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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 26
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Phys. Rev. Lett. 91, 267403 (2003) [4 pages]

Linewidth-Limited Energy Transfer in Single Conjugated Polymer Molecules

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J. G. Müller1,*, U. Lemmer2, G. Raschke1, M. Anni1,†, U. Scherf3, J. M. Lupton1,‡, and J. Feldmann1
1Photonics and Optoelectronics Group, Physics Department and CeNS, University of Munich, 80799 Munich, Germany
2Lichttechnisches Institut, Universität Karlsruhe, Kaiserstrasse 12, 76128 Karlsruhe, Germany
3Fachbereich Chemie, Universität Wuppertal, Gauss-Strasse 20, 42097 Wuppertal, Germany

Received 17 June 2003; published 30 December 2003

Using low temperature single molecule spectroscopy on rigid-rod conjugated polymers we are able to identify homogeneously broadened, strongly polarized emission from individual chromophore units on a single chain. Gated fluorescence spectroscopy allows real time imaging of intramolecular energy transfer as the chain behaves as a series of weakly interacting chromophores. Energy transfer is controlled by the chromophoric spectral linewidth, which depends on temperature. Linewidths exceeding intramolecular disorder lead to incoherent chromophore coupling and collective fluorescence phenomena.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.267403
DOI:
10.1103/PhysRevLett.91.267403
PACS:
78.55.Kz, 78.60.Fi, 78.66.Qn, 85.60.Jb

*Current address: Department of Chemistry, University of Florida, Gainesville, FL, USA.

†Permanent address: National Nanotechnology Laboratory of INFM, Innovation Engineering Department, University of Lecce, Via per Arnesano, 73100 Lecce, Italy.

‡Corresponding author.

Email address: john.lupton@physik.uni-muenchen.de

 
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