Jie Yang1, Xu Zhen2, Bin Wang3, Xuming Gao1, Zichun Ren1, Jiaqiang Wang1, Yujun Xie1, Jianrong Li3, Qian Peng4, Kanyi Pu5, Zhen Li6. 1. Department of Chemistry, Wuhan University, Wuhan, 430072, China. 2. School of Chemical and Biomedical Engineering Nanyang Technological University, Singapore, 637457, Singapore. 3. Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing, 100124, China. 4. Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Science (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China. 5. School of Chemical and Biomedical Engineering Nanyang Technological University, Singapore, 637457, Singapore. kypu@ntu.edu.sg. 6. Department of Chemistry, Wuhan University, Wuhan, 430072, China. lizhen@whu.edu.cn.
Abstract
Organic luminogens with persistent room temperature phosphorescence (RTP) have attracted great attention for their wide applications in optoelectronic devices and bioimaging. However, these materials are still very scarce, partially due to the unclear mechanism and lack of designing guidelines. Herein we develop seven 10-phenyl-10H-phenothiazine-5,5-dioxide-based derivatives, reveal their different RTP properties and underlying mechanism, and exploit their potential imaging applications. Coupled with the preliminary theoretical calculations, it is found that strong π-π interactions in solid state can promote the persistent RTP. Particularly, CS-CF3 shows the unique photo-induced phosphorescence in response to the changes in molecular packing, further confirming the key influence of the molecular packing on the RTP property. Furthermore, CS-F with its long RTP lifetime could be utilized for real-time excitation-free phosphorescent imaging in living mice. Thus, our study paves the way for the development of persistent RTP materials, in both the practical applications and the inherent mechanism.
Organic luminogens with persistent room temperature phosphorescence (RTP) have attracted great attention for their wide applications in optoelectronic devices and bioimaging. However, these materials are still very scarce, partially due to the unclear mechanism and lack of designing guidelines. Herein we develop sevenn class="Chemical">10-phenyl-10H-phenothiazine-5,5-dioxide-based derivatives, reveal their different RTP properties and underlying mechanism, and exploit their potential imaging applications. Coupled with the preliminary theoretical calculations, it is found that strong π-π interactions in solid state can promote the persistent RTP. Particularly, CS-CF3 shows the unique photo-induced phosphorescence in response to the changes in molecular packing, further confirming the key influence of the molecular packing on the RTP property. Furthermore, CS-F with its long RTP lifetime could be utilized for real-time excitation-free phosphorescent imaging in living mice. Thus, our study paves the way for the development of persistent RTP materials, in both the practical applications and the inherent mechanism.
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