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Updated: Sep 9, 2025
07:24
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
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Competitive Chirality Induction in Two-dimensional Germanium Iodide Perovskites Enabling Highly Anisotropic Nonlinear
Yan Fu1,2, Kai Li1, Xiaoqi Li1,3
1State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P.R. China.
Angewandte Chemie (International Ed. in English)
|September 4, 2025
Summary
Chiral metal halide perovskites exhibit enhanced chirality through two novel mechanisms: chiral cation transfer and lone pair symmetry breaking. This leads to superior nonlinear optical properties for advanced optoelectronic applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Chiral metal halide perovskites (CMHPs) are crucial for chiral-optoelectronic and spintronic devices.
- Current chirality induction relies on chiral ligands, limiting material diversity.
- Understanding new chiral induction mechanisms is vital for CMHP development.
Purpose of the Study:
- To explore novel mechanisms for chirality induction in germanium iodide perovskites.
- To investigate the role of chiral organic cations and stereochemically active lone pairs.
- To evaluate the chiroptical and nonlinear optical properties of newly synthesized CMHPs.
Main Methods:
- Synthesis of homochiral (R/S-BrMBA)2GeI4 via chiral cation transfer.
- Formation of enantiomorphous helical P/M-(rac-BrMBA)2GeI4 through spontaneous symmetry breaking.
- Characterization of nonlinear optical properties, including anisotropy factors and laser damage thresholds.
Main Results:
- Achieved controlled chirality induction through two distinct pathways.
- Demonstrated exceptional anisotropic nonlinear optical properties in (R-BrMBA)2GeI4 and P-(rac-BrMBA)2GeI4.
- Reported large anisotropy factors (gSHG-CD up to 0.83) and high laser damage thresholds.
Conclusions:
- Established a new understanding of chiral induction in metal halide perovskites.
- Highlighted the potential of CMHPs with dual chiral induction mechanisms for advanced applications.
- Provided insights into the interplay between organic ligands and inorganic networks for functional material design.
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