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PGI Kolloquium:

Prof. Dr. Moritz Sokolowski,
University of Bonn, Germany
 

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

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02.06.2017 11:00 Uhr

Fluorescence Spectroscopy of Large Organic Molecules on Surfaces

SokolowskiCopyright: Prof. Dr. Sokolowski

Adsorption of large π-conjugated organic molecules on well-defined surfaces has become a topic of growing interest during last years under both fundamental and applied aspects, e.g., optoelectronic applications of molecular films. Although fluorescence (FL) spectroscopy of π-conjugated organic molecules is well-established for thin molecular films, for isolated or aggregated molecules on surfaces with coverages in the monolayer regime, this technique is not very common so far.

However, as we demonstrate, there are at least two interesting aspects concerning the combination of surface science experiments with fluorescence spectroscopy. The first is related to the high signal-to-noise ratio and the very high spectral resolution of FL spectroscopy which allows performing experiments for ultimate low concentrations of molecules on surfaces down to the 10-5 monolayer range.

The second aspect concerns the self-organization of molecules on surfaces. This enables one to prepare well-defined two-dimensional ordered molecular aggregates for which the intermolecular resonance interaction leads to interesting optical phenomena.

Kontakt

Prof. Dr. Christian Kumpf
Telefon: +49 2461 61-1452
Fax: +49 2461 61-3907
E-Mail: c.kumpf@fz-juelich.de

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