Highly Anisotropic Second-Order Nonlinear Optical Effects in the Chiral Lead-Free Perovskite Spiral Microplates.
basic_science · Level V
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- Record sourced from PubMed, PMID 36622365.
- Also identified by DOI 10.1021/acs.nanolett.2c04224.
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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)<sub>4</sub>Bi<sub>2</sub>Br<sub>10</sub> 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 (<i>d</i><sub>eff</sub>) of 11.9 pm V<sup>-1</sup> and a high LDT of up to 59.2 mJ cm<sup>-2</sup>. More importantly, the twisted screw structures show competitive circular polarization sensitivity at 1200 nm with an anisotropy factor (<i>g</i><sub>SHG-CD</sub>) 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.