Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets
MO 27.27: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Spectroscopy of Single Perylene Bisimide Trimers: How to Identify the Number of Emissive States? — •Abey Issac1, Richard Hildner1, Sebastian Beyer1, Mario Schörner1, Catharina Hippius2, Frank Würthner2, and Jürgen Köhler1 — 1Experimentalphysik IV und BIMF, Universität Bayreuth, 95440 Bayreuth, Germany — 2Universität Würzburg, Institut für Organische Chemie and Center for Nanosystems Chemistry, Am Hubland, 97074 Würzburg, Germany
We investigate the fluorescence of single trimer molecules which consists of three perylene bisimides (PBIs) linked by two calix[4]arene units, embedded in a polymer matrix. The electronic excitations in such systems are localized on the PBI subunits. Hence the emission time traces of single trimers are expected to show three distinct intensity levels which correspond to an intact trimer and successive photobleaching of individual PBIs. However, we observed 2-5 intensity levels, which indicate that additional intra-molecular interactions take place [1]. In order to identify these processes, we recorded polarization resolved spectra of individual trimers and monitored the relative changes in the intensity and peak emission wavelength as a function of time in two orthogonal polarizations. Furthermore, we performed time resolved measurements which allow for the analysis of the intensity trajectory photon by photon using the change point algorithm. From the correlations between these observables we identify the number of intensity levels and obtain information about the blinking behavior of PBI trimers. [1] Issac et al. PCCP 2012, 14, 10789