Rostock 2019 – scientific programme
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MO: Fachverband Molekülphysik
MO 21: Coupled Systems
MO 21.2: Talk
Thursday, March 14, 2019, 14:30–14:45, S HS 001 Biologie
Exciton migration in multi-stranded J-type aggregates — •Chris Rehhagen1, Franziska Fennel1, Stefanie Herbst2, Frank Würthner2, and Stefan Lochbrunner1 — 1Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23, 18059 Rostock — 2Institut für Organische Chemie & Center for Nanosystems Chemistry, Universität Würzburg, Am Hubland, 97074 Würzburg
Understanding the transport mechanisms of electronic excitations in coupled molecular systems is the basis for their application in light harvesting and opto-electronic devices. The exciton transfer properties depend pivotal on the supramolecular structure. Herbst et. al. reported recently a series of perylene bisimides dyes self-assembling into multi-stranded (two to four) J-type aggregates [1]. These aggregates are an ideal model system to study the impact of structural modifications onto the exciton transfer distances. We determine the exciton mobility for these aggregates by analyzing the dynamics associated with exciton-exciton annihilation [2]. Therefore energy dependent pump-probe spectroscopy is applied and a one-dimensional diffusion model is fitted to the obtained data. We compare the exciton mobilities of the different samples with respect to their supramolecular structure. Our results imply that such PBI-aggregates and their molecular engineering are promising for further applications in photonics.
[1] Herbst et. al.,Nat. Commun., 9 (2018), 2646.
[2] Wolter et. al.,J. Phys. B: At. Mol. Opt. Phys. 50 (2017), 184005.