title: Concentration effects on intrachain polaron recombination in conjugated polymers.
abstract: The influence of different charge carrier concentrations on the recombination dynamics between oppositely charged polarons is numerically investigated using a modified version of the Su-Schrieffer-Heeger (SSH) model that includes an external electric field and electron-electron interactions. Our findings show that the external electric field can play the role of avoiding the formation of excited states (polaron-exciton and neutral excitation) leading the system to a dimerized lattice. Interestingly, depending on a suitable balance between the polaron concentration and the electric field strength, the recombination mechanism can form stable polaron-excitons or neutral excitations. These results may provide guidance to improve the electroluminescence efficiency in Polymer Light Emitting Diodes.
authors.affiliation: Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden. luiju@ifm.liu.se.
authors.forename: Luiz Antonio Ribeiro
authors.initials: LA
authors.lastname: Junior
authors.forename: Wiliam Ferreira
authors.initials: WF
authors.lastname: da Cunha
authors.forename: Antonio Luciano
authors.initials: AL
authors.lastname: de Almeida Fonseca
authors.forename: Ricardo
authors.initials: R
authors.lastname: Gargano
authors.forename: Geraldo Magela
authors.initials: GM
authors.lastname: e Silva