Circularly polarized luminescent (CPL) materials show great potential applications in asymmetric synthesis, chemical sensors, biological probes, 3D displays and other fields. However, the preparation of high efficiency circularly polarized luminescent materials with a high solid fluorescence quantum yield and a large g_lum value is still a challenge. This article creatively combines the construction strategy of CPL materials and side-chain chiral liquid crystal polymer materials to engineer a series of new CPL-active side-chain chiral liquid crystal polymers (named PGAC-m, m is the spacer length, m = 4, 6, 10). The chiral poly(L-glutamate) with an α-helical secondary structure is devised as the backbone, and the cyanostilbene with aggregation-induced emission enhancement (AIEE) characteristics is applied as luminescent mesogen pendants, which is covalently linked to the backbone by different spacer lengths. The phase structure and the photophysical properties of PGAC-m were characterized in detail. The experimental results show that PGAC-m can self-assemble to form a lamellar-ordered chiral smectic C (SmC*) phase structure and show typical AIEE characteristics with high solid-state quantum yield. The chirality of polypeptides can be transferred to cyanostilbene, which makes PGAC-m emit circularly polarized light. Meanwhile, the chiral helix structure of PGAC-m can effectively enlarge the g_lum value, and therefore PGAC-m shows high solid quantum yield and a large g_lum value. Interestingly, the photophysical properties of PGAC-m can be regulated by changing the spacer length. The solid fluorescence quantum yield of PGAC-m decreases gradually with the increase of spacer length, while the g_lum value shows the opposite trend. The maximum solid fluorescence quantum yield and the g_lum value of PGAC-m can be 34.1% and 4.5 × 10⁻², respectively.

中文翻译：

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高效圆偏振发光液晶多肽的制备及性能控制

圆偏振发光（CPL）材料在不对称合成，化学传感器，生物探针，3D显示器和其他领域中显示出巨大的潜在应用。然而，制备具有高固体荧光量子产率和大g _lum值的高效圆偏振发光材料仍然是一个挑战。本文创造性地结合了CPL材料和侧链手性液晶聚合物材料的构建策略，以设计出一系列新型的CPL活性侧链手性液晶聚合物（命名为PGAC- m，m为间隔物长度，m = 4 ，6、10）。手性聚（L（α-谷氨酸）被设计为骨架，而具有聚集诱导发射增强（AIEE）特征的氰基二苯乙烯被用作发光液晶元悬垂物，其通过不同的间隔物长度共价连接到骨架。详细描述了PGAC- m的相结构和光物理性质。实验结果表明，PGAC - m可以自组装形成层状有序的手性近晶C（SmC *）相结构，并显示出典型的AIEE特性，并具有较高的固态量子产率。多肽的手性可转移至氰基二苯乙烯，从而使PGAC- m发射圆偏振光。同时，PGAC- m的手性螺旋结构能够有效地扩大克_LUM值，因此PGAC-米显示出高的固体量子产率和大的克_LUM值。有趣的是，PGAC- m的光物理性质可以通过改变间隔子的长度来调节。PGAC- m的固体荧光量子产率随着间隔长度的增加而逐渐降低，而g _lum值却呈现相反的趋势。PGAC- m的最大固体荧光量子产率和g _lum值可以分别为34.1％和4.5×10 ^-2。