The influence of the molecular packing on the room temperature phosphorescence of purely organic luminogens

Jie Yang, Xu Zhen, Bin Wang, Xuming Gao, Zichun Ren, Jiaqiang Wang, Yujun Xie, Jianrong Li, Qian Peng, Kanyi Pu () and Zhen Li ()
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Jie Yang: Wuhan University
Xu Zhen: School of Chemical and Biomedical Engineering Nanyang Technological University
Bin Wang: Beijing University of Technology
Xuming Gao: Wuhan University
Zichun Ren: Wuhan University
Jiaqiang Wang: Wuhan University
Yujun Xie: Wuhan University
Jianrong Li: Beijing University of Technology
Qian Peng: Chinese Academy of Sciences
Kanyi Pu: School of Chemical and Biomedical Engineering Nanyang Technological University
Zhen Li: Wuhan University

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-03236-6

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