We present a detailed and comprehensive picture of the photophysics of thermally activated delayed fluorescence (TADF). The approach relies on a few-state model, parametrized ab initio on a prototypical TADF dye, that explicitly accounts for the nonadiabatic coupling between electrons and vibrational and conformational motion, crucial to properly address (reverse) intersystem crossing rates. The Onsager model is exploited to account for the medium polarity and polarizability, with careful consideration of the different time scales of relevant degrees of freedom. TADF photophysics is then quantitatively addressed in a coherent and exhaustive approach that accurately reproduces the complex temporal evolution of emission spectra in liquid solvents as well as in solid organic matrices. The different rigidity of the two environments is responsible for the appearance in matrices of important inhomogeneous broadening phenomena that are ascribed to the intertwined contribution from (quasi)static conformational and dielectric disorder.

Thermally Activated Delayed Fluorescence: Polarity, Rigidity, and Disorder in Condensed Phases / Phan Huu, Dang Khoa Andrea; Saseendran, Sangeeth; Dhali, Rama; Franca, Larissa Gomes; Stavrou, Kleitos; Monkman, Andrew; Painelli, Anna. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - (2022). [10.1021/jacs.2c05537]

Thermally Activated Delayed Fluorescence: Polarity, Rigidity, and Disorder in Condensed Phases

Phan Huu, Dang Khoa Andrea;Saseendran, Sangeeth;Dhali, Rama;Painelli, Anna
2022-01-01

Abstract

We present a detailed and comprehensive picture of the photophysics of thermally activated delayed fluorescence (TADF). The approach relies on a few-state model, parametrized ab initio on a prototypical TADF dye, that explicitly accounts for the nonadiabatic coupling between electrons and vibrational and conformational motion, crucial to properly address (reverse) intersystem crossing rates. The Onsager model is exploited to account for the medium polarity and polarizability, with careful consideration of the different time scales of relevant degrees of freedom. TADF photophysics is then quantitatively addressed in a coherent and exhaustive approach that accurately reproduces the complex temporal evolution of emission spectra in liquid solvents as well as in solid organic matrices. The different rigidity of the two environments is responsible for the appearance in matrices of important inhomogeneous broadening phenomena that are ascribed to the intertwined contribution from (quasi)static conformational and dielectric disorder.
2022
Thermally Activated Delayed Fluorescence: Polarity, Rigidity, and Disorder in Condensed Phases / Phan Huu, Dang Khoa Andrea; Saseendran, Sangeeth; Dhali, Rama; Franca, Larissa Gomes; Stavrou, Kleitos; Monkman, Andrew; Painelli, Anna. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - (2022). [10.1021/jacs.2c05537]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2927851
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