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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Molecular Electronics and Excited State Properties (joint session CPP/TT)

CPP 28.4: Vortrag

Mittwoch, 29. März 2023, 10:15–10:30, GÖR 226

A Tool Kit for Analyzing Emission Spectra of Multi-Molecular States — •Sebastian Hammer^1,4, Theresa Linderl², Kristofer Tvingstedt¹, Wolfgang Bruetting², and Jens Pflaum^1,3 — ¹Experimental Physics VI, University of Würzburg, 97074 Würzburg — ²Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — ³Bayerisches Zentrum für Angewandte Energieforschung (ZAE Bayern), 97074 Würzburg — ⁴Departments for Physics and Chemistry, McGill University, Montreal, Canada

The performance of opto-electronic devices is often crucially impacted by multi-molecular excited states such as charge-transfer (CT) states or excimers. Hence, the spectroscopic analysis of these states is a common tool in the characterization of such systems. Due to the many parameters at play full quantum mechanical interpretations are tedious and therefore the analysis is often performed on a phenomenological level only. Here we present a tool kit to analyze temperature dependent emission spectra using a Franck-Condon based approach with a single effective inter-molecular vibrational mode and discuss the implications of considering different potentials for the ground and excited state harmonic oscillators [1]. Finally, we show that fundamental parameters of the potential energy landscape can be extracted from temperature dependent steady state emission spectra using the example of a tetraphenyldibenzoperiflanthene:C₆₀ CT hetero-structure [2]. Funding from the DFG (Project 490894053) is greatfully acknowledged.

[1] Hammer et al., Mater. Horiz.. (2022). doi: 10.1039/D2MH00829G

[2] Linderl et al., Phys. Rev. Appl.. 13 024061 (2020)