SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics III: Light-Matter Interaction and Spectroscopy II
O 76.9: Vortrag
Donnerstag, 30. März 2023, 12:30–12:45, WIL A317
Disentangling the Orientations of Spectrally Overlapping Transition Dipoles in Dense Dye Layers — •Christoph Schnupfhagn1, Thorsten Schumacher1, Paul Markus2, Georg Papastavrou2, Olha Aftenieva3, Tobias A. F. König3, Volodymyr Dudko4, Marian Matejdes4, Josef Breu4, and Markus Lippitz1 — 1Experimental Physics III, University of Bayreuth — 2Physical Chemistry II, University of Bayreuth — 3Leibniz-Institut für Polymerforschung Dresden e.V. — 4Inorganic Chemistry I, University of Bayreuth
The transition dipole orientations of dye assemblies in heterostructures have a crucial impact on the efficiency of novel optoelectronic devices such as organic thin-film transistors and light-emitting diodes. These devices are frequently based on heterojunctions and tandem structures featuring multiple optical transitions. Precise knowledge of preferred orientations, spatial order, and spatial variations is highly relevant. We present a fast and universal large-area screening method to determine the transition dipole orientations in dye assemblies with diffraction-limited spatial resolution. Moreover, our hyperspectral imaging approach disentangles the orientations of different chromophores. As a demonstration, we apply our technique to dye monolayers with two optical transitions sandwiched between two ultrathin silicate nanosheets. A comprehensive model for dipole orientation distributions in monolayers reveals a long-range orientational order and a strong correlation between the two transitions.