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MO: Fachverband Molekülphysik

MO 20: Electronic Spectroscopy 2

MO 20.6: Vortrag

Donnerstag, 20. März 2014, 17:45–18:00, BEBEL SR144

Triplet-triplet exciton dynamics in single-wall carbon nanotubes — •Florian Späth¹, Dominik Stich¹, Hannes Kraus², Andreas Sperlich², Vladimir Dyakonov^2,3, and Tobias Hertel¹ — ¹Institute of Physical and Theoretical Chemistry, Julius-Maximilian University Würzburg, Germany — ²Institute of Physics, Julius-Maximilian University Würzburg, Germany — ³Bavarian Center for Applied Energy Research e.V., Würzburg, Germany

Understanding triplet excitons dynamics is crucial for the optimization of optoelectronic devices, since triplet excitons can either increase the efficiency of devices such as OLEDs and organic solar cells or can act as a loss channel. For the first time, triplet-triplet exciton interactions in (6,5)-single-wall carbon nanotubes (SWNTs) were studied by optically detected magnetic resonance (ODMR) spectroscopy[1]. By using a master equation ansatz and taking into account the excitation intensity and frequency dependence of the ODMR signal, we were able to determine the quantum yield of triplet exciton formation of (5 ± 2)% and the triplet exciton lifetime of (30 ± 10) µ s.

[1] D. Stich, F. Späth, H. Kraus, A. Sperlich, V. Dyakonov and T. Hertel, Nature Photonics, in press (doi: 10.1038/nphoton.2013.316)