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. 2020 May 19;10:8229. doi: 10.1038/s41598-020-65071-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Crystal structure of 0D Cs₄PbBr₆ with isolated PbBr₆-octahedra. (b) Picture of Cs₄PbBr₆ powder. (c) ²⁰⁷Pb NMR spectrum of Cs₄PbBr₆ (black) at RT acquired on a 16.4 T spectrometer. The simulated individual lines with intensities obtained from the coupling tree, a FWHM of 1.5 kHz and a scalar coupling of 2.0 kHz are displayed in light blue. The sum of the lines is shown in dark blue and is matching the experimental data. (d) High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy (HAADF-STEM) image of a single CsPbBr₃ NC. (e) Colloidal solution of CsPbBr₃ NCs under UV excitation. (f) ²⁰⁷Pb NMR spectra of CsPbBr₃ bulk (bottom) and NCs (top) acquired at RT on a 11.7 T instrument with identical measurement and processing parameters. The coupling pattern cannot be resolved for the NCs and the total line width increases to 17.6 kHz. This was attributed to higher PbBr₆-octahedral disorders over the whole nanocrystal compared to the bulk material.