Ms. Annija Jēce Profile

Annija Jēce

at Riga Technical University

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Proceedings Article | 24 May 2022 Poster + Paper

TADF active carbene-metal-amide complexes exhibiting through-space charge transfer: an impact of metal atom

Annija Jece, Armands Ruduss, Kitija Stucere, Aivars Vembris, Kaspars Traskovskis

Proceedings Volume 12149, 1214909 (2022) https://doi.org/10.1117/12.2621156

KEYWORDS: Chemical species, Luminescence, Gold, Phosphorescence, Copper, Molecules

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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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