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Dynamical exciton decay in organic materials: the role of bimolecular recombination
Univ Brasilia, Brazil.
Univ Brasilia, Brazil.
Univ Brasilia, Brazil.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Univ Brasilia, Brazil.ORCID iD: 0000-0001-7468-2946
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2019 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 21, no 4, p. 1711-1716Article in journal (Refereed) Published
Abstract [en]

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 materials 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.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2019. Vol. 21, no 4, p. 1711-1716
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-155599DOI: 10.1039/c8cp05951aISI: 000459584100004PubMedID: 30620347OAI: oai:DiVA.org:liu-155599DiVA, id: diva2:1297808
Note

Funding Agencies|Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]; Brazilian Research Council CNPq; Brazilian Research Council FAPDF [0193.001.511/2017, 0193.001662/2017]; Brazilian Ministry of Planning, Budget and Management [DIPLA 005/2016]; CNPq [304020/2016-8, 407682/2013-9]; FAP-DF [193.001.596/2017, 193.001.284/2016]; CENAPAD-SP

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-06-27

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Citation style
  • apa
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