Ru Yi, Zhang Baowei, Yong Xue, Sui Laizhi, Yu Jingkun, Song Haoqiang, Lu Siyu
Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450000, China.
State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Adv Mater. 2023 Feb;35(5):e2207265. doi: 10.1002/adma.202207265. Epub 2022 Dec 18.
Chiral carbon dots (Ch-CDs) trigger the full-color circularly polarized luminescence (CPL) of CsPbX nanocrystals (NCs). Ch-CDs-CsPbBr NCs are successfully synthesized via simple ligand-assisted coprecipitation of Ch-CDs and metal halides precursors at room temperature. Ch-CDs-CsPbBr retains emission characteristics of the CsPbBr with near-unity photoluminescence quantum yield, and meanwhile has special CPL, with a maximum luminescence dissymmetric factor (g ) of -3.1 × 10 , which is induced by Ch-CDs. This is the first report of chiral perovskite which is induced by other chiral nanomaterials. By anion exchange, CPL can cover almost the entire visible light band. Surprisingly, the chiral signal of Ch-CDs-CsPbBr NCs is in-versed under excitation state, which can be induced by the charge transfers between Ch-CDs and perovskite NCs. The combination of perovskites and Ch-CDs pave away for the design of new chiral perovskite on multifunctional applications.
手性碳点（Ch-CDs）触发了CsPbX纳米晶体（NCs）的全色圆偏振发光（CPL）。通过在室温下简单的配体辅助共沉淀Ch-CDs和金属卤化物前驱体，成功合成了Ch-CDs-CsPbBr NCs。Ch-CDs-CsPbBr保留了CsPbBr的发射特性，光致发光量子产率接近1，同时具有特殊的CPL，最大发光不对称因子（g）为-3.1×10，这是由Ch-CDs诱导产生的。这是首次关于由其他手性纳米材料诱导的手性钙钛矿的报道。通过阴离子交换，CPL可以覆盖几乎整个可见光波段。令人惊讶的是，Ch-CDs-CsPbBr NCs的手性信号在激发态下会反转，这可以由Ch-CDs和钙钛矿NCs之间的电荷转移诱导产生。钙钛矿和Ch-CDs的结合为多功能应用中的新型手性钙钛矿设计铺平了道路。
