Affiliation:
1. State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510641 China
2. College of Textiles Zhongyuan University of Technology Zhengzhou 450007 China
3. School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
4. Beijing Key Laboratory of Lignocellulosic Chemistry, State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry University Beijing 100083 China
Abstract
AbstractSmart‐response materials with ultralong room‐temperature phosphorescence (RTP) are highly desirable, but they have rarely been described, especially those originating from sustainable polymers. Herein, a variety of cellulose derivatives with 1,4‐dihydropyridine (DHP) rings are synthesized through the Hantzsch reaction, giving impressive RTP with a long lifetime of up to 1251 ms. Specifically, the introduction of acetoacetyl groups and DHP rings promotes the spin‐orbit coupling and intersystem crossing process; and multiple interactions between cellulose induce clustering and inhibit the nonradiative transitions, boosting long‐live RTP. Furthermore, the resulting transparent and flexible cellulose films also exhibit excitation‐dependent and color‐tunable afterglows by introducing different extended aromatic groups. More interestingly, the RTP performance of these films is sensitive to water and can be repeated in response to wet/dry stimuli. Inspired by these advantages, the RTP cellulose demonstrates advanced applications in information encryption and anti‐counterfeiting. This work not only enriches the photophysical properties of cellulose but also provides a versatile platform for the development of sustainable afterglows.
Funder
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
3 articles.
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