The manifestation of spin-selectivity of the singlet exciton decay into a pair of triplets in the kinetics of the exciton decay in rubrene films

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Abstract

The kinetics of singlet fission (SF) (i.e. spontaneous splitting of the excited singlet state into a pair of triplet (T) excitons (TT-pair)) is known to be be essentially affected by TT-annihilation (TTA), which manifests in magnetic field effects on the TTA and, in particular, in the magnetic-field dependence of the SF-kinetics. In this work, within the two-state model (TSM), the method of treating the magnetic field effects on the SF-kinetics, which allows for the correct description of the manifestation of stochastic migration of Texcitons assuming that the manifestation results from transition from two states of coupled and freely diffusing T-excitons. Within the TSM the analytical expression for the magnetic-field-dependent part of the SF-kinetics is derived. This expression is applied to the analysis of the SF-kinetic measured in amorphous rubrene films in the absence magnetic field and in the field B = 8 kGs.

About the authors

A. I. Shushin

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Author for correspondence.
Email: shushin@chph.ras.ru
Russian Federation, Moscow

S. Ya. Umanskii

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: shushin@chph.ras.ru
Russian Federation, Moscow

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