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1 November 1997 Photoinduced electron transfer in conjugated polymer/fullerene heterostructures
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We investigate the photophysics in composite systems consisting of fullerene molecules and a conjugated polymer. Photoluminescence (PL) quenching experiments are used to study the photoinduced electron transfer that occurs after photoexcitation of the conjugated polymer In blend systems with various fullerene concentrations we find a strong concentration dependant PL-quenching. By doping a ladder type poly(p-phenylene) (LPPP) with 5 weight percent of a C60-fullerene the polymer PL is quenched by more than one order of magnitude. Time-resolved measurements show that the photoinduced electron transfer can not be described by a single rate. The nonexponential PL-decay is due to complex processes in more detail we have prepared will define heterostructures comprising a self-assembled fullerene monolayer and a thin spin-coated polymer layer. From PL- quenching experiments on these samples we infer a value of 14 nm for the diffusion length of neutral excitations in LPPP.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andreas Haugeneder, C. Kallinger, Wolfgang Spirkl, Uli Lemmer, Jochen Feldmann, Ullrich Scherf, E. Harth, Andreas Guegel, and Klaus Muellen "Photoinduced electron transfer in conjugated polymer/fullerene heterostructures", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997);

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