Abstract：
:Organic nanofibers have found various applications in optoelectronic devices. In such devices, exciton diffusion is a major aspect concerning their efficiency. In the case of singlet excitons, Förster transfer is the mechanism responsible for this process. Temperature and morphology are factors known to influence exciton diffusion but are not explicitly considered in the expressions for the Förster rate. In this work, we employ a Kinetic Monte Carlo (KMC) model to investigate singlet exciton diffusion in para-hexaphenyl (P6P) and α-sexithiophene (6T) nanofibers. Building from previous experimental and theoretical studies that managed to obtain temperature dependent values for Förster radii, exciton average lifetimes and intermolecular distances, our model is able to indicate how these parameters translate into diffusion coefficients and diffusion lengths. Our results indicate that these features strongly depend on the coordination number in the material. Furthermore, we show how all these features influence the emitted light color in systems composed of alternating layers of P6P and 6T. Finally, we present evidence that the distribution of exciton displacements may result in overestimation of diffusion lengths in experimental setups.
journal_name
Sci Repjournal_title
Scientific reportsauthors
de Sousa LE,da Silva Filho DA,de Sousa RT Jr,de Oliveira Neto PHdoi
10.1038/s41598-018-32232-5subject
Has Abstractpub_date
2018-09-19 00:00:00pages
14066issue
1issn
2045-2322pii
10.1038/s41598-018-32232-5journal_volume
8pub_type
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