Locally collective hydrogen bonding isolates lead octahedra for white emission improvement

Bin-Bin Cui (), Ying Han, Bolong Huang (), Yizhou Zhao, Xianxin Wu, Lang Liu, Guangyue Cao, Qin Du, Na Liu, Wei Zou, Mingzi Sun, Lin Wang, Xinfeng Liu, Jianpu Wang, Huanping Zhou and Qi Chen ()
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Bin-Bin Cui: Beijing Institute of Technology (BIT)
Ying Han: Beijing Institute of Technology (BIT)
Bolong Huang: The Hong Kong Polytechnic University Hung Hom, Kowloon
Yizhou Zhao: School of Materials Science and Engineering, BIT
Xianxin Wu: National Center for Nanoscience and Technology
Lang Liu: School of Materials Science and Engineering, BIT
Guangyue Cao: Beijing Institute of Technology (BIT)
Qin Du: School of Materials Science and Engineering, BIT
Na Liu: School of Materials Science and Engineering, BIT
Wei Zou: Nanjing Tech University
Mingzi Sun: The Hong Kong Polytechnic University Hung Hom, Kowloon
Lin Wang: School of Mechatronical Engineering, BIT
Xinfeng Liu: National Center for Nanoscience and Technology
Jianpu Wang: Nanjing Tech University
Huanping Zhou: Peking University
Qi Chen: Beijing Institute of Technology (BIT)

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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 (0D) 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.

Date: 2019
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DOI: 10.1038/s41467-019-13264-5

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