Abstract
The effect of concentration depolarization of donor (D) fluorescence in the presence of an acceptor (A) for two D-A systems differing in critical radii ratio, R 0DA R 0DD , and with constant reduced concentration ratio ( γ D γ A ) was investigated. According to the theory of Loring, Andersen and Fayer, the emission anisotropy measurements confirmed different concentration dependences for both systems at high concentrations. The effect of R 0DA/ R 0DD upon the emission anisotropy changes in the subsystems with weak and strong energy migration, as well as the influence of the correlation effect on the concentration depolarization of fluorescence is discussed. Modern theories of nonradiative excitation energy transport in two-component systems were compared in the light of the experimental data obtained.
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