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

Yanming Li, Ming Deng, Xuanyu Zhang, Lei Qian, Chaoyu Xiang

Research output: Journal PublicationArticlepeer-review

15 Citations (Scopus)

Abstract

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.[Figure not available: see fulltext.].

Original languageEnglish
Article number105
JournalNano-Micro Letters
Volume16
Issue number1
DOIs
Publication statusPublished - Dec 2024

Keywords

  • CsPbI perovskite quantum dots
  • Ligand exchange
  • Light-emitting diodes
  • Proton-prompted in-situ exchange

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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