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<p>Metal nanoclusters, as unique metallic molecules comprising a few to hundreds of metal atoms and stabilized by organic monolayer ligands, have recently emerged as a novel class of chromophores and hold great promise for flexible light-emitting diodes. However, the fabrication of flexible metal nanoclusters-based light-emitting diodes is still hindered by low photoluminescence quantum yields, suboptimal solution processability, and consequently compromised emitter-film quality with random dipole orientations. This work addresses these limitations through strategic molecular engineering by employing 1, 3-di(9H-carbazol-9-yl)benzene as a π-conjugated mediator. This approach enables supramolecular assembly to achieve π-π coupling-mediated horizontal dipole alignment in nanocluster solid films, allowing an external quantum efficiency of up to 26.4% in flexible light-emitting diodes with a maximum brightness of 41,365 cd m<sup>−2</sup>, and retaining more than 94% of initial efficiency after 2000 bending cycles at 3 mm curvature radius.</p>

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Flexible light-emitting diodes with EQE approaching 26.4% from horizontal dipole-oriented metal nanoclusters

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月21日

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  • Zhenyu Wang,
  • Yingguo Yang,
  • Guizhong Luo,
  • Wenwu Xu,
  • Chengyu Liu,
  • Tianqi Yang,
  • Wenyu Ji,
  • Fujun Zhang,
  • Min Lu,
  • Yu Zhang,
  • Zhennan Wu,
  • Xue Bai

摘要

Metal nanoclusters, as unique metallic molecules comprising a few to hundreds of metal atoms and stabilized by organic monolayer ligands, have recently emerged as a novel class of chromophores and hold great promise for flexible light-emitting diodes. However, the fabrication of flexible metal nanoclusters-based light-emitting diodes is still hindered by low photoluminescence quantum yields, suboptimal solution processability, and consequently compromised emitter-film quality with random dipole orientations. This work addresses these limitations through strategic molecular engineering by employing 1, 3-di(9H-carbazol-9-yl)benzene as a π-conjugated mediator. This approach enables supramolecular assembly to achieve π-π coupling-mediated horizontal dipole alignment in nanocluster solid films, allowing an external quantum efficiency of up to 26.4% in flexible light-emitting diodes with a maximum brightness of 41,365 cd m−2, and retaining more than 94% of initial efficiency after 2000 bending cycles at 3 mm curvature radius.