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24 May 2022 Symmetrical versus asymmetrical molecular configuration in metal-assisted-through-space charge transfer TADF
Armands Ruduss, Zanis Sisojevs, Aivars Vembris, Kitija Stucere, Kaspars Traskovskis
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Proceedings Volume 12149, Organic Electronics and Photonics: Fundamentals and Devices III; 1214908 (2022) https://doi.org/10.1117/12.2620983
Event: SPIE Photonics Europe, 2022, Strasbourg, France
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Abstract
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 ΔΕST 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.
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Armands Ruduss, Zanis Sisojevs, Aivars Vembris, Kitija Stucere, and Kaspars Traskovskis "Symmetrical versus asymmetrical molecular configuration in metal-assisted-through-space charge transfer TADF", Proc. SPIE 12149, Organic Electronics and Photonics: Fundamentals and Devices III, 1214908 (24 May 2022); https://doi.org/10.1117/12.2620983
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KEYWORDS
Luminescence
Organic light emitting diodes
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