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<p>Metal halide perovskite light-emitting diodes offer a promising platform for low-cost full-color displays, yet achieving high-performance pure-red emission remains challenging. Here, we report a crystallization regulation strategy for mixed bromide/iodide quasi-two-dimensional perovskites using a multifunctional molecule, 4-(trifluoromethyl)benzenesulfonamide, which simultaneously coordinates with organic spacer cations, Pb<sup>2+</sup> ions and halide ions. Moreover, the combination of large steric hindrance and ordered molecular assembly in the precursor solution plays a decisive role in directing the formation of nanocrystals, thereby suppressing defect formation, inhibiting halide ions migration, and enhancing exciton binding energy. The resulting light-emitting diodes exhibited pure-red emission at ~635 nm, delivering a peak external quantum efficiency of 30.2%, a maximum luminance exceeding 25,000 cd m<sup>-2</sup>, and a half-lifetime of 8426 min. Achieving perovskite light-emitting diodes with performance comparable to that of quantum-dot or organic light-emitting diodes would mark a major milestone toward commercialization. This work&#xa0;would&#xa0;expand opportunities beyond conventional light-emitting diode technologies.</p>

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High-performance red light-emitting diodes from quasi-two-dimensional perovskite nanocrystals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月7日

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  • Jibin Zhang,
  • Tianjun Liu,
  • Qichun Gu,
  • Shuailing Lin,
  • Jian Mao,
  • Zimu Wei,
  • Meng Wang,
  • Yang Lu,
  • Bo Cai,
  • Zher Ying Ooi,
  • Alessandro James Mirabelli,
  • Linyuan Lian,
  • Miguel Anaya,
  • Ying Liu,
  • Mochen Jia,
  • Xu Chen,
  • Yanbing Han,
  • Xinzhen Ji,
  • Yiwei Zhang,
  • Zhuangzhuang Ma,
  • Xinping Zhang,
  • Xin Zhou,
  • Xinjian Li,
  • Fanglong Yuan,
  • Lintao Hou,
  • Chongxin Shan,
  • Neil C. Greenham,
  • Samuel D. Stranks,
  • Zhifeng Shi

摘要

Metal halide perovskite light-emitting diodes offer a promising platform for low-cost full-color displays, yet achieving high-performance pure-red emission remains challenging. Here, we report a crystallization regulation strategy for mixed bromide/iodide quasi-two-dimensional perovskites using a multifunctional molecule, 4-(trifluoromethyl)benzenesulfonamide, which simultaneously coordinates with organic spacer cations, Pb2+ ions and halide ions. Moreover, the combination of large steric hindrance and ordered molecular assembly in the precursor solution plays a decisive role in directing the formation of nanocrystals, thereby suppressing defect formation, inhibiting halide ions migration, and enhancing exciton binding energy. The resulting light-emitting diodes exhibited pure-red emission at ~635 nm, delivering a peak external quantum efficiency of 30.2%, a maximum luminance exceeding 25,000 cd m-2, and a half-lifetime of 8426 min. Achieving perovskite light-emitting diodes with performance comparable to that of quantum-dot or organic light-emitting diodes would mark a major milestone toward commercialization. This work would expand opportunities beyond conventional light-emitting diode technologies.