Affiliation:
1. Key Laboratory of Polymeric Materials and Application Technology of Hunan Province Key Laboratory of Advanced Organic Functional Materials of Colleges and Universities of Hunan Province College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
2. Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province School of Science Instrumentation and Service Center for Molecular Sciences Westlake University 18 Shilongshan Road Hangzhou Zhejiang 310024 China
3. Key School of Chemistry and Materials Engineering Huizhou University Huizhou Guangdong 516007 China
Abstract
AbstractLong lifetime delayed fluorescent materials have great potential applications in bioimaging, anti‐counterfeiting encryption, lighting, and other fields. However, the preparation of functionalized long lifetime fluorescent materials with simple chemical structure and tunable luminescent behavior still poses significant challenges. In this article, a simple and effective method to prepare a series of long lifetime delayed fluorescent copolymers with temperature and humidity tolerance is presented. This method involves the copolymerization of 2‐bromo‐5‐hydroxybenzaldehyde derivative monomer (M1), which contains electron‐withdrawing groups, with naphthalimide derivative fluorescent monomer (M2), which contains electron‐donating groups. The results demonstrate that long‐range charge transfer occurs between the two components in copolymers, forming charge‐separated states that emit long lifetime delayed fluorescence after exciton recombination. The delayed luminescent behavior of the copolymer is directly influenced by the content of the M2 component. The maximum delayed fluorescence lifetime can reach 13.7 ms, and the fluorescence quantum yield is 39%. Interestingly, the polymer film of P3 can emit a maximum afterglow of 1.00 s after photoactivation. Even after being immersed in water for 49 days, the afterglow remains unchanged. Besides, the afterglow of P3 can exist for ≈0.43 s at 323 K. Even at 373 K, the afterglow for 0.2 s can still be observed.
Funder
National Natural Science Foundation of China
Hunan Provincial Innovation Foundation for Postgraduate
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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