Zhang Haowen, Han Jianlei, Jin Xue, Duan Pengfei
College of Chemistry, Zhengzhou University, No.100 Science Avenue, Zhengzhou, 450001, P. R. China.
CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), ZhongGuanCun BeiYiTiao, Beijing, 100190, P. R. China.
Angew Chem Int Ed Engl. 2021 Feb 23;60(9):4575-4580. doi: 10.1002/anie.202014891. Epub 2021 Jan 7.
A major trade-off in the field of circularly polarized luminescence (CPL) of pure organic materials is that the large luminescence dissymmetry factor (g ) usually gives rise to the suppression of luminescence efficiency (Φ ). Here, a supramolecular self-assembled system, driven by arene-perfluoroarene (AP) interactions of chiral polycyclic aromatic hydrocarbons (PAHs) and octafluoronaphthalene (OFN), is reported to provide a solution to this problem. Two kinds of chiral PAHs based on pyrene and anthracene could co-assemble with OFN in hybrid solvents to form long-range-ordered AP assemblies. The detailed process of AP interaction driving self-assembly was verified by morphological measurements and fluorescence spectra. The AP assemblies exhibited chirality amplification not only in the excited state but also in the ground state. In addition, the AP assemblies showed an enhanced luminescence efficiency compared with the individual chiral PAHs due to the energy-barrier effect of OFN. The present strategy based on AP interactions could be applied to boost the development of highly efficient CPL-active materials.
纯有机材料圆偏振发光（CPL）领域的一个主要权衡是，大的发光不对称因子（g）通常会导致发光效率（Φ）的降低。在此，据报道一种由手性多环芳烃（PAHs）与八氟萘（OFN）的芳烃 - 全氟芳烃（AP）相互作用驱动的超分子自组装体系为解决这一问题提供了一种方案。两种基于芘和蒽的手性PAHs可在混合溶剂中与OFN共同组装形成长程有序的AP组装体。通过形态测量和荧光光谱验证了AP相互作用驱动自组装的详细过程。AP组装体不仅在激发态而且在基态都表现出手性放大。此外，由于OFN的能垒效应，与单个手性PAHs相比，AP组装体表现出增强的发光效率。基于AP相互作用的当前策略可应用于推动高效CPL活性材料的发展。
