In situ inclusion of thiocyanate for highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals

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

4 Scopus Citations
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Author(s)

  • Tao Cai
  • Fan Li
  • Yihua Jiang
  • Xueyuan Liu
  • Xuefeng Xia
  • Xiaofeng Wang
  • Jie Peng
  • Li Wang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)1319-1325
Journal / PublicationNanoscale
Volume11
Issue number3
Online published20 Dec 2018
Publication statusPublished - 21 Jan 2019

Abstract

In this work, an in situ thiocyanate inclusion method for the fabrication of highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals (NCs) is developed, employing Pb(SCN)2 as the lead precursor to partially or totally replace PbBr2 in the ligand-assisted reprecipitation (LARP) process. The in situ approach not only avoids the introduction of impurity elements, but also more interestingly incorporation of thiocyanate can control the crystallinity, particle size, luminescence and stability of CH3NH3PbBr3 NCs in a simple and effective manner. By adjusting the thiocyanate concentration, the photoluminescence (PL) of the synthesized CH3NH3PbBr3 NCs can be tuned in a range of 473-526 nm, as characterized by narrow emission line widths of 21-28 nm and outstanding photoluminescence quantum yields (PLQYs) of 73% to 96%. Meanwhile, the stability of CH3NH3PbBr3 NCs can be greatly improved as the amount of thiocyanate increases. The improvement in the optical performance and stability of CH3NH3PbBr3 NCs is mainly due to the contribution of higher crystallinity and, more stable and defect-free surface passivation induced by the presence of thiocyanate. This work paves a novel way for preparing highly luminescent and stable CH3NH3PbBr3 NCs.

Citation Format(s)

In situ inclusion of thiocyanate for highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals. / Cai, Tao; Li, Fan; Jiang, Yihua; Liu, Xueyuan; Xia, Xuefeng; Wang, Xiaofeng; Peng, Jie; Wang, Li; Daoud, Walid A.

In: Nanoscale, Vol. 11, No. 3, 21.01.2019, p. 1319-1325.

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