Huang Sha, Wen Yahan, Wang Xincan, Cheng Yuan, Yuan Yongjie, Zhang Hailiang
Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Organic Functional Materials of Colleges and Universities of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, China.
Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Instrumentation and Service Center for Molecular Sciences, Westlake University, 18 Shilongshan Road, Hangzhou, Zhejiang 310024, China.
ACS Appl Mater Interfaces. 2024 Feb 21;16(7):9323-9332. doi: 10.1021/acsami.3c18617. Epub 2024 Feb 9.
Chiral luminescent liquid crystals have attracted widespread attention from researchers due to their unique advantages in constructing circularly polarized luminescent (CPL) materials with large luminescent asymmetry factor () values. However, how to effectively prepare nondoped CPL chiral liquid crystals remains a challenge. In this article, we developed an effective and universal method to prepare nondoped CPL chiral liquid crystal materials. To achieve our strategy, we copolymerized chiral monomer M0Mt with α-cyanostilbene-based luminescent monomers MPVPCN ( = 6, 8, 10) bearing different flexible spacer lengths to obtain a series of CPL chiral liquid crystal copolymers poly(MmPVPCN()--M0Mt()). Under the induction of the chiral component, the α-cyanostilbene component assembles to form chiral liquid crystals. Meanwhile, α-cyanostilbene also exhibits aggregation-induced emission enhancement characteristics. Therefore, with the help of the selective reflection effect of chiral liquid crystals, the copolymer films can emit efficient CPL. For poly(M8PVPCN(0.85)--M0Mt(0.15)), the and solid luminescence quantum yield can achieve -2.61 × 10 and 25.04%, respectively. In addition, by altering the chemical structure of the copolymers, the phase structure of the copolymers can be effectively controlled, thereby regulating their CPL properties.
手性发光液晶因其在构建具有大发光不对称因子（ ）值的圆偏振发光（CPL）材料方面的独特优势而受到研究人员的广泛关注。然而，如何有效地制备非掺杂CPL手性液晶仍然是一个挑战。在本文中，我们开发了一种有效且通用的方法来制备非掺杂CPL手性液晶材料。为了实现我们的策略，我们将手性单体M0Mt与具有不同柔性间隔长度的α-氰基芪基发光单体MPVPCN（ = 6、8、10）共聚，以获得一系列CPL手性液晶共聚物聚（MmPVPCN（ ）--M0Mt（ ））。在手性组分的诱导下，α-氰基芪组分组装形成手性液晶。同时，α-氰基芪还表现出聚集诱导发光增强特性。因此，借助手性液晶的选择性反射效应，共聚物薄膜可以发射高效的CPL。对于聚（M8PVPCN（0.85）--M0Mt（0.15））， 和固体发光量子产率分别可以达到-2.61×10和25.04%。此外，通过改变共聚物的化学结构，可以有效地控制共聚物的相结构，从而调节它们的CPL性质。
