Lai Zheng, Lin Shuai, Shi Youzhi, Li Maoxin, Liu Guangyou, Tian Bingbing, Chen Yu, Zhou Xinxing
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Institute of Microscale Optoelectronics, Shenzhen University, 518060, Shenzhen, P. R. China.
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications, School of Physics and Electronics, Hunan Normal University, 410081, Changsha, P. R. China.
Nanophotonics. 2022 Aug 10;11(18):4245-4251. doi: 10.1515/nanoph-2022-0313. eCollection 2022 Sep.
Chiral perovskites have attracted considerable attention as excellent spin-emitting materials for applications in spintronics, quantum optics, and biological. Especially in drug development of biological, weak chirality molecules are frequently selected to reduce the side effects of toxics, and there is a common defect for accurately detecting the weak chirality with common methods at room temperature. In this study, formamidine lead bromide perovskite nanocrystals (FAPbBr NCs) were coated with chiral ligands, whose chirality was too weak to be observed in the visible region at room temperature. Thus, by characterizing the transverse shift of photonic spin Hall effect (SHE), the accurate discrimination of weak chirality in the visible region was achieved successfully. By measuring the shift value and light spot splitting of photonic SHE at the same concentration, NEA-coated FAPbBr NCs can effectively enhance the chirality of naphthalene ethylamine (NEA) ligands when under the mutually reinforcement of chiral molecular and inorganic parts. In addition, we furtherly clearly distinguished the tiny chiral distinction of NEA-coated FAPbBr NCs with different particle sizes, which revealed that the chirality decreases with the increase of particle size. These findings could provide effective solutions for the detection and application of weak chirality in hybrid perovskite nanocrystals in universal environment.
手性钙钛矿作为自旋发光材料在自旋电子学、量子光学和生物医学等领域具有潜在应用前景，因而受到广泛关注。特别是在生物医学药物研发中，弱手性分子常被用于降低有毒物质的副作用，然而，在室温下使用常规方法准确检测弱手性存在普遍缺陷。在本研究中，用手性配体包覆甲脒铅溴钙钛矿纳米晶体（FAPbBr NCs），其手性在室温下的可见光区域太弱而无法观察到。因此，通过表征光子自旋霍尔效应（SHE）的横向位移，成功实现了在可见光区域对弱手性的准确鉴别。通过在相同浓度下测量光子SHE的位移值和光斑分裂，在 chiral分子和无机部分的相互增强作用下，NEA包覆的FAPbBr NCs能有效增强萘乙胺（NEA）配体的手性。此外，我们进一步清晰地区分了不同粒径的NEA包覆FAPbBr NCs的微小手性差异，结果表明手性随粒径增大而降低。这些发现可为通用环境下混合钙钛矿纳米晶体中弱手性的检测和应用提供有效解决方案。
