A Hybrid Halide Perovskite Birefringent Crystal

Birefringent crystals that can modulate the polarization of light play a significant role in modern optical devices including polarizing microscopes, optical isolators, and achromatic quarter‐wave plates. To date, commercial birefringent crystals are exclusively limited to purely inorganic compounds...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-05, Vol.61 (22), p.e202202746-n/a
Main Authors: Huang, Weiqi, Zhang, Xu, Li, Yanqiang, Zhou, Yang, Chen, Xin, Li, Xiaoqi, Wu, Fafa, Hong, Maochun, Luo, Junhua, Zhao, Sangen
Format: Article
Language:English
Subjects:
Birefringence
Birefringent Crystal
Cations
Conjugation
Crystals
Halide Perovskites
Inorganic compounds
Lead
Melamine
Microscopes
Optical Anisotropy
Perovskite structure
Perovskites
Polarization
Wave plates
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Summary:Birefringent crystals that can modulate the polarization of light play a significant role in modern optical devices including polarizing microscopes, optical isolators, and achromatic quarter‐wave plates. To date, commercial birefringent crystals are exclusively limited to purely inorganic compounds. Here we report a new organic–inorganic hybrid halide, MLAPbBr4 (MLA=melamine), which features a (110)‐oriented layered perovskite structure. Although the 6s2 lone‐pair electrons of Pb2+ cations are stereochemically inert, MLAPbBr4 exhibits a birefringence of 0.322@550 nm, which exceeds those of all commercial birefringent crystals. The first‐principles calculations reveal that this birefringence should be ascribed to the highly dislocated π‐conjugation of MLA cations and high distortion of PbBr6 octahedra. This work highlights the persistently neglected great potential of hybrid halide perovskites as birefringent crystals. MLAPbBr4 (MLA=melamine) features a layered perovskite structure consisting of highly distorted PbBr6 octahedra and planar MLA+ cations. As a result, it exhibits large birefringence up to 0.322@550 nm. This birefringence makes MLAPbBr4 capable of easily dividing incident light into two polarized rays (e‐ray and o‐ray).
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202202746