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Chotard, Florian, Sivchik, Vasily, Linnolahti, Mikko, Bochmann, Manfred 
ORCID: https://orcid.org/0000-0001-7736-5428 and Romanov, Alexander
(2020)
Mono- versus bicyclic carbene metal amide photoemitters: Which design leads to the best performance?
Chemistry of Materials, 32 (14).
6114–6122.
ISSN 0897-4756
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Abstract
New luminescent "carbene-metal-amide"(CMA) Cu, Ag, and Au complexes based on monocyclic (C6) or bicyclic six-ring (BIC6) cyclic (alkyl)(amino)carbene ligands illustrate the effects of LUMO energy stabilization, conformational flexibility, excited state energy, and geometry on the photoluminescent properties, leading to 100% luminescence quantum yields, short excited state lifetimes Cu > Au > Ag down to 0.5 μs, and high radiative rates of 106 s-1. Gold complexes with the BIC6 ligand exhibit exceptional photostability under hard and soft UV light compared with analogous complexes with C5 and C6 carbenes. Steady-state and time-resolved photoluminescence spectroscopy at 298 and 77 K enabled an estimate of the energy levels of the charge transfer (CT) and locally excited (LE) states with singlet and triplet character. A four-state model is applied to describe thermally activated delayed fluorescence (TADF) properties in CMA materials and correlates excited state lifetimes with the energy difference between LE and CT states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | coordination chemistry,luminescence,photoemission |
| Faculty \ School: | Faculty of Science > School of Chemistry |
| UEA Research Groups: | Faculty of Science > Research Groups > Chemistry of Light and Energy Faculty of Science > Research Groups > Chemistry of Materials and Catalysis |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 26 Jun 2020 00:02 |
| Last Modified: | 29 Jun 2023 12:31 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/75777 |
| DOI: | 10.1021/acs.chemmater.0c01769 |
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