Cesium Lead Chloride/Bromide Perovskite Quantum Dots with Strong Blue Emission Realized via a Nitrate-Induced Selective Surface Defect Elimination Process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

18 Scopus Citations
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Author(s)

  • Shixun Wang
  • Yu Wang
  • Yu Zhang
  • Xiangtong Zhang
  • Xinyu Shen
  • Xingwei Zhuang
  • Po Lu
  • William W. Yu
  • Stephen V. Kershaw

Detail(s)

Original languageEnglish
Pages (from-to)90-96
Journal / PublicationJournal of Physical Chemistry Letters
Volume10
Issue number1
Early online date19 Dec 2018
Publication statusPublished - 3 Jan 2019

Abstract

Cesium lead halide perovskites emitting blue light in the 460-470 nm range of wavelengths have so far been plagued with rather poor luminescent performance, placing inevitable limitations on the development of perovskite nanocrystal-based blue light-emitting devices. Herein, a selective surface defect elimination process with the help of hydrated nitrates was introduced into the perovskite/toluene solution to strip the undesired surface defects and vacancies and to boost the photoluminescence quantum yield of true-blue-light-emitting (at 466 nm) CsPb(Cl/Br)3 perovskite nanocrystals to the impressive value of 85%. Unlike the conventional passivation strategy, the anionic nitrate ions are able to desorb the undesired surface metallic lead and combine with excess surface metal ions, leaving perovskite quantum dots with better crystallinity and fewer surface defects.

Citation Format(s)

Cesium Lead Chloride/Bromide Perovskite Quantum Dots with Strong Blue Emission Realized via a Nitrate-Induced Selective Surface Defect Elimination Process. / Wang, Shixun; Wang, Yu; Zhang, Yu; Zhang, Xiangtong; Shen, Xinyu; Zhuang, Xingwei; Lu, Po; Yu, William W.; Kershaw, Stephen V.; Rogach, Andrey L.

In: Journal of Physical Chemistry Letters, Vol. 10, No. 1, 03.01.2019, p. 90-96.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review