期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202746
关键词
Birefringent Crystal; Halide Perovskites; Optical Anisotropy
资金
- National Natural Science Foundation of China [22122507, 21833010, 61975207, 21921001]
- Youth Innovation Promotion of Chinese Academy of Sciences [Y202069]
- Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [ZDBS-LY-SLH024]
- Fujian Institute of Innovation [FJCXY18010201]
- National Key Research and Development Program of China [2019YFA0210400]
This study reports a new type of organic-inorganic hybrid halide perovskite crystal with high birefringence. Compared to all commercial birefringent crystals, this crystal exhibits higher birefringence. Additionally, first-principles calculations reveal the underlying reasons for its birefringent performance.
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, MLAPbBr(4) (MLA=melamine), which features a (110)-oriented layered perovskite structure. Although the 6s(2) lone-pair electrons of Pb2+ cations are stereochemically inert, MLAPbBr(4) 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 pi-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.
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