AI Article Synopsis
- Chiral metal halide perovskites are gaining attention for their potential in second-order nonlinear optics (NLO) due to their unique asymmetric structures.
- Researchers have successfully synthesized two chiral hybrid bismuth halides with promising traits: a high second harmonic generation effect and an impressive laser-induced damage threshold.
- The new materials demonstrate enhanced circular polarization sensitivity, making them competitive alternatives to traditional lead-based chiral perovskites and offering a pathway for multifunctional applications in nonlinear photonics.
Article Abstract
Chiral metal halide perovskites with intrinsic asymmetric structures have drawn increased research interest for the application of second-order nonlinear optics (NLO). However, designing chiral perovskites with the features of a large NLO coefficient, high laser-induced damage thresholds (LDT), and environmental friendliness remains a major challenge. Herein, we have synthesized two chiral hybrid bismuth halides: (R/S-MBA)BiBr spiral structure microplates, templated by chiral (R/S)-methylbenzylamine (R/S-MBA). The as-grown chiral lead-free perovskite spiral microplates exhibit a recorded second harmonic generation (SHG) effect with a large effective second-order NLO coefficient () of 11.9 pm V and a high LDT of up to 59.2 mJ cm. More importantly, the twisted screw structures show competitive circular polarization sensitivity at 1200 nm with an anisotropy factor () of 0.58, which is about 3 times higher than that of reported Pb-based chiral perovskites. These findings provide a new platform to design multifunctional lead-free chiral perovskites for nonlinear photonic applications.
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| http://dx.doi.org/10.1021/acs.nanolett.2c04224 | DOI Listing |
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