Carbene-Metal Complexes as Molecular Scaffolds for Construction of through-Space Thermally Activated Delayed Fluorescence Emitters
Inorganic Chemistry 2022
Armands Rudušs, Baiba Turovska, Sergejs Beļakovs, Kitija Alise Štucere, Aivars Vembris, Kaspars Traskovskis

The through-space charge transfer (CT) process is observed in Cu(I) carbene–metal–amide complexes, where conventional imidazole or imidazoline N-heterocyclic (NHC) carbene fragments act as inert linkers and CT proceeds between a metal-bound carbazole donor and a distantly situated carbene-bound phenylsulfonyl acceptor. The resulting electron transfer gives a rise to efficient thermally activated delayed fluorescence (TADF), characterized with high photoluminescence quantum yields (ΦPL up to 90%) and radiative rates (kr) up to 3.32 × 105 s–1. The TADF process is aided by fast reverse intersystem crossing (rISC) rates of up to 2.56 × 107 s–1. Such emitters can be considered as hybrids of two existing TADF emitter design strategies, combining low singlet–triplet energy gaps (ΔEST) met in all-organic exciplex-like emitters (0.0062–0.0075 eV) and small, but non-negligible spin–orbital coupling (SOC) provided by a Cu atom, like in TADF-active organometallic complexes.


DOI
10.1021/acs.inorgchem.1c03371
Hyperlink
https://pubs.acs.org/doi/10.1021/acs.inorgchem.1c03371

Rudušs, A., Turovska, B., Beļakovs, S., Štucere, K., Vembris, A., Traskovskis, K. Carbene-Metal Complexes as Molecular Scaffolds for Construction of through-Space Thermally Activated Delayed Fluorescence Emitters. Inorganic Chemistry, 2022, Vol. 61, No. 4, pp.2174-2185. ISSN 0020-1669. e-ISSN 1520-510X. Available from: doi:10.1021/acs.inorgchem.1c03371

Publication language
English (en)
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