Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals

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

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Author(s)

  • Xinyu Shen
  • Yu Zhang
  • Xingwei Zhuang
  • Dingke Xue
  • Xiangtong Zhang
  • Jinlei Wu
  • Jinyang Zhu
  • Zhifeng Shi
  • Stephen V. Kershaw
  • William W. Yu

Detail(s)

Original languageEnglish
Article number1901828
Journal / PublicationSmall
Volume15
Issue number34
Online published5 Jul 2019
Publication statusPublished - 23 Aug 2019

Abstract

All-inorganic cesium lead halide perovskite nanocrystals (NCs) have demonstrated excellent optical properties and an encouraging potential for optoelectronic applications; however, mixed-halide perovskites, especially CsPb(Cl/Br)3 NCs, still show lower photoluminescence quantum yields (PL QY) than the corresponding single-halide materials. Herein, anhydrous oxalic acid is used to post-treat CsPb(Cl/Br)3 NCs in order to initially remove surface defects and halide vacancies, and thus, to improve their PL QY from 11% to 89% for the emission of 451 nm. Furthermore, due to the continuous chelating reaction with the oxalate ion, chloride anions from the mixed-halide CsPb(Cl/Br)3 perovskite NCs could be extracted, and green emitting CsPbBr3 NCs with PL QY of 85% at 511 nm emission are obtained. Besides being useful to improve the emission of CsPb(Cl/Br)3 NCs, the oxalic acid treatment strategy introduced here provides a further tool to adjust the distribution of halide anions in mixed-halide perovskites without using any halide additives.

Research Area(s)

  • blue-emitting materials, chelating action, mixed-halide perovskites, nanocrystals

Citation Format(s)

Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals. / Wang, Shixun; Shen, Xinyu; Zhang, Yu; Zhuang, Xingwei; Xue, Dingke; Zhang, Xiangtong; Wu, Jinlei; Zhu, Jinyang; Shi, Zhifeng; Kershaw, Stephen V.; Yu, William W.; Rogach, Andrey L.

In: Small, Vol. 15, No. 34, 1901828, 23.08.2019.

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