Low-temperature quenching of one-dimensional localised Frenkel excitons

Details Low-temperature quenching of one-dimensional localised Frenkel excitons Low-temperature quenching of one-dimensional localised Frenkel excitons

2002-09-04

arxiv.org/abs/cond-mat/0209083v2

Chem. Phys. Lett. 371, 417-425 (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 3 figures, accepted to Chem. Phys. Lett

Scientific paper

We present a theoretical analysis of low-temperature quenching of one-dimensional Frenkel excitons that are localised by moderate on-site (diagonal) uncorrelated disorder. Exciton diffusion is considered as an incoherent hopping over localization segments and is probed by the exciton fluorescence quenching at point traps. The rate equation is used to calculate the temperature dependence of the exciton quenching. The activation temperature of the diffusion is found to be of the order of the width of the exciton absorption band. We demonstrate that the intra-segment scattering is extremely important for the exciton diffusion. We discuss also experimental data on the fast exciton-exciton annihilation in linear molecular aggregates at low temperatures.

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