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<p>Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are promising for organic light-emitting diodes (OLEDs) owing to their narrowband emission and efficient triplet utilization. However, realizing stable deep-blue emission with high practical efficiency remains challenging, largely due to limited strategies for hypsochromic shifts without compromising photophysical properties. Here, we report a late-stage direct double borylation strategy for B/N-based MR frameworks, which extends π-conjugation resonance, increases transition energy, enhances transition dipole moment, and reduces the S<sub>1</sub>−T<sub>1</sub> energy gap. The proof-of-concept emitter, ν-DABNA-M-B-Mes, exhibits blue-shifted emission compared to its parent molecule while maintaining excellent TADF characteristics, including high photoluminescence quantum yield (93%), narrowband emission (16 nm), and fast reverse intersystem crossing rate (2.05 × 10<sup>5 </sup>s<sup>–1</sup>). OLEDs employing ν-DABNA-M-B-Mes achieve outstanding performance with &gt;30% external quantum efficiency, high luminous efficacy, and near NTSC color purity. Furthermore, phosphor-sensitized fluorescence device display a minimal efficiency roll-off and long operational lifetime (LT<sub>80</sub> &gt; 1000 h at 100 cd m<sup>–2</sup>), establishing a new benchmark for blue OLEDs.</p>

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Late-stage direct double borylation of B/N-based multi-resonance framework enables high-performance ultra-narrowband deep-blue organic light-emitting diodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月6日

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  • Jiping Hao,
  • Junki Ochi,
  • Kojiro Tanaka,
  • Masashi Mamada,
  • Kenkera Rayappa Naveen,
  • Yasuhiro Kondo,
  • Masakazu Kondo,
  • Takuji Hatakeyama

摘要

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are promising for organic light-emitting diodes (OLEDs) owing to their narrowband emission and efficient triplet utilization. However, realizing stable deep-blue emission with high practical efficiency remains challenging, largely due to limited strategies for hypsochromic shifts without compromising photophysical properties. Here, we report a late-stage direct double borylation strategy for B/N-based MR frameworks, which extends π-conjugation resonance, increases transition energy, enhances transition dipole moment, and reduces the S1−T1 energy gap. The proof-of-concept emitter, ν-DABNA-M-B-Mes, exhibits blue-shifted emission compared to its parent molecule while maintaining excellent TADF characteristics, including high photoluminescence quantum yield (93%), narrowband emission (16 nm), and fast reverse intersystem crossing rate (2.05 × 105 s–1). OLEDs employing ν-DABNA-M-B-Mes achieve outstanding performance with >30% external quantum efficiency, high luminous efficacy, and near NTSC color purity. Furthermore, phosphor-sensitized fluorescence device display a minimal efficiency roll-off and long operational lifetime (LT80 > 1000 h at 100 cd m–2), establishing a new benchmark for blue OLEDs.