Nano-Micro Letters, Volume. 16, Issue 1, 105(2024)
Proton-Prompted Ligand Exchange to Achieve High-Efficiency CsPbI3 Quantum Dot Light-Emitting Diodes
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
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)