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<p>Developing chiral thermally activated delayed fluorescence (TADF) materials with excellent photophysical and chiroptical properties is crucial for advancing circularly polarized organic light-emitting diodes (CP-OLED). To overcome the inherent trade-off relationship between photoluminescent quantum yield (PLQY) and dissymmetry factor (<i>g</i>), a fixed degenerate exciton chirality (FD-EC) strategy based on the multiple resonance TADF chromophore is proposed, exhibiting improved deep-blue emission with the peak at 454 nm and a high PLQY of 0.96, and unique exciton chirality with amplified |<i>g</i><sub>abs</sub>| and |<i>g</i><sub>PL</sub>| values of 1.0 × 10<sup>-3</sup> and 1.6 × 10<sup>-3</sup>. The CP-OLED, incorporating the chiral blue emitter, exhibits standard blue emission with a narrow full width at half maximum of 30 nm, a superior external quantum efficiency of 27.8%, Commission Internationale de L’Eclairage coordinates of (0.14, 0.08), and distinct circularly polarized electroluminescence.</p>

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Exciton chirality for deep-blue circularly polarized multiple resonance TADF emitter

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Zhiping Yan,
  • Jiaxin Lin,
  • Li Yuan,
  • Xuming Zhuang,
  • Zhiqiang Li,
  • Hai Bi,
  • You-Xuan Zheng,
  • Yue Wang

摘要

Developing chiral thermally activated delayed fluorescence (TADF) materials with excellent photophysical and chiroptical properties is crucial for advancing circularly polarized organic light-emitting diodes (CP-OLED). To overcome the inherent trade-off relationship between photoluminescent quantum yield (PLQY) and dissymmetry factor (g), a fixed degenerate exciton chirality (FD-EC) strategy based on the multiple resonance TADF chromophore is proposed, exhibiting improved deep-blue emission with the peak at 454 nm and a high PLQY of 0.96, and unique exciton chirality with amplified |gabs| and |gPL| values of 1.0 × 10-3 and 1.6 × 10-3. The CP-OLED, incorporating the chiral blue emitter, exhibits standard blue emission with a narrow full width at half maximum of 30 nm, a superior external quantum efficiency of 27.8%, Commission Internationale de L’Eclairage coordinates of (0.14, 0.08), and distinct circularly polarized electroluminescence.