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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

Author

Listed:
  • Jiping Hao

    (Sakyo-ku)

  • Junki Ochi

    (Sakyo-ku)

  • Kojiro Tanaka

    (Sakyo-ku)

  • Masashi Mamada

    (Sakyo-ku)

  • Kenkera Rayappa Naveen

    (Sakyo-ku)

  • Yasuhiro Kondo

    (Ltd.)

  • Masakazu Kondo

    (Ltd. 5-1 Goi Kaigan)

  • Takuji Hatakeyama

    (Sakyo-ku)

Abstract

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.

Suggested Citation

  • Jiping Hao & Junki Ochi & Kojiro Tanaka & Masashi Mamada & Kenkera Rayappa Naveen & Yasuhiro Kondo & Masakazu Kondo & Takuji Hatakeyama, 2025. "Late-stage direct double borylation of B/N-based multi-resonance framework enables high-performance ultra-narrowband deep-blue organic light-emitting diodes," Nature Communications, Nature, vol. 16(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-63908-y
    DOI: 10.1038/s41467-025-63908-y
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    1. Hironori Kaji & Hajime Suzuki & Tatsuya Fukushima & Katsuyuki Shizu & Katsuaki Suzuki & Shosei Kubo & Takeshi Komino & Hajime Oiwa & Furitsu Suzuki & Atsushi Wakamiya & Yasujiro Murata & Chihaya Adach, 2015. "Purely organic electroluminescent material realizing 100% conversion from electricity to light," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    2. Anton Pershin & David Hall & Vincent Lemaur & Juan-Carlos Sancho-Garcia & Luca Muccioli & Eli Zysman-Colman & David Beljonne & Yoann Olivier, 2019. "Highly emissive excitons with reduced exchange energy in thermally activated delayed fluorescent molecules," Nature Communications, Nature, vol. 10(1), pages 1-5, December.
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