SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 9: Poster 2
MO 9.9: Poster
Freitag, 24. September 2021, 17:30–19:30, P
Ultrafast Spectroscopy of Perylene Derivative Nanoparticles — •Chris Rehhagen1, Shahnawaz Rafiq2, Kyra N. Schwarz3, Stefan Lochbrunner1, and Gregory D. Scholes2 — 1Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany — 2Frick Laboratory, Princeton University, 08540 Princeton, USA — 3School of Chemistry, University of Melbourne, Parkville, VIC, 3010 Australia
Organic nanostructures are of increasing interest in opto-electronic applications due to their potentially large exciton mobilities. While as inorganic nanoparticles are already applied in many scenarios, the properties of organic nanostructures are yet to be explored. Among a breadth of organic systems available, Perylene derivatives attract much interest as they provide a high oscillator strength, photostability, and a tuneability of the transition energy and supramolecular structure. We use flash precipitation to prepare nanoparticles of the dye Perylene Red and correlate their optical spectra, quantum yields and emission lifetimes. Ultrafast pump-probe spectroscopy is then performed on samples of different classes to characterize their excited state dynamics. An intermediate charge-transfer state, formed after photoexcitation, was observed. Remarkably, no such intermediate state was observed in the monomer of Perylene Red. We further characterize the exciton diffusion in the nanoparticles by analyzing signatures in the transient dynamics resulting from exciton-exciton annihilation. The resulting diffusion constant is 0.2 nm2/ps resulting in a diffusion length of 10 nm within the singlet exciton lifetime of 90 ps.