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K: Fachverband Kurzzeitphysik
K 4: Poster
K 4.2: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Excited State Dynamics and Conformations of a Cu(II)-Phthalocyanine-Perylenebisimide Dyad — •Kevin Wilma1, Thomas Unger2, Manuel Hollfelder3, Christoph Hunger4, Sinem Tuncel4,5, Anna Köhler2, Mukundan Thelakkat4, Stephan Gekle3, Jürgen Köhler1, and Richard Hildner1 — 1Experimentalphysics IV, University of Bayreuth — 2Experimentalphysics II, University of Bayreuth — 3Physics Department, University of Bayreuth — 4Applied Functional Polymers, University of Bayreuth — 5Technical University of Gebze, Turkey
We investigate a new molecular donor-bridge-acceptor system, a Cu(II)-phthalocyanine (CuPc) covalently linked via a long, flexible spacer group to a perylenebisimide (PBI), for its potential use in solar cell applications. In order to get insights into the excited state dynamics and the conformation of this dyad, we performed time-resolved polarization anisotropy and pump-probe measurements in combination with molecular dynamics simulations. The data suggest the existence of two conformations of the dyad: an extended conformation and a highly stable folded structure, in which PBI and CuPc are stacked on top of each other. The extended dyad shows emission from both PBI and CuPc. In contrast, for the folded conformation the emission of the dyad is strongly quenched, due to energy transfer from the PBI to CuPc (3 ps) and subsequent intersystem-crossing (300 fs) from the first excited singlet state of CuPc into the triplet state. Finally (non-)radiative deactivation of the triplet state takes place within 25 ns.