Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster: Organic-Inorganic Hybrid Systems and Organic Films

O 42.18: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Morphology and luminescence of tetracene micro- and nanostructures — •Cordelia Horns, Christian Völkner, Mohammadraza Bahrami, Kevin Oldenburg, Regina Lange, Sylvia Speller, and Ingo Barke — University of Rostock, Institute of Physics, 18059 Rostock, Germany

Tetracene is a promising material for long-range exciton transport [1, 2, 3]. We are interested in the transport and coupling of excitons in nanostructured molecule materials. Since fluorescence is one of the possible channels for exciton decay, spatial mapping of fluorescence is a valuable approach for the analysis of excitation pathways. In this work we report on the morphology and luminescence of mesoscopic and nanoscopic tetracene aggregates created by drop-casting on a variety of substrates such as sapphire and glass. We use a correlative approach where the morphology is measured by Atomic Force Microscopy at the same location as fluorescence images within a single microscope, thus avoiding sample transfers. The aggregates exhibit different shapes including morphologies with distinct heights of ∼ 30 nm and ∼ 100 nm, showing different fluorescence intensity and polarization. By analyzing the images possible reasons and mechanisms for the dependence of fluorescence on the local environment are discussed.

[1] SR Yost, E Hontz, S Yeganeh, T Van Voorhis, J. Phys Chem C, 116, 17369 (2012)

[2] GM Akselrod, PB Deotare, NJ Thompson, J Lee, WA Tisdale, MA Baldo, VM Menon, V Bulovic, Nature Comm. 6, 1 (2014)

[3] X Xie, H Ma, ChemistryOpen, 5, 201 * 205 (2016)