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<p>Perovskite quantum dot light-emitting diodes (QLEDs) offer superior efficiency and high colour purity, making them promising candidates for next-generation lighting and display technologies. However, fabricating the emissive perovskite quantum dot (QD) layer typically requires a protective atmosphere due to its air sensitivity, thereby increasing production costs and limiting industrial scalability. Here, we propose an ion-pair pinning strategy by using tetraalkylammonium triflate (NR<sub>4</sub>OTf) to enable ambient-air processing of formamidinium lead bromide (FAPbBr<sub>3</sub>) QD films. The trifluoromethanesulfonic acid anions (OTf<sup>−</sup>) hydrogen bond with FA<sup>+</sup>, inhibiting its detachment and passivating the uncoordinated Pb<sup>2+</sup>, while the tetraalkylammonium cations (NR<sub>4</sub><sup>+</sup>) serve as X-type ligands to inhibit deprotonation. This dual ion-pair pinning effect stabilises the QD lattice and provides surface resistance to moisture and oxygen, thereby improving the uniformity, stability, and optoelectronic performance of air-processed QD films. The as-constructed air-processed QLED achieves a high external quantum efficiency (EQE) of 21.3% and a peak luminance of over 3 × 10<sup>4 </sup>cd m<sup>−2</sup> at 529 nm with Rec. 2020 compliance (EQE of 23.9% and luminance of over 8 × 10<sup>4 </sup>cd m<sup>−2</sup> for the N<sub>2</sub>-processed QLED). Our work eliminates the reliance on inert gas protection in perovskite QLED fabrication, laying a foundation for their low-cost, large-scale manufacturing and expansion into diversified applications.</p>

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Ion-pair pinning on perovskite quantum dots for high-efficiency air-processed light-emitting diodes with Rec. 2020 compliance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月6日

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  • Yuhang Cui,
  • Danlei Zhu,
  • Jiawei Chen,
  • Shuyue Dong,
  • Yuanzhuang Cheng,
  • Xiangyu Liu,
  • Xinghua Yan,
  • Zicong Jin,
  • Lian Duan,
  • Jian Xu,
  • Dongxin Ma

摘要

Perovskite quantum dot light-emitting diodes (QLEDs) offer superior efficiency and high colour purity, making them promising candidates for next-generation lighting and display technologies. However, fabricating the emissive perovskite quantum dot (QD) layer typically requires a protective atmosphere due to its air sensitivity, thereby increasing production costs and limiting industrial scalability. Here, we propose an ion-pair pinning strategy by using tetraalkylammonium triflate (NR4OTf) to enable ambient-air processing of formamidinium lead bromide (FAPbBr3) QD films. The trifluoromethanesulfonic acid anions (OTf−) hydrogen bond with FA+, inhibiting its detachment and passivating the uncoordinated Pb2+, while the tetraalkylammonium cations (NR4+) serve as X-type ligands to inhibit deprotonation. This dual ion-pair pinning effect stabilises the QD lattice and provides surface resistance to moisture and oxygen, thereby improving the uniformity, stability, and optoelectronic performance of air-processed QD films. The as-constructed air-processed QLED achieves a high external quantum efficiency (EQE) of 21.3% and a peak luminance of over 3 × 104 cd m−2 at 529 nm with Rec. 2020 compliance (EQE of 23.9% and luminance of over 8 × 104 cd m−2 for the N2-processed QLED). Our work eliminates the reliance on inert gas protection in perovskite QLED fabrication, laying a foundation for their low-cost, large-scale manufacturing and expansion into diversified applications.