Migration of excitation energy in model systems

Endre Lehoczki, E. Balint, J. Hevesi

Sergey A. Bagnich, A. V. Dorokhin

R. Twardowski, Leszek Kułak

John Frederick Allen, Michael A. Harrison

N. A. Glushkov

The kinetics of migration-accelerated energy transfer is studied in systems based on a massive crystal and a sample consisting of spherical nanoparticles up to and including four or five orders of magnitude of the kinetic expulsion depth for the case of donor excitation by a short (τpulse < τ D ) pulse under the action of a multipole mechanism of donor-donor and donor-acceptor energy transfer. The susceptibility of the chosen systems to the implementation of the “jump” mechanism of excitation transfer in them is estimated. It is shown that the nonstationary mechanism of excitation transfer is implemented in the chosen systems based on a sample consisting of nanoparticles.

Tasoltan T. Basiev, Yu. K. Voron’ko, T G Mamedov +1 more

The time and temperature dependences of the probability of deactivation of the excited state of the Yb 3+ ions in mixed yttrium-ytterbium garnets of various compositions were investigated in the temperature range 1.7–300°K. An analysis indicated that these dependences were governed by the excitation energy migration, which was the "bottleneck" in the process of nonradiative deactivation of the excited state. A strong rise (by more than an order of magnitude) of the migration probability was observed when the temperature was raised from 1.7 to 4.2°K. The diffusion theory, applicable to migration processes in the case of homogeneous broadening of spectral lines, was generalized to inhomogeneous broadening. The theoretical results were in good agreement with the experimental data.