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<p>Boron/nitrogen (B/N)-doped multi-resonance thermally activated delayed fluorescence (TADF) molecules have emerged as benchmark narrowband emitters for organic light-emitting diodes (OLEDs). However, these emitters face persistent challenges in synthesis and optoelectronic performance, notably aggregation-induced spectral-broadening and inefficient reverse intersystem crossing (RISC). Here, we introduce a molecular design that incorporates a B–N–B covalent-bond into a multiple resonance (MR) framework, synergistically combining narrowband emission of <i>para</i>-positioned B/N with a helically distorted B–N–B configuration that enhances spin-orbit coupling and suppresses molecular aggregations. A lithium-free, stepwise nitrogen-directed borylation enables high-synthesis-yield ( &gt; 80%) targeted emitters, affording deep-blue (452 nm) and greenish (495 nm) TADF emissions with full-width-at-half-maximum of merely 12–14 nm, near-unity photoluminescence quantum yields and accelerated RISC rates ( &gt; 10<sup>5 </sup>s<sup>−1</sup>). Corresponding OLEDs simultaneously achieve high maximum external quantum efficiencies of 37.9–38.3%, narrow electroluminescence bandwidths of 15–17 nm and decent operational stabilities. This work establishes B–N–B integrated MR-TADF systems as a versatile platform toward high-performance organic optoelectronics.</p>

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B–N–B Embedded multiple-resonance polyaromatic enabling efficient narrowband electroluminescence

  • 期刊论文

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  • 发表日期：

    2026年3月24日

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  • Jianping Zhou,
  • Guoyun Meng,
  • Hai Zhang,
  • Chenglong Li,
  • Qian Wang,
  • Dawei Zhang,
  • Lian Duan,
  • Dongdong Zhang

摘要

Boron/nitrogen (B/N)-doped multi-resonance thermally activated delayed fluorescence (TADF) molecules have emerged as benchmark narrowband emitters for organic light-emitting diodes (OLEDs). However, these emitters face persistent challenges in synthesis and optoelectronic performance, notably aggregation-induced spectral-broadening and inefficient reverse intersystem crossing (RISC). Here, we introduce a molecular design that incorporates a B–N–B covalent-bond into a multiple resonance (MR) framework, synergistically combining narrowband emission of para-positioned B/N with a helically distorted B–N–B configuration that enhances spin-orbit coupling and suppresses molecular aggregations. A lithium-free, stepwise nitrogen-directed borylation enables high-synthesis-yield ( > 80%) targeted emitters, affording deep-blue (452 nm) and greenish (495 nm) TADF emissions with full-width-at-half-maximum of merely 12–14 nm, near-unity photoluminescence quantum yields and accelerated RISC rates ( > 105 s−1). Corresponding OLEDs simultaneously achieve high maximum external quantum efficiencies of 37.9–38.3%, narrow electroluminescence bandwidths of 15–17 nm and decent operational stabilities. This work establishes B–N–B integrated MR-TADF systems as a versatile platform toward high-performance organic optoelectronics.