Zhao Di, Li Xianglong, Li Qianrui, Yue Chunmei, Wang Yige, Li Huanrong
School of Chemical Engineering and Technology, Hebei University of Technology GuangRong Dao 8, Hongqiao District Tianjin 300130 P. R. China
Chem Sci. 2024 Jul 19;15(33):13306-13312. doi: 10.1039/d4sc02733g. eCollection 2024 Aug 22.
Photo-responsive luminescent materials capable of responding to light stimuli are crucial in the realm of sophisticated encryption, anti-counterfeiting, and optical data storage. Yet, the development of such materials that also feature self-healing capabilities, swift reaction times, light weight, fatigue resistance, dynamic display abilities, and enhanced security measures is exceedingly rare and presents considerable challenges. Herein, a novel family of self-healing and photo-stimuli-responsive photoluminescent polymers are reported, which is achieved by interlinking terpyridine- and spiropyran-functionalized polymers through N-Ln coordination bonds and hydrogen bonding among the polymer chains. The resulting polymers exhibit good processability, superior tensile strength, fast self-healing ability, and photo-stimuli-responsive performance. The photo-stimuli-responsive properties include unique color shifts (colorless and purple) and light-controlled time-dependent fluorescence modulation (green-, red-, and yellow-emission), which stem from fine-tuning the isomerization of spiropyran and leveraging the fluorescence resonance energy transfer (FRET) from Ln-Tpy donors to spiropyran acceptors, respectively. Besides, these polymers have been successfully applied in dynamic multi-level information encryption applications. We are convinced that these smart materials, crafted through our innovative approach, hold vast potential for applications in information storage, cutting-edge anti-counterfeiting encryption, UV-sensing, and light-writing technologies, marking a novel strategy in the design of photosensitive luminescent smart materials.
能够对光刺激做出响应的光响应发光材料在复杂加密、防伪和光学数据存储领域至关重要。然而，同时具备自愈能力、快速反应时间、轻质、抗疲劳、动态显示能力和增强安全措施的此类材料的开发极为罕见，且面临巨大挑战。在此，我们报道了一类新型的自愈且光刺激响应的光致发光聚合物，它是通过吡啶三联体和螺吡喃功能化聚合物通过N-Ln配位键以及聚合物链间的氢键相互连接而实现的。所得聚合物表现出良好的加工性能、优异的拉伸强度、快速的自愈能力和光刺激响应性能。光刺激响应特性包括独特的颜色变化（无色和紫色）以及光控的时间依赖性荧光调制（绿色、红色和黄色发射），这分别源于对螺吡喃异构化的精细调节以及利用从Ln-Tpy供体到螺吡喃受体的荧光共振能量转移（FRET）。此外，这些聚合物已成功应用于动态多级信息加密应用。我们坚信，通过我们的创新方法制备的这些智能材料在信息存储、前沿防伪加密、紫外线传感和光写入技术等应用中具有巨大潜力，这标志着在光敏发光智能材料设计方面的一种新策略。
