Clusteroluminescence (CL) has recently drawn more attention due to its unique photophysical behaviors that differ from traditional conjugated luminogens. However, the design of red emission from such systems is still challenging due to the intrinsic drawbacks of non-conjugated luminogens and the preliminary mechanisms. In this work, we synthesized four-armed star poly(maleic anhydride-alt-vinyl acetate) (SPMV) copolymers with different chain lengths through a reversible addition–fragmentation chain transfer (RAFT) polymerization method. By adjusting the amount of the chain transfer agent added, the chain lengths of the star copolymers could be transformed from long to short, regulating their fluorescence emission from blue to red. The emission wavelengths of the star copolymers with the shortest chain lengths are significantly red-shifted and concentrated in the red-orange region. The introduction of a star structure can enhance the flexibility of copolymer chains, thus promoting strong interchain interactions and the formation of more chromophores. Concurrently, the prepared star copolymer could be employed as a coating, endowing the substrate with excellent light transmittance and fluorescence properties. This study not only offers new insights into the CL mechanism but also presents a novel method to adjust the emission of anhydride copolymers, thereby expanding the applications of CLgens to unexplored fields.

中文翻译：

---

具有可调簇发光的星形共聚物


簇发光 （CL） 由于其不同于传统共轭发光体的独特光物理行为，最近引起了更多关注。然而，由于非共轭发光体的固有缺点和初步机制，这种系统的红光发射设计仍然具有挑战性。在这项工作中，我们通过可逆加成-碎裂链转移 （RAFT） 聚合方法合成了具有不同链长的四臂星形聚（马来酸酐-alt-醋酸乙烯酯）（SPMV） 共聚物。通过调整链转移剂的添加量，星形共聚物的链长可以由长变为短，调节其荧光发射由蓝色变为红色。具有最短链长的星形共聚物的发射波长明显红移并集中在红橙色区域。星形结构的引入可以增强共聚物链的柔韧性，从而促进强链间相互作用和更多发色团的形成。同时，制备的星形共聚物可以用作涂层，赋予基材优异的透光率和荧光性能。本研究不仅为阴酐机理提供了新的见解，还提出了一种调节酸酐共聚物排放的新方法，从而将 CLgens 的应用扩展到尚未开发的领域。