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Issue 4, 2019
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Dynamical exciton decay in organic materials: the role of bimolecular recombination

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Abstract

Excitons play a critical role in light emission when it comes to organic semiconductors. In high exciton concentration regimes, monomolecular and bimolecular routes for exciton recombination can yield different products affecting significantly the material's optical properties. Here, the dynamical decay of excitons is theoretically investigated using a kinetic Monte Carlo approach that addresses singlet exciton diffusion. Our numerical protocol includes two distinct exciton–exciton interaction channels: exciton annihilation and biexciton cascade emission. Our findings reveal that these channels produce different consequences concerning diffusion and spectroscopic properties, being able to explain diverging experimental observations. Importantly, we estimate critical exciton densities for which bimolecular recombination becomes dominant and investigate its effect on average exciton lifetimes and diffusion lengths.

Graphical abstract: Dynamical exciton decay in organic materials: the role of bimolecular recombination

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Publication details

The article was received on 21 Sep 2018, accepted on 09 Dec 2018 and first published on 11 Dec 2018


Article type: Paper
DOI: 10.1039/C8CP05951A
Citation: Phys. Chem. Chem. Phys., 2019,21, 1711-1716

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    Dynamical exciton decay in organic materials: the role of bimolecular recombination

    L. E. de Sousa, F. T. Bueno, D. A. da Silva Filho, L. A. Ribeiro Junior and P. H. de Oliveira Neto, Phys. Chem. Chem. Phys., 2019, 21, 1711
    DOI: 10.1039/C8CP05951A

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