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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.6: Poster
Montag, 27. März 2023, 18:00–20:00, P3
Temperature Dependent Photoluminescence of β-Phase Zinc Phthalocyanine Single Crystals — •Kilian Strauß1, Lisa Schraut-May1, Sebastian Hammer1,2, Kilian Frank3, Bert Nickel3, and Jens Pflaum1 — 1Experimental Physics VI, Julius-Maximilians-Universität of Würzburg — 2Department of Physics, Ludwig Maximilian University, Munich — 3Departments of Physics and Chemistry, McGill University, Montreal, Canada
The photophysical properties of organic crystals are strongly dependent on the interactions between the comprising molecules.
We chose zinc phthalocyanine (ZnPc) in its crystallographic β-phase as a model system to investigate the excitonic coupling as a function of crystallographic direction. For this purpose, we performed polarization dependent photoluminescence (PL) measurements from 5 K to 300 K on needle-shaped single crystals grown by horizontal vapour deposition.
A gradual optical transition from a J- to H-aggregate like behavior occurs on cooling down to 100 K.
Upon further cooling, we find the emergence of superradiant luminescence typical for exciton delocalization in J-aggreagtes.
This optical transition is induced by an anisotropic thermal compression of the crystal lattice.
We thank the Bavarian Research Network SolTech for financial support.