Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Nano-Optics I
Q 12.4: Vortrag
Montag, 6. März 2017, 17:45–18:00, P 11
Studies on single perylene bisimide macrocyclesat strong photo-excitation — •Ulrich Müller1, Peter Spenst2, Matthias Stolte2, Frank Würthner2, and Jens Pflaum1,3 — 1Experimentelle Physik VI, Julius-Maximilians-Universität, Würzburg — 2Institut für Organische Chemie, Julius-Maximilians-Universität, Würzburg — 3ZAE Bayern, Würzburg
Quantum emitters like individual organic guest molecules within a matrix can serve as non-classical light sources in quantum communication and metrology applications. In this context, single Perylene Bisimides (PBIs) are interesting candidates for single photon emitters due to their chemically tunability, strong fluorescence and high photostability [1].
Using a confocal-microscopy set-up in combination with fluorescence correlation measurements we characterize the optical properties of PBIs as single quantum emitters at various excitation powers. We will highlight the rich excitation dynamics of para-xylylene bridged PBI-macrocycles and compare them to single chromophores:
At low excitation densities PBI-macrocycles act as bright and stable single photon emitters due to a fast energy transfer between the different chromophores of the macrocycle. Above intensity saturated excitation the co-existence of multi-excitonic states on the macrocycle becomes more likely and the process of exciton-exciton-annihilation controls the emission characteristics. We provide a model to consistently explain our observations and to advance the understanding of excitation and relaxation processes in multi-chromophoric systems.
[1] F. Schlosser et al., Chem. Sci. 3, 2778 (2012)