Issue 4, 2019

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

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

Article information

Article type
Paper
Submitted
21 Sep 2018
Accepted
09 Dec 2018
First published
11 Dec 2018

Phys. Chem. Chem. Phys., 2019,21, 1711-1716

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements