Dependence of the kinetics of sensitized phosphorescence (SP) of 1,3,5-triphenylbenzene (1,3,5-TPB) on the concentration of the energy donor – benzophenone (BP) – is studied in toluene at 77 K. An increase in the SP decay rate of 1,3,5-TPB with concentration is established. It is demonstrated that the reason for the increase in the decay rate is the increased radiative deactivation rate constant of triplet excitations caused by exchange interactions. The coefficient characterizing the exponential dependence of the radiative deactivation rate constant for triplet excitations of 1,3,5-TPB on the intermolecular distance in the donor-acceptor pair is determined.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 88–90, November, 2011.
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Suraeva, E.Y., Tishchenko, A.B., Deryabin, M.I. et al. Influence of the donor concentration on the decay kinetics of sensitized phosphorescence of 1,3,5-triphenylbenzene in toluene at 77 K. Russ Phys J 54, 1272–1275 (2012). https://doi.org/10.1007/s11182-012-9741-5
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DOI: https://doi.org/10.1007/s11182-012-9741-5