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24 May 2022 TADF active carbene-metal-amide complexes exhibiting through-space charge transfer: an impact of metal atom
Annija Jece, Armands Ruduss, Kitija A. Stucere, Aivars Vembris, Kaspars Traskovskis
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Proceedings Volume 12149, Organic Electronics and Photonics: Fundamentals and Devices III; 1214909 (2022) https://doi.org/10.1117/12.2621156
Event: SPIE Photonics Europe, 2022, Strasbourg, France
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Abstract
The impact of metal atom on the photophysical properties of luminescent organometallic carbene-metal-amide complexes exhibiting through-space charge transfer is investigated. The substitution of copper atom with gold alters the excited state energy level configuration of the emitter. While in the copper-based emitters the lowest triplet excited state (T1) is related to a through-space charge transfer between the carbazolide donor and carbene-bound phenylsulphonyl acceptor, in the gold-bearing structural analogue T1 level is accompanied by an additional closely situated triplet state T2, which features a charge transfer between the carbazolide donor and imidazolidine carbene acceptor. Because of a significant spin-orbit coupling provided by Au atom T2 state exhibits relatively fast phosphorescence rate of 8×104 s-1. Consequently, the emissive process for the gold-functionalized compound can be characterized with a co-occurring thermally activated delayed fluorescence (TADF) and phosphorescence, in contrast to the copper-based structural analogues, where only TADF is observed.
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Annija Jece, Armands Ruduss, Kitija A. Stucere, Aivars Vembris, and Kaspars Traskovskis "TADF active carbene-metal-amide complexes exhibiting through-space charge transfer: an impact of metal atom", Proc. SPIE 12149, Organic Electronics and Photonics: Fundamentals and Devices III, 1214909 (24 May 2022); https://doi.org/10.1117/12.2621156
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KEYWORDS
Chemical species
Gold
Luminescence
Phosphorescence
Copper
Molecules
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