SAMOP 2023 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Poster II

MO 13.10: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Implementation of time-correlated single photon counting for studying photo-activated processes in aggregates of organic molecules attached to rare gas clusters — •Aleksandr Demianenko, Moritz Michelbach, Sebastian Hartweg, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany

Collective effects in organic semiconductors affect excited state lifetimes, important for organic optoelectronic and photovoltaic applications. Previous studies addressed radiative and non-radiative decay mechanisms of the processes connected to the collective effects in aggregates of polyacenes attached to the surface of solid Ne and Ar clusters. Fluorescence quantum yield and excited singlet state's lifetime decreased upon increasing sample molecules surface density [1,2]. The limited temporal resolution of a few ns, due to the ns-laser excitation and PMT detection, made disambiguation of different contributions to the lifetime reduction challenging.

This project is aimed at enhancing the temporal resolution of fluorescence measurements by implementing time correlated single photon counting. This technique allows us to cover the sub-ns lifetime region currently not achievable in our cluster doping apparatus. We present the current status of the ongoing upgrade of our setup and discuss advantages and implementation challenges.

[1] M. Bohlen et al. J. Chem. Phys. 156, 034305 (2022).

[2] S. Izadnia et al. J. Phys. Chem. Lett. 8, 2068 (2017).