High Color-Purity and Efficient Pure-Blue Perovskite Light-Emitting Diodes Based on Strongly Confined Monodispersed Quantum Dots

Aqiang Liu, Chenghao Bi, Jing Li, Mengqi Zhang, Chunyan Cheng, David Binks, Jianjun Tian

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Abstract

Here, we develop an in situ photoluminescence (PL) system to monitor the nucleation and growth of perovskite nanocrystals and control the monomer supply rate to achieve strongly confined and monodispersed quantum dots (QDs) with average size of 3.4 nm. Pure-blue (460 nm wavelength) CsPbBr 3 QDs with near unity PL quantum yield and narrow size distribution (small size dispersion of 9.6%) were thus produced. Light-emitting diodes (LEDs) based on these QDs were prepared by using an all-solution processing route, which showed narrow electroluminescence with full width at half-maximum of 20 nm and a high color purity of 97.3%. The device also had a high external quantum efficiency of 10.1%, maximum luminance of 11 610 cd m -2, and continuous operation lifetime of 21 h at the initial luminance of 102 cd m -2, corresponding to the state-of-art for pure-blue perovskite LEDs.

Original languageEnglish
Pages (from-to)2405–2411
JournalNano Letters
Volume23
Issue number6
Early online date7 Mar 2023
DOIs
Publication statusPublished - 22 Mar 2023

Keywords

  • high color-purity
  • perovskite light-emitting
  • pure-blue emission
  • quantum-dot
  • size distribution

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