Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 43: Nano-Optics (Single Quantum Emitters)
Q 43.8: Vortrag
Mittwoch, 7. März 2018, 16:00–16:15, K 0.023
Exciton-exciton dynamics in para-xylylene bridged perylene bisimide macrocycles — •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
Multi-chromophoric systems serve as strong links between free photons and excitonic excitations in nature and define promising compounds for non-classical light sources in quantum optics. In this context, we have identified Perylene Bisimides (PBIs) as a model system for strong absorption and efficient single photon emission at room temperature promoted by their chemical tunability and high photostability [1]. We compare para-xylylene bridged PBI-macrocycles to single chromophores by means of fluorescence correlation measurements. PBI-macrocycles act as bright single photon emitters since ultra-fast exciton-exciton-annihilation significantly suppresses the simultaneous emission of two photons. However, approaching single-excited state saturation by increasing the excitation intensity the co-existence of multi-excitonic states becomes more likely and controls the emission characteristics of the macrocycles while the emission of single chromophores remains largely unchanged. We consistently explain our observations by a stochastic Markov model and advance the understanding of excitation and relaxation processes in multi-chromophoric systems.
[1] F. Schlosser et al., Chem. Sci. 3, 2778 (2012)