Berlin 2005 – scientific programme

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MO: Molekülphysik

MO 43: Ultrafast Processes

MO 43.6: Talk

Tuesday, March 8, 2005, 17:45–18:00, HU 2091

Energy transport and excited state dynamics of dyes in matrices — •Martin Schlosser and Stefan Lochbrunner — LS für BioMolekulare Optik, Ludwig-Maximilians-Universität München

Supramolecular structures of interacting molecules are promising candidates for electronic nanodevices and functional materials. In such systems energy and charge transport are governed by the excited state dynamics of the participating compounds and the interaction between neighboring molecules. We investigate the interplay between excited state dynamics and transport properties by looking at the energy migration between Perylene Orange and Perylene Red dye molecules incorporated at high concentrations in thin layers of PMMA. The photoinduced dynamics is characterized by broadband pump-probe spectroscopy with 100 fs time resolution and compared to the dynamics at low concentrations in solution. The excited state absorption is disentangled from stimulated emission and bleaching contributions by its dependence on the polarization. To identify the mechanisms responsible for the observed dynamics the decay of the anisotropy and the dependence on the excitation energy density (fluence) is investigated.