Abstract

A generalized master equation approach to triplet exciton motion in molecular solids is used to analyse coherence in the transport via changes in phase lag of periodic delayed fluorescence signals due to triplet-triplet annihilation in crystals under space and time periodic excitation. Coherence effects can lead to increases, as large as = 100%, in the measurable effects due to motion as compared to those for diffusive transport. The method should be considered as the first choice for detection of coherence in triplet transport via delayed fluorescence.

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