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Title: Locally collective hydrogen bonding isolates lead octahedra for white emission improvement
Authors: Cui, BB
Han, Y
Huang, BL 
Zhao, YZ
Wu, XX
Liu, L
Cao, GY
Du, Q
Liu, N
Zou, W
Sun, MZ 
Wang, L
Liu, XF
Wang, JP
Zhou, HP
Chen, Q
Issue Date: 2019
Source: Nature communications, 15 Nov. 2019, v. 10, 5190, p. 1-8
Abstract: As one of next-generation semiconductors, hybrid halide perovskites with tailorable optoelectronic properties are promising for photovoltaics, lighting, and displaying. This tunability lies on variable crystal structures, wherein the spatial arrangement of halide octahedra is essential to determine the assembly behavior and materials properties. Herein, we report to manipulate their assembling behavior and crystal dimensionality by locally collective hydrogen bonding effects. Specifically, a unique urea-amide cation is employed to form corrugated 1D crystals by interacting with bromide atoms in lead octahedra via multiple hydrogen bonds. Further tuning the stoichiometry, cations are bonded with water molecules to create a larger spacer that isolates individual lead bromide octahedra. It leads to zero-dimension (OD) single crystals, which exhibit broadband 'warm' white emission with photoluminescence quantum efficiency 5 times higher than 1D counterpart. This work suggests a feasible strategy to modulate the connectivity of octahedra and consequent crystal dimensionality for the enhancement of their optoelectronic properties.
Publisher: Nature Publishing Group
Journal: Nature communications 
EISSN: 2041-1723
DOI: 10.1038/s41467-019-13264-5
Rights: 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 thearticle’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/.
© The Author(s) 2019
The following publication Cui, B., Han, Y., Huang, B. et al. Locally collective hydrogen bonding isolates lead octahedra for white emission improvement. Nat Commun 10, 5190, 1-8 is available at https://dx.doi.org/10.1038/s41467-019-13264-5
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