Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics
MO 14.6: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.IV
Spectroscopy of Single Perylene Bisimide Trimers: How Bright States Report About Dark States — •Abey Issac1, Richard Hildner1, Catharina Hippius2, Frank Würthner2, and Jürgen Köhler1 — 1Experimental Physics IV and Elite Network of Bavaria (ENB), University of Bayreuth, 95447 Bayreuth, Germany — 2Institut für Organische Chemie and Röntgen Research Center for Complex Material Systems, Universität Würzburg, 97074 Würzburg, Germany
We investigate the fluorescence of single perylene bisimide(PBI)triads linked by two calix[4]arene units, embedded in a polymer matrix. Emission time traces of single triads recorded at room temperature show discrete signal levels which probably reflect the radicalization of individual monomer units. This suggests that the electronic excitations are mainly localized on a monomer unit (weak coupling regime). Emission from such localized states carries information about the neighboring charged (dark) PBI units. In order to extract this information, we recorded along with the fluorescence intensity as a function of time both the fluorescence lifetime and the emission spectrum. Correlations between these observables allow us to characterize the nature of the dark (radical) state.