Abstract
The manifestation of short-time (geminate) and long-time (bimolecular) stages of diffusion-controlled triplet–triplet annihilation (TTA) in the kinetics of singlet fission (SF) (i.e. splitting of the excited singlet state S1∗ into a pair of T-excitons) in molecular organic semiconductors are analyzed in detail. In this analysis, the short- and long-time parts of the SF-kinetics (kinetics of fluorescence It from S1∗-state), are assumed to be governed by geminate and bimolecular TTA, respectively. Within the analysis, the analytical formula is derived, which is shown to fairly accurately describe the experimental SF-kinetics in the wide range of times.
Published Version
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