National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering, Changzhou University, Changzhou, 213164, P. R. China.
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), No. 11 ZhongGuanCun BeiYiTiao, Beijing 100190, P. R. China.
Nanoscale. 2023 Jun 30;15(25):10820-10825. doi: 10.1039/d3nr01515g.
We constructed chiral supramolecular nanofibers for light harvesting based on symmetry-breaking, and these can generate near-infrared circularly polarized luminescence (CPL) with high dissymmetry factor () through a synergistic energy transfer and chirality transfer process. Firstly, the achiral molecule BTABA was assembled into a symmetry-breaking assembly using a seeded vortex strategy. Subsequently, the chiral assembly can endow the two achiral acceptors, Nile Red (NR) and Cyanine 7 (CY7), with supramolecular chirality, as well as chiroptical properties. CY7 can reach an excited state and emit near-infrared light through a cascade energy transfer process from BTABA to NR and then to CY7, but cannot directly acquire energy from the excited BTABA. Significantly, the near-infrared CPL of CY7 can be obtained with a boosted value of 0.03. This work will provide a deep insight into the preparation of materials with near-infrared CPL activity from an exclusively achiral system.
我们构建了基于对称性破缺的手性超分子纳米纤维用于光捕获，通过协同能量转移和手性转移过程，这些纤维可以产生具有高不对称因子 () 的近红外圆偏振发光 (CPL)。首先，非手性分子 BTABA 被组装成具有成核涡旋策略的对称破缺组装体。随后，手性组装体可以赋予两个非手性受体，尼罗红 (NR) 和花菁 7 (CY7)，超分子手性以及手性光学性质。CY7 可以通过从 BTABA 到 NR 然后到 CY7 的级联能量转移过程达到激发态并发射近红外光，但不能直接从激发的 BTABA 中获取能量。重要的是，CY7 的近红外 CPL 可以获得增强的 值为 0.03。这项工作将深入了解从纯非手性体系制备具有近红外 CPL 活性的材料。
