Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations
CPP 50.31: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Fluorescence Lifetime Imaging Microscopy on Different Samples of the Conjugated Polymer P3HT — •Viktor Messerer1, Lothar Kador1, Richard Hildner2, Hannes Welz3, and Hans-Werner Schmidt3 — 1University of Bayreuth, Institute of Physics and BIMF, 95440 Bayreuth, Germany — 2University of Bayreuth, Experimental Physics IV, 95440 Bayreuth, Germany — 3University of Bayreuth, Macromolecular Chemistry I, 95440 Bayreuth, Germany
A custom-built fluorescence lifetime imaging microscope operating in the frequency domain (FD-FLIM) was used for mapping the fluorescence lifetimes of different samples of the conjugated polymer poly(3-hexylthiophene) (P3HT). Excitation was performed with a diode laser (λ = 488 nm) amplitude-modulated at frequencies between 104 and 160 MHz. Thin films of P3HT which contain a small amount of a tailored supramolecular nucleating agent to allow for the formation of highly ordered P3HT nanofibers were investigated. Neat P3HT was used as a reference. The fluorescence lifetime is obtained from the modulation amplitude of the fluorescence and its phase shift with respect to the excitation. The measured lifetimes are distinctly below 100 ps with the longest values found in the vicinity of the nucleating fibers. This result is ascribed to improved order of the H-aggregated P3HT nanofibers.