract : The energytransfer at room temperature between Tb3+ and Eu3+ionssorbed onto SrTiO3 powders is investigated, using Time-Resolved Laser-induced Fluorescence Spectroscopy (TRLFS). Several published works deal with the energytransfer between two lanthanide ions in co-doped matrices but it is the first time that transfer processes between two lanthanide ionssorbed on a solid surface is reported. The results show that the energytransfer 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 energytransfer. 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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http://hal.in2p3.fr/in2p3-00701502
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Submitted on : Friday, May 25, 2012 - 3:07:17 PM
Last modification on : Wednesday, September 16, 2020 - 3:59:20 PM

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G. García-Rosales, F. Mercier-Bion, R. Drot, G. Lagarde, J. Roques, et al.. Energy transfer from Tb(3+) to Eu(3+) ions sorbed on SrTiO(3) surface. Journal of Luminescence, Elsevier, 2012, 132, pp.1299-1306. ⟨10.1016/j.jlumin.2011.11.034⟩. ⟨in2p3-00701502⟩

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