Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.52: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Singlet And Triplet Dynamics of Covalently Bound Ditetracene in Various Environments — •Maximilian Frank1, Ulrich Müller1, Lena Roos2, Anke Krueger2, and Jens Pflaum1,3 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Institute of Organic Chemistry, Julius Maximilian University of Würzburg, 97074 Würzburg — 3Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
Singlet fission significantly affects the performance of many organic photovoltaic cells and light-emitting diodes. In this process a singlet state decays into two triplet states which strongly depends on the relative orientation of the participating chromophores. As tetracene constitutes a model system showing efficient, thermally activated singlet fission, we study covalently bound ditetracene to determine the influence of the rotation angle between the two tetracene molecules on this process. Therefore, ditetracene and tetracene doped into different host systems like a disordered PMMA matrix or a single anthracene crystal are optically analysed by means of photon-correlation studies together with lifetime measurements at room temperature. By comparing this data with that of a tetracene single crystal or the molecules in solution we are able to identify two different excitonic species in ditetracene and to show how the influence of the environment and temperature affects their photophysical characteristics such as the spectral intensity distribution, fluorescence lifetime and quantum efficiency. This project was funded by the DFG in the framework of the GRK 2112.