Issue 3, 2019

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
01 Oct 2018
Accepted
17 Dec 2018
First published
20 Dec 2018

Nanoscale, 2019,11, 1319-1325

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

T. Cai, F. Li, Y. Jiang, X. Liu, X. Xia, X. Wang, J. Peng, L. Wang and W. A. Daoud, Nanoscale, 2019, 11, 1319 DOI: 10.1039/C8NR07987K

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