The design of excellent circularly polarized luminescence (CPL) materials with a large luminescence dissymmetry factor (g_lum) remains a great challenge. In this paper, we chose two achiral conjugated pyrene-based main-chain polymers (BP-1 and BP-2) with different substitution positions (1,6-positions of the pyrene rings for BP-1 and 2,7-positions of the pyrene rings for BP-2) and a chiral binaphthyl-based inducer (S/R-D) with a bridged alkyl chain to construct chiral coassemblies through an intermolecular chirality induction mechanism. Interestingly, after the thermal annealing treatment, the resulting coassemblies S/R-D-BP-2 could emit inverted and amplified CPL signals compared with S/R-D-BP-1. Most significantly, the maximum |g_lum| value of (S/R-D)_0.2-(BP-2)_0.8 in a spin-coated film was up to 0.71 (λ_em = 428 nm, QY = 44.8%) at a 220 nm thickness, which was about 6-fold that of (S/R-D)_0.1-(BP-1)_0.9 (|g_lum| = 0.12, λ_em = 451 nm, QY = 37.6%). The excellent g_lum value of (S/R-D)_0.2-(BP-2)_0.8 was due to the formation of regular and ordered helical nanofibers through the strong intermolecular π–π stacking interactions. This work provides a creative approach to tune the CPL emission amplification behaviors by chiral coassembly from achiral pyrene-based main-chain polymers.

中文翻译：

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手性共组装体中非手性芘基聚合物的结构-活性调控引起的反向放大圆偏振发光行为

设计具有大发光不对称因子（g _lum）的优异圆偏振发光（CPL）材料仍然是一个巨大的挑战。在本文中，我们选择了两种非手性共轭芘基主链聚合物（BP-1和BP-2 ），它们具有不同的取代位置（ BP-1的芘环的1,6位和BP-1的芘环的2,7位）BP-2的芘环）和具有桥接烷基链的手性联萘基诱导剂（S / R -D），通过分子间手性诱导机制构建手性共组装体。有趣的是，在热退火处理后，与S / R -D -BP-1相比，所得的组合体S / R -D-BP-2可以发射反向且放大的CPL信号。最重要的是，最大 |克伦|_{​旋涂薄膜中(} S / R -D) _0.2 -(BP-2) _0.8的值在220 nm厚度时高达0.71 (λ _em = 428 nm, QY = 44.8%)，约为6-折叠 ( S / R -D) _0.1 -(BP-1) _0.9 (| g _lum | = 0.12, λ _em = 451 nm, QY = 37.6%)。( S / R -D) _0.2 -(BP-2) _0.8优异的glum_值是由于通过强烈的分子间π-π堆积相互作用形成规则且有序的螺旋纳米纤维。这项工作提供了一种创造性的方法，通过非手性芘基主链聚合物的手性共组装来调节 CPL 发射放大行为。