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- W2334183918 abstract "Field-induced fluorescence quenching of poly(p-phenylene vinylene) (PPV) oligomers due to nonradiative relaxation through free electron–hole pair (FEHP) states is modeled using singles configuration interaction computations with the intermediate neglect of differential overlap Hamiltonian. The computations find FEHP states with energies that drop linearly with applied field and undergo avoided crossings with the fluorescent state. The coupling between the FEHP and fluorescent state, computed for multiple FEHP states on a variety of oligomer lengths, is found to depend primarily on the field strength required for the state to cross the fluorescent state. The rate of decay to these dark FEHP states is then calculated from Marcus theory, which is modified to take into account dielectric in addition to other bulk measurement considerations. The results predict that individual molecules go from being emissive to fully quenched over a small range of applied field strengths. Phenomenological introduction of inhomogeneous broadening for the energies of the FEHP states leads to a more gradual dependence on applied field. The fluorescence quenching mechanism considered here is found to be important for applied fields above about 1 MV cm–1, which is similar in magnitude to those present in light-emitting diodes." @default.
- W2334183918 created "2016-06-24" @default.
- W2334183918 creator A5038085437 @default.
- W2334183918 creator A5083694028 @default.
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- W2334183918 date "2015-04-06" @default.
- W2334183918 modified "2023-10-13" @default.
- W2334183918 title "Modeling Field-Induced Quenching in Poly(p-phenylene vinylene) Polymers and Oligomers" @default.
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- W2334183918 doi "https://doi.org/10.1021/jp511544c" @default.
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