26 September 2016 Visualization of molecular excitons diffusion
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Abstract
Small organic molecules of the push-pull architecture are rapidly gaining their status in the organic electronics applications. In densely packed molecular films, both intra- and intermolecular interactions play an essential role for the device performance. Here we study two different molecules, a highly symmetric star-shaped one and its newly synthesized single arm analogue, for their photophysical properties. Both chromophores were dissolved in a solid matrix at different concentrations to vary their separation and therefore intermolecular coupling. We show that in both molecules the population relaxation accelerates by more than a factor of 10 at shorter intermolecular distances due to self-quenching thereby reducing the exciton survival time. The transient anisotropy dynamics are also quite similar, with their substantial acceleration at shorter interchromophore distances due to exciton diffusion caused by the Förster-like resonance energy transfer. However, the anisotropy values are noticeably lower for the star-shaped molecule because of intramolecular mixing of different polarization states. Finally, a model is presented that accounts for the observed results.
Conference Presentation
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Evgeniia Salamatova, Oleg V. Kozlov, Yuriy N. Luponosov, Alexander N. Solodukhin, Viktoria Y. Toropynina, Sergei A. Ponomarenko, Maxim S. Pshenichnikov, "Visualization of molecular excitons diffusion", Proc. SPIE 9923, Physical Chemistry of Interfaces and Nanomaterials XV, 99230K (26 September 2016); doi: 10.1117/12.2237620; https://doi.org/10.1117/12.2237620
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