Issue 3, 2022

Modelling quenching mechanisms of disordered molecular systems in the presence of molecular aggregates

Abstract

Exciton density dynamics recorded in time-resolved spectroscopic measurements is a useful tool to recover information on energy transfer (ET) processes that can occur at different timescales, up to the ultrafast regime. Macroscopic models of exciton density decays, involving both direct Förster-like ET and diffusion mechanisms for exciton–exciton annihilation, are largely used to fit time-resolved experimental data but generally neglect contributions from molecular aggregates that can work as quenching species. In this work, we introduce a macroscopic model that includes contributions from molecular aggregate quenchers in a disordered molecular system. As an exemplifying case, we considered a homogenous distribution of rhodamine B dyes embedded in organic nanoparticles to set the initial parameters of the proposed model. The influence of such model parameters is systematically analysed, showing that the presence of molecular aggregate quenchers can be monitored by evaluating the exciton density long time decays. We showed that the proposed model can be applied to molecular systems with ultrafast decays, and we anticipated that it could be used in future studies for global fitting of experimental data with potential support from first-principles simulations.

Graphical abstract: Modelling quenching mechanisms of disordered molecular systems in the presence of molecular aggregates

Supplementary files

Article information

Article type
Paper
Submitted
17 Sep 2021
Accepted
11 Dec 2021
First published
13 Dec 2021

Phys. Chem. Chem. Phys., 2022,24, 1787-1794

Modelling quenching mechanisms of disordered molecular systems in the presence of molecular aggregates

G. Fanciullo, I. Conti, P. Didier, A. Klymchenko, J. Léonard, M. Garavelli and I. Rivalta, Phys. Chem. Chem. Phys., 2022, 24, 1787 DOI: 10.1039/D1CP04260B

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