Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.28: Poster

Tuesday, March 17, 2020, 14:00–16:00, P1A

Photophysics of Pentacene Blends with Weakly Interacting Spacer Molecules — •Frederik Unger, Clemens Zeiser, and Katharina Broch — Institute of Applied Physics, University of Tübingen, Germany

One of the main interests in pentacene (PEN) arises from its ability to undergo singlet fission (SF), a process where absorption of a single photon results in the generation of two triplet excitons [1]. Although being used as a prototypical model system, the details of the SF mechanism in PEN are still not fully understood. It is therefore crucial to understand and enable controlled tuning of the absorption behavior of PEN.

We mixed PEN with weakly interacting spacer molecules ([5]-phenacene [2] and [6]-phenacene) and investigated the PEN Davydov splitting as function of mixing ratio. Subsequent exciton behavior was investigated by temperature dependent photoluminescence spectroscopy. The comparison of the two systems is of special interest as the chemical and physical properties for both spacer molecules are similar, except for the difference in molecule length.

[1] Smith, M. B., and Michl, J., Chemical Reviews 110 (2010), [2] Dieterle, J., et al., J. Phys. Chem. C (2015).