Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 11: Thin organic films II

DS 11.2: Hauptvortrag

Dienstag, 28. März 2006, 11:30–12:15, GER 38

Fluorescence from ultrathin organic films on crystalline surfaces — •Moritz Sokolowski — Institut für Physikalische und Theoretische Chemie, Universität Bonn, Germany

Ultrathin ordered films of fluorescent organic molecules grown by vapour deposition on crystalline and atomically well-defined surfaces are presently of interest under both applied and fundamental aspects. In particular, they offer a possibility to study basic processes of excitons in molecular materials, e.g., in relation to the film structure, morphology, and thickness. This approach also makes use of the possibility that thin organic films can often be grown in different polymorphic, partly metastable, structures on surfaces, as a consequence of the chemical bonding of the molecules to the substrate surface, and can thus lead to new optical properties. We discuss fluorescence spectra of several examples of films of aromatic molecules, e.g., films of tetracene, grown on metallic and dielectric substrates. This work was supported by the DFG.