Analysis of the phosphorescent dye concentration dependence of triplet-triplet annihilation in organic host-guest systems

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Abstract

Using a novel method for analyzing transient photoluminescence (PL) experiments, a microscopic description is obtained for the dye concentration dependence of triplet-triplet annihilation (TTA) in phosphorescent host-guest systems. It is demonstrated that the TTA-mechanism, which could be a single-step dominated process or a diffusion-mediated multi-step process, can be deduced for any given dye concentration from a recently proposed PL intensity analysis. A comparison with the results of kinetic Monte Carlo simulations provides the TTA-Förster radius and shows that the TTA enhancement due to triplet diffusion can be well described in a microscopic manner assuming Förster- or Dexter-type energy transfer.
Original languageEnglish
Pages (from-to)221–227
JournalChemical Physics Letters
Volume662
DOIs
Publication statusPublished - 1 Oct 2016

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