Li Junfeng, Hou Chenxi, Huang Chao, Xu Shanqi, Peng Xuelei, Qi Qi, Lai Wen-Yong, Huang Wei
Key Laboratory for Organic Electronics and Information Displays, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
Research (Wash D C). 2020 Apr 22;2020:3839160. doi: 10.34133/2020/3839160. eCollection 2020.
Realizing a high luminescence dissymmetry factor ( ) is a paramount yet challenging issue in the research field of circularly polarized luminescence (CPL). Here, we reported a novel set of organic conjugated systems with twisted intramolecular charge transfer (TICT) characteristics based on conjugated -carborane-binaphthyl dyads composing of binaphthyl units as chiral electron donors and -carborane units as achiral electron acceptors, demonstrating intense CPL with large values. Interestingly, single-crystalline -1 exhibited a high-level brightness and a large factor as high as +0.13, whereas single-crystalline -2 processed a relatively low brightness with a decreased value to -0.04. The significant diversity of CPL-active properties was triggered by the selective introduction of -carborane units onto the binaphthyl units. Benefiting from the large magnetic dipole transition moments in TICT states, the CPL activity of TICT -carborane-based materials exhibited amplified circular polarization. This study provides an efficient molecular engineering strategy for the rational design and development of highly efficient CPL-active materials.
在圆偏振发光（CPL）研究领域，实现高发光不对称因子（ ）是一个至关重要但具有挑战性的问题。在此，我们报道了一组基于共轭 - 碳硼烷 - 联萘二元体系的新型有机共轭体系，该体系具有扭曲的分子内电荷转移（TICT）特性，由作为手性电子供体的联萘单元和作为非手性电子受体的 - 碳硼烷单元组成，展示出具有大 值的强烈CPL。有趣的是，单晶 -1表现出高水平的亮度和高达 +0.13的大 因子，而单晶 -2的亮度相对较低， 值降至 -0.04。CPL活性性质的显著差异是由在联萘单元上选择性引入 - 碳硼烷单元引发的。受益于TICT态中的大磁偶极跃迁矩，基于TICT - 碳硼烷的材料的CPL活性表现出放大的圆偏振。本研究为合理设计和开发高效CPL活性材料提供了一种有效的分子工程策略。
