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MO: Fachverband Molekülphysik

MO 21: Advanced Time-Resolved Spectroscopy

MO 21.4: Vortrag

Donnerstag, 8. März 2018, 14:45–15:00, PA 2.150

Optical Properties of Single Mikrometer Dye Crystals — •Chris Rehhagen, Steffen Wolter, and Stefan Lochbrunner — University of Rostock, Germany

Dye crystals are of rising interest in opto-electronic applications, especially due to potentially large exciton mobilities. Furthermore, crystals provide stable and regular structures which are well suited for common characterization methods. In this work, small crystals in the range of 10−500 µ m are prepared from solutions of the dyes TTBC , Coumarin153 and Perylen Orange. To investigate their optical properties a microscope with a resolution of 30 µ m is implemented for single-crystal absorption and fluorescence spectroscopy. The setup is also combined with a streak camera in order to investigate the dynamics of electronic excitations. Beyond this, FLIM is used to investigate the lifetime distribution down to a spatial resolution of 200 nm. The results show that there is a connection between the macroscopic structure of the crystals and their optical properties. Especially some TTBC crystals show fluorescence spectra with spectrally narrow components typical for J-type aggregation and a lifetime in the range of tens of picoseconds.