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<p>Colloidal quantum well-based light-emitting diodes are highly promising for electroluminescent applications owing to their high fraction of horizontally aligned transition dipole moments, but scalable fabricating their films with dominant horizontal dipole orientation for electroluminescent devices remain major challenges. Here, we utilize a two-phase driving flat arrangement strategy combined with Langmuir–Schaefer technology to create compact colloidal quantum well films with predominantly horizontal dipole alignment. The interfacial driving force between the two liquid phases facilitates the formation of uniform, densely packed films, which exhibit 90% horizontal dipole alignment, yielding a light extraction efficiency of 35.8%. The resulting devices achieve (4 mm<sup>2</sup>) an external quantum efficiency of 25.5%, a maximum luminance of 59,620 cd m<sup>−2</sup>, and outstanding operational stability (<i>T</i><sub>95</sub>@100 cd m<sup>−2</sup> &gt; 16,233 h). Moreover, this technique enables scalable fabrication of uniform colloidal quantum well films (100 cm<sup>2</sup>), maintaining luminance above 60,000 cd m<sup>−2</sup> in 4 cm<sup>2</sup> devices, indicating industrial feasibility.</p>

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Horizontally oriented compact colloidal quantum well films enable efficient and stable electroluminescent diodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月1日

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  • Guohang Ba,
  • Yiyang Gong,
  • Mengqi Zhang,
  • Fei Huang,
  • Jing Li,
  • Junfeng Wang,
  • Lin Zhang,
  • Linhan Fan,
  • Xinfeng Liu,
  • Jianjun Tian

摘要

Colloidal quantum well-based light-emitting diodes are highly promising for electroluminescent applications owing to their high fraction of horizontally aligned transition dipole moments, but scalable fabricating their films with dominant horizontal dipole orientation for electroluminescent devices remain major challenges. Here, we utilize a two-phase driving flat arrangement strategy combined with Langmuir–Schaefer technology to create compact colloidal quantum well films with predominantly horizontal dipole alignment. The interfacial driving force between the two liquid phases facilitates the formation of uniform, densely packed films, which exhibit 90% horizontal dipole alignment, yielding a light extraction efficiency of 35.8%. The resulting devices achieve (4 mm2) an external quantum efficiency of 25.5%, a maximum luminance of 59,620 cd m−2, and outstanding operational stability (T95@100 cd m−2 > 16,233 h). Moreover, this technique enables scalable fabrication of uniform colloidal quantum well films (100 cm2), maintaining luminance above 60,000 cd m−2 in 4 cm2 devices, indicating industrial feasibility.