Nano-Micro Letters, Volume. 16, Issue 1, 105(2024)

Proton-Prompted Ligand Exchange to Achieve High-Efficiency CsPbI3 Quantum Dot Light-Emitting Diodes

Yanming Li1,2、†, Ming Deng1,2,4、†, Xuanyu Zhang1,2,5、†, Lei Qian1,2,3, and Chaoyu Xiang1,2,3、*
Author Affiliations
  • 1Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Qianwan Institute of CNITECH, Ningbo 315300, People’s Republic of China
  • 2Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People’s Republic of China
  • 3Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, People’s Republic of China
  • 4Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, 315211 Zhejiang, People’s Republic of China
  • 5University of Nottingham Ningbo China, Ningbo, 315100, People’s Republic of China
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    CsPbI3 perovskite quantum dots (QDs) are ideal materials for the next generation of red light-emitting diodes. However, the low phase stability of CsPbI3 QDs and long-chain insulating capping ligands hinder the improvement of device performance. Traditional in-situ ligand replacement and ligand exchange after synthesis were often difficult to control. Here, we proposed a new ligand exchange strategy using a proton-prompted in-situ exchange of short 5-aminopentanoic acid ligands with long-chain oleic acid and oleylamine ligands to obtain stable small-size CsPbI3 QDs. This exchange strategy maintained the size and morphology of CsPbI3 QDs and improved the optical properties and the conductivity of CsPbI3 QDs films. As a result, high-efficiency red QD-based light-emitting diodes with an emission wavelength of 645 nm demonstrated a record maximum external quantum efficiency of 24.45% and an operational half-life of 10.79 h.

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    Yanming Li, Ming Deng, Xuanyu Zhang, Lei Qian, Chaoyu Xiang. Proton-Prompted Ligand Exchange to Achieve High-Efficiency CsPbI3 Quantum Dot Light-Emitting Diodes[J]. Nano-Micro Letters, 2024, 16(1): 105

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    Paper Information

    Category: Research Articles

    Received: Aug. 14, 2023

    Accepted: Dec. 11, 2023

    Published Online: Jan. 23, 2025

    The Author Email: Xiang Chaoyu (xiangchaoyu@nimte.ac.cn)

    DOI:10.1007/s40820-024-01321-8

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