Rapid calculation of internal conversion and intersystem crossing rate for organic materials discovery



Shi, Lei ORCID: 0000-0002-5359-7862, Xie, Xiaoyu and Troisi, Alessandro ORCID: 0000-0002-5447-5648
(2022) Rapid calculation of internal conversion and intersystem crossing rate for organic materials discovery. JOURNAL OF CHEMICAL PHYSICS, 157 (13). 134106-.

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Abstract

The internal conversion (IC) process from S<sub>1</sub> to S<sub>0</sub> and the intersystem crossing (ISC) transition from T<sub>1</sub> to S<sub>0</sub> are two essential processes in functional molecular material design. Despite their importance, it is currently impossible to evaluate the rate of these processes for a large set of molecules and, therefore, perform high-throughput virtual screening in large-scale data to gain more physical insight. In this work, we explore possible approaches to accelerate the calculations of IC and ISC rates based on a systematic reduction of the number of modes included in the computation and the study of the importance of the different parameters and the influence of their accuracy on the final result. The results reproduce the experimental trends with systematic errors that are ultimately due to the approximations of the theory. We noted that plausible results for ISC in planar molecules are only obtained by including the effect of Hertzberg-Teller coupling. Our method establishes the feasibility and expected accuracy of the computation of nonradiative rates in the virtual screening of molecular materials.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 22 Feb 2023 16:08
Last Modified: 21 Aug 2023 02:41
DOI: 10.1063/5.0102857
Open Access URL: https://doi.org/10.1063/5.0102857
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3168565