Excited state dynamics of oligothiophenes studied by transient pump-probe spectroscopy

The primary excitations and their deactivation channels in oligothiophenes are discussed based on experimental results from time resolved spectroscopy with 200 fs time resolution. Molecules in solution and different morpholog y films are considered, in order to deduce the effect of molecular aggregat ion onto the nature of the excited states. A comprehensive interpretation o f the rich phenomenology observed upon changing the aggregation state is pr oposed. (C) 2001 Elsevier Science B.V. All rights reserved.