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The size dependent exciton dynamics of one-dimensional aggregates ofsubstituted perylene bisimides are studied by ultrafast transient absorptionspectroscopy and kinetic Monte-Carlo simulations in dependence on thetemperature and the excitation density. For low temperatures the aggregates canbe treated as infinite chains and the dynamics is dominated by diffusion drivenexciton-exciton annihilation. With increasing temperature the aggregatesdecompose into small fragments consisting of very few monomers. This scenariois also supported by the time dependent anisotropy deduced from polarizationdependent experiments.

Size dependent exciton dynamics in one-dimensional perylene bisimide aggregates