Abstract
Spectral properties and morphologies of 1,1′-disulfobutyl-3,3′-diethyl-5,5′,6,6′-tetrachlorobenzimidazolylcarbo-cyanine (TDBC) J-aggregates formed in two different types of polymer films (neutral spin-coated and charged layered) were studied using steady-state, picosecond, and femtosecond spectroscopies as well as optical and atomic force microscopies. It was found that the J-aggregates adopt different morphologies in the films: quasi one-dimensional rod-like in the spin-coated films and two-dimensional island-like in the layered films. The TDBC J-aggregates exhibit very similar absorption and fluorescence spectra in different films, but their fluorescence lifetimes and quantum yields differ strongly (∼4% for spin-coated films and ∼0.5% for layered films). By pump-probe spectroscopy, three different contributions to the population dynamics and relaxation to lower lying levels are identified with exciton–exciton annihilation dominating the observed kinetics. Low-temperature experiments reveal strong excito...
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