Guo Yalong, Zhu Wei, Tao Meng, Wu Xinlei, Chen Jinke, Peng Xiaoluo, Zheng Sijia, Zhao Zujin, Cao Zhihai
Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing & Finishing, Zhejiang Sci-Tech University, Hangzhou 310018, China.
State Key Laboratory of Luminescent Materials and Devices, Guangdong Province Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China.
ACS Appl Mater Interfaces. 2022 Aug 31;14(34):39384-39395. doi: 10.1021/acsami.2c11279. Epub 2022 Aug 16.
Fluorescent polymer nanomaterials with dynamic fluorescence properties hold great potential in many advanced applications, including but not limited to information encryption, adaptive camouflage, and biosensors. The key to improving the application value of materials is to establish an accurate control strategy for dynamic fluorescence behavior. Herein, we develop a core-shell engineering strategy to precisely and independently manipulate the dynamic fluorescence behavior through the shell polymeric matrix. The core-shell fluorescent polymer nanoparticles (CS-FPNPs) are constructed through a sequential process of miniemulsion polymerization and seeded emulsion polymerization. Taking advantage of the core-shell structure, the rigid core matrix ensures the strong initial emission of AIE units, while the photoisomerization behavior of spiropyrane (SP) units is delicately and independently regulated by the rigidness of the shell matrix. Thereby, CS-FPNPs exhibit bright time-dependent reversible dynamic fluorescence behavior under alternating UV/vis irradiation. Benefited from the excellent processability and film formation ability, we have successfully applied CS-FPNPs to dynamic decorative painting, warning labels, and dynamic QR code security. Impressively, the fluorescence manipulation strategy based on core-shell engineering allows the independent regulation of specific luminescent units in complicated emission systems to accurately embody designed emission behavior.
具有动态荧光特性的荧光聚合物纳米材料在许多先进应用中具有巨大潜力，包括但不限于信息加密、自适应伪装和生物传感器。提高材料应用价值的关键在于建立精确的动态荧光行为控制策略。在此，我们开发了一种核壳工程策略，通过壳层聚合物基质精确且独立地操纵动态荧光行为。核壳荧光聚合物纳米粒子（CS-FPNPs）通过微乳液聚合和种子乳液聚合的顺序过程构建而成。利用核壳结构，刚性核基质确保了聚集诱导发光（AIE）单元的强初始发射，而螺吡喃（SP）单元的光异构化行为则由壳基质的刚性精细且独立地调节。因此，CS-FPNPs在交替的紫外/可见光照射下表现出明亮的时间依赖性可逆动态荧光行为。受益于优异的加工性能和成膜能力，我们已成功将CS-FPNPs应用于动态装饰涂料、警示标签和动态二维码安全领域。令人印象深刻的是，基于核壳工程的荧光操纵策略允许在复杂发射系统中独立调节特定发光单元，以准确体现设计的发射行为。
