Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Molecular Nanostructures and Solids

MO 11.6: Talk

Wednesday, March 8, 2017, 15:45–16:00, N 25

Optical Spectroscopy on Single Dye Crystals — •Chris Rehhagen, Steffen Wolter, and Stefan Lochbrunner — Universität Rostock, Institut für Physik, 18051 Rostock

Optical properties of dye crystals are of rising interest in applications, especially due to potentially large exciton mobilities. Furthermore, crystals provide stable and regular structures which are well suited for common characterization methods. Small crystals in the range of 10-500 µm are prepared from solutions of the dyes TTBC (1,1’,3,3’-tetraethyl-5,5’,6,6’-tetrachlorobenzimidazolocarbocyanine) and Coumarin 153. To investigate their optical properties we implement a microscope with a resolution of 40 µm for single-crystal absorption and fluorescence spectroscopy. The setup is combined with a streak-camera and can also be inserted in a femtosecond pump-probe experiment. First results indicate, that there is a connection between the macroscopic structure of the crystals and their optical properties. Especially some TTBC crystals show fluorescence spectra with components typical for J-type aggregation. The resulting increase in spectral overlap of absorption and fluorescence implies enhanced exciton migration according to Förster theory.