Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: POSTERS Single Molecules, Biopolymers, Membranes

CPP 9.1: Poster

Monday, February 25, 2008, 16:45–19:00, Poster A

Quantification of singlet-singlet annihilation in an acceptor-donor-acceptor compound at the single molecule level — •Burkhard Fückel¹, Gerald Hinze¹, Florian Diehl¹, Fabian Nolde², Klaus Müllen², and Thomas Basché¹ — ¹Institut für Physikalische Chemie, Johannes Gutenberg-Universität, Jakob-Welder-Weg 11, 55099 Mainz, Germany — ²Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany

We have investigated a new multichromophoric compound consisting of a central perylendiimide donor (D) chromophore and two terrylendiimide acceptor (A) chromophores adjacent to it (A-D-A). After electronic excitation of the donor chromophore, energy is rapidly transferred to the acceptor chromophores. Time-resolved measurements by means of optical single molecule spectroscopy revealed that singlet-singlet annihilation (SSA) takes place upon excitation of both acceptor chromophores.

We quantitatively determined the rate of the SSA process at the single molecule level. Our approach combines the detection of photon arrival time coincidences with Monte Carlo simulations. On average the SSA rate is found to be two to three times faster than the fluorescence lifetime of terrylendiimide.