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Peripherally non-planar multiple resonance induced thermally activated delayed fluorescence materials containing silyl units

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  • Corresponding authors: yxzheng@nju.edu.cn (Y.Z.);  zhoul@ciac.ac.cn (L.Z.)
    1. Four MR-TADF materials modified with non-planar silyl units suppress intermolecular aggregation and increase the properties.

      Organic light-emitting diodes with four materials show good performances with high external quantum efficiencies of up to 34.6%.

      One of the material and corresponding OLED exhibit pure green emission with CIE coordinates of (0.14, 0.70).

  • The rigid planar structure of multiple resonance thermally activated delayed fluorescence (MR-TADF) molecules based on boron/nitrogen (B/N) frameworks always causes a substantial roll-off in organic light-emitting diodes (OLEDs) due to intermolecular aggregation. Herein, four MR-TADF emitters (tCzMe3Si, tCzPh3Si, tPhCzMe3Si, and tPhCzPh3Si) were synthesized by introducing non-planar trimethyl/triphenyl silyl (Me3Si and Ph3Si) units at the para-carbon position of a B-substituted phenyl ring to reduce the intermolecular interaction. We further modified the peripheral electron donors of the B/N core, replacing 3,6-di-tert-butyl-9H-carbazole with 3,6-bis(4-(tert-butyl)phenyl)-9H-carbazole, resulting in a pure green emission with high photoluminescence quantum yields (up to 96%). Specifically, OLED based on tPhCzPh3Si exhibited a high external quantum efficiency of 34.6% and a pure green light peaking at 512 nm, with Commission Internationale de l’Eclairage coordinates of (0.14, 0.70).
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  • Cite this article:

    Ni H., Sun W., Luo X., et al., (2023). Peripherally non-planar multiple resonance induced thermally activated delayed fluorescence materials containing silyl units. The Innovation Materials 1(3), 100041. https://doi.org/10.59717/j.xinn-mater.2023.100041
    Ni H., Sun W., Luo X., et al., (2023). Peripherally non-planar multiple resonance induced thermally activated delayed fluorescence materials containing silyl units. The Innovation Materials 1(3), 100041. https://doi.org/10.59717/j.xinn-mater.2023.100041

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