Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/222724
Title: An Extension of the Stern–Volmer Equation for Thermally Activated Delayed Fluorescence (TADF) Photocatalysts
Author: Limburg, Bart
Keywords: Fluorescència
Fotocatàlisi
Fluorescence
Photocatalysis
Issue Date: 11-Oct-2024
Publisher: American Chemical Society
Abstract: Fluorescence quenching experiments are essential mechanistic tools in photoredox catalysis, allowing one to elucidate the first step in the catalytic cycle that occurs after photon absorption. Thermally activated delayed fluorescence (TADF) photocatalysts, however, yield nonlinear Stern–Volmer plots, thus requiring an adjustment to this widely used method to determine the efficiency of excited state quenching. Here, we derive an extension of the Stern–Volmer equation for TADF fluorophores that considers quenching from both the singlet and triplet excited states and experimentally verify it with fluorescence quenching experiments using the commonly employed TADF-photocatalyst 4CzIPN, and multiple-resonance TADF-photocatalyst QAO with three different quenchers in four solvents. The experimental data are perfectly described by this new equation, which in addition to the Stern–Volmer quenching constants allows for the determination of the product of intersystem and reverse intersystem crossing quantum yields, a quantity that is independent of the quencher.
Note: Reproducció del document publicat a: https://doi.org/10.1021/acs.jpclett.4c02609
It is part of: Journal of Physical Chemistry Letters, 2024
URI: https://hdl.handle.net/2445/222724
Related resource: https://doi.org/10.1021/acs.jpclett.4c02609
ISSN: 1948-7185
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)
Articles publicats en revistes (Institut de Química Teòrica i Computacional (IQTCUB))

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