Symmetrical versus Asymmetrical Molecular Configuration in Metal-Assisted-through-Space Charge Transfer TADF

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

The synthesis of a novel imidazolidine type N-heterocyclic carbene (NHC) Cu (I) complex with asymmetrically attached phenylsulfonyl- acceptor group is presented. The asymmetrical ligand was used for the preparation two Cu(I) carbene-metal-amide (CMA) complexes with carbazolide (complex 1) or 1,8-dimethylcarbazolide (complex 2) as the amide donors. Obtained complexes exhibit efficient thermally activated delayed fluorescence (TADF) with luminescence quantum yields (QY) reaching 0.80 in PMMA matrix. Metal promoted through-space charge transfer approach in the emitter design lowers the ?EST gap and the small spin-orbit coupling (SOC) provided by metal atom enables high radiative rates (kr = 2.21×105 s-1 for complex 2). The photophysical properties of the asymmetrical (1-2) and previously reported symmetrical (3-6) molecular designs are compared. Obtained results suggest a closely similar photophysical behavior for both the asymmetrical and symmetrical CMA complexes.

Atslēgas vārdi
carbene-metal-amides; N-heterocyclic carbenes; Thermally activated delayed fluorescence; through-space charge transfer
DOI
10.1117/12.2620983
Hipersaite
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12149/2620983/Symmetrical-versus-asymmetrical-molecular-configuration-in-metal-assisted-through-space/10.1117/12.2620983.short?SSO=1

Rudušs, A., Sisojevs, Ž., Vembris, A., Štucere, K., Traskovskis, K. Symmetrical versus Asymmetrical Molecular Configuration in Metal-Assisted-through-Space Charge Transfer TADF. No: Proceedings of SPIE. Vol.12149: Organic Electronics and Photonics: Fundamentals and Devices III, Francija, Strasbourg, 3.-7. aprīlis, 2022. Bellingham: SPIE, 2022, Article number 1214908. ISBN 9781510651746. e-ISBN 978151065175. ISSN 0277-786X. e-ISSN 1996-756X. Pieejams: doi:10.1117/12.2620983

Publikācijas valoda
English (en)