Excitation‐Dependent Long‐Life Luminescent Polymeric Systems under Ambient Conditions. Issue 25 (4th November 2019)

• Record Type: Journal Article
• Authors: Su, Yan; Zhang, Yongfeng; Wang, Zhonghao; Gao, Weichen; Jia, Peng; Zhang, Dan; Yang, Chaolong; Li, Youbing; Zhao, Yanli
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 25(2020)
• Page Start: 9967
• Page End: 9971
• Publication Date: 2019-11-04
• Subjects: aggregation-induced emission -- anti-counterfeiting -- doped polymer films -- long-life luminescence -- self-assembly; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201912102
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Organic room temperature luminescent materials present a unique phosphorescence emission with a long lifetime. However, many of these materials only emit single blue or green color in spite of external stimulation, and their color tunability is limited. Herein, we report a rational design to extend the emission color range from blue to red by controlling the doping of simple pyrene derivatives into a robust polymer matrix. The integration of these pyrene molecules into the polymer films enhances the intersystem crossing pathway, decreases the first triplet level of the system, and ensures the films show a sensitive response to excitation energy, finally yielding excitation‐dependent long‐life luminescent polymeric systems under ambient conditions. These materials were used to construct anti‐counterfeiting patterns with multicolor interconversion, presenting a promising application potential in the field of information security. Abstract : Lucky blue‐red clovers : A strategy for achieving excitation‐dependent long‐life luminescent polymer systems under ambient conditions by tuning the aggregation state of phosphors in polyvinyl alcohol films is developed. The developed polymers show promise in multicolor patterning for anti‐counterfeiting applications.