Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 18: Organic Thin Films I

DS 18.1: Talk

Wednesday, April 2, 2014, 09:30–09:45, CHE 91

Structural and photophysical properties of a two dimensional J-aggregate: MePTCDI on KCl — •Christian Marquardt, Alexander Paulheim, and Moritz Sokolowski — Institute for Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, 53115 Bonn, Germany

The structural and photophysical properties of the organic dye molecule MePTCDI (N,N-dimethylperylene-3,4,9,10-bis(dicarbox-imide)) adsorbed on KCl(100) surfaces have been investigated by low energy electron diffraction (LEED), fluorescence (FL) and FL excitation spectroscopy (FLE). Similar to the model molecule PTCDA the monolayer of MePTCDI forms a commensurate c(4 × 4) brickwall structure on KCl. In this structure, the transition-dipole moments of the molecules are arranged in a head to tail conformation forming two-dimensional J aggregates. This results in a superradiant electronic transition in optical emission- and absorption-spectra with a pronounced 0-0-transition and a red shift with respect to the spectra of isolated molecules. We will present the results on MePTCDI and compare them to those of PTCDA on KCl [1].

M. Müller et al., J. Chem. Phys. 139 044302 (2013).