Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 9: Nanostructures at Surfaces I
O 9.9: Vortrag
Montag, 7. März 2016, 12:30–12:45, H6
Morphology and Environment dependent Luminescence of Dye Aggregates — •Mohammadreza Bahrami1, Sven Kraft1, Tamam Bohamud1, Kai Wardelmann1, Björn Vogler1, Johannes A.A.W. Elemans2, Ingo Barke1, and Sylvia Speller1 — 1University of Rostock, Institute of Physics, 18059 Rostock, Germany — 2Radboud University Nijmegen, Institute for Molecules and Materials, 6525 AJ Nijmegen, The Netherlands
We study the spatially resolved photoluminescence, as one of the relaxation pathways of excitons, from Copper-based porphyrin [1] aggregates which form on surfaces via self-organization. Among the different observed morphological motifs of the aggregates we focus on isotropic aggregates as well as branched strands with typical heights between 30 and 150 nm. Fluorescence and phosphorescence microscopy images show different intensity from these two morphologies. Utilizing atomic force microscopy we correlate photoluminescence and structural properties to elaborate on possible reasons of such morphology-dependent luminescence. We further present our results on the effect of metallic nanostructures in the vicinity of the aggregates and address the role of these metal systems as local sources of enhanced excitation fields.
[1] M.J.J. Coenen, et al., Phys. Chem. Chem. Phys. 15, 12451 (2013)