Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Molecular Electronics and Photonics
CPP 18.4: Vortrag
Dienstag, 8. März 2016, 10:15–10:30, H42
Photon-correlation studies on single 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
Future communication technologies demand for non-classical light sources based on efficient quantum emitters like organic molecules. The chemical variability and tunable fluorescence by proper substituents render Perylene Bisimides (PBIs) interesting candidates for implementation in single photon devices.
We will highlight the excitation dynamics of para-xylylene bridged PBI-macrocycles by means of photon-correlation measurements. These compounds show remarkable optical properties due to fast excitation energy transfer between the PBI entities [1]. We compare macrocycles with three and four chromophores with the PBI reference and show that the absorption cross section can be enhanced and the interaction with the surrounding matrix can be reduced while all macrocycles under study behave as single photon emitters. Utilizing the distribution of inter-photon delay times g(2) we determine the radiative transition rate 0.16(2)ns−1 from the excited S1 to the ground state.
Our study advances the understanding of excitation and relaxation processes in multichromophoric systems and thus, promotes their application as single photon emitters.
[1] F. Schlosser et al., Chem. Sci. 3, 2778 (2012)