Direct and reverse energy transport in systems of monomers and imperfect traps: Monte Carlo simulations

Abstract

A Monte Carlo simulation of the concentration dependence of the fluorescence quantum yield ŋM and emission anisotropyr M of a system containing dye molecules in the form of monomers M and clusters T (statistical pairs and trimers) playing the role of the imperfect traps for nonradiative excitation energy transfer (NET) has been carried out. The simulation has been made for determined values of Förster critical distancesR 0 (MM) andR 0 (MT) and for several values ofR 0 (TM) andR 0 (TT) , assuming that the energy may be transferred from M(*) to T as well as from T(*) to M (reverse nonradiative energy transfer, RNET). It was shown that the RNET process in the range of high concentrations may strongly change the values ofr M as well as those of ŋM. For emission anisotropyr M an effect of repolarization was observed which decreases rapidly with increasingR 0 (TM) andR 0 (TT) . A very good agreement between the simulation results of ŋM and the theoretical model with no adjustable parameters was found. In the model, the RNET process and influence of correlation between active molecules on energy migration among monomers were taken into account.

Resonance energy transfer between FMN molecules in the presence of dimers: A review

“…(12). The experimental existence of the reverse nonradiative energy transfer and good agreement between the theoretical (RET-HM) and experimental results has been found for the first time in 1987 [121] and the next also confirmed in other works [122,123]. The Bojarski theory has been verified experimentally and confirmed in many papers.…”

Excitation Energy Transport between the Ionic Forms of Rhodamine B in Viscous Solutions

“…Over past several years rapid progress in the theoretical description of excitation energy transport in two-component systems has been made by taking into account not only forward, but also reverse energy transfer [1][2][3][4][5][6][7][8][9]. This effect has been confirmed experimentally in inodel donor-acceptor systems [9][10][11][12][13] as well as in monomer-fluorescent dimer systems [14][15][16].…”

The Influence of Reverse Nonradiative Excitation Energy Transfer on the Fluorescence Spectra of Two-component Fluorescent Solutions

“…In the last decade progress has been made in under standing the mechanism of nonradiative energy trans port in solutions by taking into account the reverse energy transport from the excited acceptors to the energy donors (A* + D -*A + D*) [1][2][3][4][5][6][7][8][9]. The precon dition for this effect is the spectral overlapping be tween the acceptor emission and the donor absorption bands (overlap integral / AD> 0).…”