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Phys. Rev. Lett. 90, 057402 (2003) [4 pages]

Spin-Dependent Electron-Hole Capture Kinetics in Luminescent Conjugated Polymers

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Stoyan Karabunarliev * and Eric R. Bittner †
Department of Chemistry and Center for Materials Chemistry, University of Houston, Houston, Texas 77204-5003

 See Also: Publisher's Note

Received 22 April 2002; published 3 February 2003; publisher error corrected 10 February 2003

The recombination of electron-hole pairs injected in extended conjugated systems is modeled as a multistep interconversion relaxation in monoexcited electronic state space, mediated by electron-phonon coupling. The computed ratio of triplet-to-singlet exciton formation times r=τT/τS increases from 0.9 for a model dimer to 2.5 for a 32-unit chain, in good agreement with recent experiments. We rationalize the conjugation-length dependence of r in terms of spin-specific energetics and mutual vibronic coupling of the excited states.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.90.057402
DOI: 10.1103/PhysRevLett.90.057402
PACS: 78.60.Fi, 33.50.Dq, 36.20.–r, 82.20.–w

* Email address: karabunarliev@uh.edu
† Email address: bittner@uh.edu

See Also

Publisher's Note: Stoyan Karabunarliev and Eric R. Bittner, Publisher’s Note: Spin-Dependent Electron-Hole Capture Kinetics in Luminescent Conjugated Polymers [Phys. Rev. Lett. 90, 057402 (2003)], Phys. Rev. Lett. 90, 079901 (2003)

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