Energy migration and transfer between chromophores embedded in Gaussian space

Abstract

We have used a Monte Carlo method to investigate energy migration and transfer between chromophores embedded in Gaussian space. In using this method we have obtained fluorescence quantum yields, fluorescence depolarization, and the respective decay profiles of donor fluorescence. It was shown that all photophysical observables are dependent upon the number of donor and acceptor chromophores and upon the Förster radii ratio. The latter feature is particularly interesting, and it indicates the existence of correlations between donor and acceptor chromophores. It was shown that the excitation of the donor chromophore at the origin leads to different values of observables, in comparison with an excitation of a randomly selected donor chromophore. The results presented show the importance of the averaging procedures needed to be developed while dealing with specific distribution functions, as, for example, in the case of energy migration and trapping in aromatic polymers and copolymers.