Using the Mechanical Bond to Tune the Performance of a Thermally Activated Delayed Fluorescence Emitter**
| Autor: | Ifor D. W. Samuel, Federica Rizzi, Eli Zysman-Colman, Stephen M. Goldup, Abhishek Gupta, Beth Laidlaw, Pachaiyappan Rajamalli, Michael A. Jinks, Wenbo Li, Thomas J. Penfold |
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| Přispěvatelé: | European Commission, The Leverhulme Trust, EPSRC, University of St Andrews. School of Physics and Astronomy, University of St Andrews. Centre for Biophotonics, University of St Andrews. Condensed Matter Physics, University of St Andrews. EaSTCHEM, University of St Andrews. School of Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
TADF
Photoluminescence Rotaxane Materials science Luminescence Mechanical bond Quantum yield 010402 general chemistry 01 natural sciences Catalysis supramolecular chemistry chemistry.chemical_compound luminescence rotaxane QD Singlet state Research Articles QC Common emitter MCC mechanical bond 010405 organic chemistry DAS General Chemistry General Medicine QD Chemistry 0104 chemical sciences QC Physics chemistry Chemical physics Covalent bond Luminophore Supramolecular Chemistry | Hot Paper Supramolecular chemistry Research Article |
| Zdroj: | Angewandte Chemie (International Ed. in English) |
| ISSN: | 0044-8249 1433-7851 |
| Popis: | We report the characterization of rotaxanes based on a carbazole‐benzophenone thermally activated delayed fluorescence luminophore. We find that the mechanical bond leads to an improvement in key photophysical properties of the emitter, notably an increase in photoluminescence quantum yield and a decrease in the energy difference between singlet and triplet states, as well as fine tuning of the emission wavelength, a feat that is difficult to achieve when using covalently bound substituents. Computational simulations, supported by X‐ray crystallography, suggest that this tuning of properties occurs due to weak interactions between the axle and the macrocycle that are enforced by the mechanical bond. This work highlights the benefits of using the mechanical bond to refine existing luminophores, providing a new avenue for emitter optimization that can ultimately increase the performance of these molecules. We report rotaxanes containing a carbazole‐containing TADF luminophore in which the mechanical bond improves key photophysical properties, including the photoluminescence quantum yield and the singlet–triplet energy gap (ΔE ST). Computational simulations, supported by X‐ray crystallography, suggest this is due to weak interactions between the axle and macrocycle, enforced by the mechanical bond. |
| Databáze: | OpenAIRE |
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