Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Poster III

CPP 28.15: Poster

Mittwoch, 20. März 2024, 11:30–13:30, Poster C

Versatile Setup for Gas Phase Spectroscopy of Organic Molecules — •Sebastian Kaiser, Sebastian Schellhammer, and Sebastian Reineke — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden

In order to gain a better insight into the optical properties and the associated electronic structure of organic semiconductors, it is reasonable to complement the often application-oriented investigations on thin films and solutions with further measurements. Spectroscopy of molecules in the gas phase could resolve vibronic substructures and attenuate ambient effects such as polarization also providing ideal reference data for material simulations. In this contribution, we present a new experimental setup for the spectroscopy of organic semiconductors in gas phase that aims at combining simplicity with efficiency and versatile applicability. The setup is evaluated by using Alq3, MADN, NPB, and TBPe. Sealed under vacuum in a glass ampoule, the materials are heated above the vaporization temperature using hot air. The transparent ampoule allows excitation and detection of emission from the molecules in gas phase with relative ease. However, we also find a strong temperature dependence of the emission spectra resulting from material decomposition, especially for NPB. This is accompanied by a visible discoloration of the cooled material after the measurement. As a first approach, the designed experimental setup is promising. Still, to resolve excitonic substructures, further improvements are required, especially concerning temperature control.

Keywords: Organic molecules; Emission; Spectroscopy; Organic semiconductors