Communications

Specific features of time-dependent effects of triplet–triplet annihilation on the kinetics of singlet fission in molecular semiconductors

A. I. Shushin

N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation

Abstract: The characteristic properties of the effects of migration-controlled triplet–triplet annihilation on the kinetics of singlet fission (the splitting of an excited singlet state S₁* into a pair of triplet excitons) in molecular semiconductors are thoroughly analyzed. The analysis assumes that the short-time and long-time parts of the kinetics, i.e., the kinetics of fluorescence I(t) from the S₁* state, are governed by the corresponding short-time (geminate) and long-time (bulk) annihilation stages. Within the analysis, a simple formula is proposed that accurately describes the experimental singlet-fission kinetics over a wide range of times.

Keywords: singlet fission, triplet excitons, triplet–triplet annihilation, diffusion, fluorescence.

Language: English

DOI: 10.1016/j.mencom.2023.10.044

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