Size-dependent exciton dynamics in one-dimensional perylene bisimide aggregates

作者：Wolter Steffen; Aizezers Janis; Fennel Franziska; Seidel Marcus; Wuerthner Frank; Kuehn Oliver; Lochbrunner Stefan^*

来源：New Journal of Physics, 2012, 14(10): 105027.

DOI：10.1088/1367-2630/14/10/105027

The size-dependent exciton dynamics of one-dimensional aggregates of substituted perylene bisimides are studied by ultrafast transient absorption spectroscopy and kinetic Monte-Carlo simulations as a function of the excitation density and the temperature in the range of 25-90 degrees C. For low temperatures, the aggregates can be treated as infinite chains and the dynamics is dominated by diffusion-driven exciton-exciton annihilation. With increasing temperature the aggregates dissociate into small fragments consisting of very few monomers. This scenario is also supported by the time-dependent anisotropy deduced from polarization-dependent experiments.

• 出版日期2012-10-29