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<p>Deuteration has emerged as an effective isotopic strategy to enhance the intrinsic stability of organic emitters by lowering vibrational zero-point energy and suppressing degradation pathways. However, deuterated multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are still rare and are mainly restricted to green emitters. Herein, a deuterated deep-blue MR-TADF emitter, <b>PAB-d</b>, was synthesized via a one-shot borylation, in which a milder reaction temperature (80 °C) was adopted to mitigate undesired H/D exchange. <b>PAB-d</b> preserves the narrowband deep-blue emission while delivering an enhanced photoluminescence quantum yield (<i>Φ</i><sub>PL</sub> = 95%) and a suppressed nonradiative decay rate, with <i>k</i><sub>nr</sub> reduced to ∼39% of that of the non-deuterated analogue. Vacuum-deposited OLEDs incorporating <b>PAB-d</b> exhibit excellent efficiency (EQE<sub>max</sub> = 28.2%) with CIE coordinates of (0.144, 0.073). Notably, the operational stability was substantially improved for <b>PAB-d</b>, affording 1.8-fold longer than that of <b>PAB</b>, consistent with the benefit of a high deuteration degree (∼ 93%) in MR-TADF systems.</p>

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Deuterium deep-blue multi-resonance thermally activated delayed fluorescence emitters enable long-lived organic light-emitting diodes

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Mao Quan,
  • Ze-Lin Zhu,
  • Xu Zhang,
  • Zhanxiang Chen,
  • Ruijie Ming,
  • Jingsheng Miao,
  • Chuluo Yang

摘要

Deuteration has emerged as an effective isotopic strategy to enhance the intrinsic stability of organic emitters by lowering vibrational zero-point energy and suppressing degradation pathways. However, deuterated multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are still rare and are mainly restricted to green emitters. Herein, a deuterated deep-blue MR-TADF emitter, PAB-d, was synthesized via a one-shot borylation, in which a milder reaction temperature (80 °C) was adopted to mitigate undesired H/D exchange. PAB-d preserves the narrowband deep-blue emission while delivering an enhanced photoluminescence quantum yield (ΦPL = 95%) and a suppressed nonradiative decay rate, with knr reduced to ∼39% of that of the non-deuterated analogue. Vacuum-deposited OLEDs incorporating PAB-d exhibit excellent efficiency (EQEmax = 28.2%) with CIE coordinates of (0.144, 0.073). Notably, the operational stability was substantially improved for PAB-d, affording 1.8-fold longer than that of PAB, consistent with the benefit of a high deuteration degree (∼ 93%) in MR-TADF systems.