Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Posters 2: Time Resolved Spectroscopy
MO 18.6: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Foyer LLM
Exciton Dynamics of Carbocyanine J-Aggregates in Polymer Films — •Steffen Wolter1, Alexander V Sorokin2, and Stefan Lochbrunner1 — 1Institut für Physik, Universität Rostock, 18051 Rostock, Germany — 2Institute for Scintillation Materials of NAS of Ukraine, SSI Institute for Single Crystals of NAS of Ukraine, 60 Nauky ave., 61072 Kharkiv, Ukraine
J-aggregates are promising candidates as building blocks for future photonic applications. These supramolecular structures typically feature high quantum yields and exciton mobilities at ambient conditions, although the actual values highly depend on the local environment. J-aggregates in thin polymer films are of particular interest for applications. However, most studies deal with aggregates in solution and the behavior of the aggregates in polymers is insufficiently characterized. In this contribution, the influence of different local environments on the exciton dynamics is investigated by femtosecond pump probe spectroscopy for J-aggregates consisting of the carbocyanine dye 1,1'-disulfobutyl-3,3'-diethyl-5,5',6,6'-tetrachlorobenzimidazolylcarbo-cyanine sodium salt (TDBC). The dye forms J-aggregates in polymer films with optical properties comparable to those in water solutions, however, with a much lower fluorescence quantum yield. The goal is to understand this finding and to learn about the responsible mechanism.