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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Electronic and Optical Properties of Organic Systems II

CPP 7.6: Vortrag

Montag, 22. März 2010, 15:15–15:30, H39

On the chain-length dependence of Förster energy transfer for conjugated oligomers — •Rodrigo Queiroz de Albuquerque and Anna Köhler — University of Bayreuth, Physics Department, Universitätsstr. 30, 95440 Bayreuth, Germany.

Energy transfer systems comprising donor-acceptor molecules have been succesfully described using the Förster theory, which uses the Point-Dipole Approximation, PDA. However, for organic semiconductors containing extended chromophores rather small donor-acceptor distances are frequently found, and the PDA is well known to fail in correctly describing the energy transfer process. Here we report a combined experimental and theoretical study of energy transfer systems containing oligofluorenes with different conjugated chain lengths as donors and an anthracene derivative as acceptor. Blends with different amounts of donor and acceptor are investigated by means of steady-state and time-resolved spectroscopy, and the PDA is used to calculate energy transfer parameters. Our aim is also to examine the validity of the PDA in the present case, as well as to discuss the influence of the conjugated chain length of the oligofluorenes on the photophysics of the donor-acceptor systems described here.