Spin-Dependent Electron-Hole Capture Kinetics in Luminescent Conjugated Polymers
- 3 February 2003
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 90 (5) , 057402
- https://doi.org/10.1103/physrevlett.90.057402
Abstract
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=tau(T)/tau(S) 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.Keywords
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