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Journal of Luminescence 132 (2012) 1299-1306
Energy transfer from Tb(3+) to Eu(3+) ions sorbed on SrTiO(3) surface
G. García-Rosales1, F. Mercier-Bion1, R. Drot1, G. Lagarde1, J. Roques1, E. Simoni1

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay