Pure-red electroluminescence of quantum-confined CsPbI3 perovskite nanocrystals obtained by the gradient purification method

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Xiangtian Xiao
  • Ye Wu
  • Jiayun Sun
  • Desui Chen
  • Bing Tang
  • Wallace C.H. Choy
  • Andrey L. Rogach

Detail(s)

Original languageEnglish
Article number101533
Journal / PublicationMaterials Today Energy
Volume41
Online published15 Feb 2024
Publication statusPublished - Apr 2024

Abstract

Pure-red emission light-emitting diodes (LEDs) are highly desirable for display and lighting applications. Here, we present a synergistic approach to fabricate pure-red emission LEDs based on quantum-confined CsPbI3 nanocrystals (NCs). By introducing ZnI2 acting as a co-precursor and passivating agent into the synthesis, and applying a gradient post-synthesis purification method allowing us to obtain size-selected fractions with precisely adjusted emission colors, we obtained uniform and small (about 6 nm), quantum-confined CsPbI3 NCs exhibiting high stability in ambient conditions and a superior photoluminescence quantum yield of up to 88%. These NCs exhibited the tendency to undergo oriented attachment, resulting in self-assembled superstructures with a pure-red emission at 629 nm. Importantly, partial recrystallization into fused superstructures led to removal of the insulating ligand barriers between NCs. LEDs based on the CsPbI3 NCs showed pure-red electroluminescence at 633 nm, with an external quantum efficiency of 14.7% and a luminance of over 1000 cd/m2. Our study reveals the mechanism behind the oriented attachment and assembly of small, quantum-confined CsPbI3 NCs, and contributes to the development of pure-red electroluminescent LEDs. © 2024 Elsevier Ltd

Research Area(s)

  • Lead iodide perovskite, Light-emitting device, Pure-red emission, Quantum dots, Size-selective precipitation

Citation Format(s)

Pure-red electroluminescence of quantum-confined CsPbI3 perovskite nanocrystals obtained by the gradient purification method. / Liu, Haochen; Xiao, Xiangtian; Wu, Ye et al.
In: Materials Today Energy, Vol. 41, 101533, 04.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review