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

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

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-63908-y

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