Issue 9, 2022

Hexamethyldisilazane-assisted Mn2+ doping of perovskite nanocrystals under ambient conditions

Abstract

Doping Mn2+ ions into lead halide perovskite (LHP) nanocrystals (NCs) has attracted great attention in the optoelectronic fields due to the stability enhancement and unique dual-color emission characteristics arising from the energy transfer from the LHP host to the dopants (i.e., Mn2+ ions). Herein, we report a facile and scalable synthetic protocol for Mn2+-doped CsPbCl3 and CsPbBrxCl3−x nanoplates via a one-pot room-temperature (RT) procedure in the presence of hexamethyldisilazane (HMDS). It is noteworthy that both HMDS and Mn2+ ions play a critical role in triggering the crystallization of the Mn-doped LHP NCs under ambient conditions by functioning as a passivation agent with Lewis base groups that coordinate with Pb2+ ions. The optical properties including the emission wavelength and the relative PL intensity of the band-to-band emission and the Mn2+ emission are tuned by changing the amount of HMDS and the precursor ratios Mn : Pb and Br : Cl. It is interesting that the representative Mn-doped CsPbCl3 NCs displayed enhanced thermal stability, which was confirmed by the observation that the emission intensity of the sample annealed below 95 °C for 2 h increases compared with that of the fresh sample. Ion exchanges between not only Cl, Br and I but also Mn2+ and Pb2+ are also investigated.

Graphical abstract: Hexamethyldisilazane-assisted Mn2+ doping of perovskite nanocrystals under ambient conditions

Supplementary files

Article information

Article type
Paper
Submitted
19 Nov 2021
Accepted
02 Feb 2022
First published
02 Feb 2022

CrystEngComm, 2022,24, 1803-1811

Hexamethyldisilazane-assisted Mn2+ doping of perovskite nanocrystals under ambient conditions

K. Hu, Y. Hu, T. Li, F. Qiao, Y. Chen, J. Han, L. Li, G. Ali and Y. Xie, CrystEngComm, 2022, 24, 1803 DOI: 10.1039/D1CE01548F

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