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<p>Achieving efficient, stable deep-blue organic light-emitting diodes (OLEDs) with high colour purity remains challenging due to the scarcity of emitters combining narrowband emission and high stability. Here we present a multiple-resonance emitter featuring a highly twisted helical configuration with spatially confined frontier molecular orbitals. This emitter decouples radiative transitions from structural distortion while mitigating spectral broadening from carbon–hydrogen bond repulsion and aggregation, exhibiting sharp emission at 460 nm with a full-width at half-maximum of only 12 nm in solution and nearly identical spectra across varying-polarity systems. A unicolour-hybrid-tandem OLED design integrating complementary exciton-harvesting mechanisms to overcome the efficiency–lifetime trade-off is proposed, achieving an external quantum efficiency of 39.7% and a lifetime of 539 h to 90% of 1,000 cd m⁻<sup>2</sup> at a chromaticity <i>y</i> coordinate of 0.10. A stacking sequence of emitting units induces a twofold lifetime variation arising from outcoupling efficiency and photoelectric co-ageing differences. This co-engineering strategy advances commercially viable ultrapure-blue OLED displays.</p>

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Narrowband helical emitter with frontier orbital confinement for stable deep-blue hybrid-tandem organic light-emitting diodes

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Chuanqin Cheng,
  • Minqiang Mai,
  • Chenglong Li,
  • Dongdong Zhang,
  • Lian Duan

摘要

Achieving efficient, stable deep-blue organic light-emitting diodes (OLEDs) with high colour purity remains challenging due to the scarcity of emitters combining narrowband emission and high stability. Here we present a multiple-resonance emitter featuring a highly twisted helical configuration with spatially confined frontier molecular orbitals. This emitter decouples radiative transitions from structural distortion while mitigating spectral broadening from carbon–hydrogen bond repulsion and aggregation, exhibiting sharp emission at 460 nm with a full-width at half-maximum of only 12 nm in solution and nearly identical spectra across varying-polarity systems. A unicolour-hybrid-tandem OLED design integrating complementary exciton-harvesting mechanisms to overcome the efficiency–lifetime trade-off is proposed, achieving an external quantum efficiency of 39.7% and a lifetime of 539 h to 90% of 1,000 cd m⁻2 at a chromaticity y coordinate of 0.10. A stacking sequence of emitting units induces a twofold lifetime variation arising from outcoupling efficiency and photoelectric co-ageing differences. This co-engineering strategy advances commercially viable ultrapure-blue OLED displays.