TADF Active Carbene-Metal-Amide Complexes Exhibiting through-Space Charge Transfer: an Impact of Metal Atom

Proceedings of SPIE. Vol.12149: Organic Electronics and Photonics: Fundamentals and Devices III 2022
Annija Jēce, Armands Rudušs, Kitija Alise Štucere, Aivars Vembris, Kaspars Traskovskis

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.

Keywords
gold complex; N-heterocyclic carbene; phosphorescence; TADF; through-space charge transfer
DOI
10.1117/12.2621156
Hyperlink
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12149/2621156/TADF-active-carbene-metal-amide-complexes-exhibiting-through-space-charge/10.1117/12.2621156.short

Jēce, A., Rudušs, A., Štucere, K., Vembris, A., Traskovskis, K. TADF Active Carbene-Metal-Amide Complexes Exhibiting through-Space Charge Transfer: an Impact of Metal Atom. In: Proceedings of SPIE. Vol.12149: Organic Electronics and Photonics: Fundamentals and Devices III, France, Strasbourg, 3-7 April, 2022. Bellingham: SPIE, 2022, Article number 1214909. ISBN 9781510651746. e-ISBN 978151065175. ISSN 0277-786X. e-ISSN 1996-756X. Available from: doi:10.1117/12.2621156

Publication language
English (en)