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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.44: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
Impact of Mixing on Coupling of Tranisition Dipole Moments in Pentacene: Dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene — •Arne Morlok1, Clemens Zeiser1, Daniel Lepple1, Guillaume Schweicher2, Yves Geert3, and Katharina Broch1 — 1Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 2University of Cambridge, Cavendish Laboratory, JJ Thompson Avenue 19, CB3 0HE Cambridge, UK — 3Universite Libre de Bruxelles, Chemistry Departement, Avenue Franklin Roosevelt 50, 1050 Bruxelles, Belgium
The coupling of transition dipole moments (TDMs) strongly affects the optical properties of organic semiconductors (OSCs), for instance in H- or J-type coupling or Davydov-splitting [1].Despite changes in the unit cell parameters, in blends of pentacene (PEN) with the H-aggregate diindenoperylene (DIP) no significant changes in the H-type coupling have been observed, which is consistent with the orientation of the TDMs [2]. For J-aggregates however, the impact of mixing and the corresponding increase in intermolecular distances will be more pronounced but has so far not been discussed in detail in the literature.
Here, we report the optical properties of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene, which shows the optical properties of a J-aggregate, in blends with PEN. We observe strong changes in the intensity of absorption peaks, which can be directly related to the increase in the lattice spacing and the reduced coupling of TDMs.
[1] F. C. Spano, Acc. Chem. Res. 43 (2010)
[2] K. Broch et al., J. Phys. Chem. C 117 (2013)