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Mechano-induced persistent room-temperature phosphorescence from purely organic molecules

Mu, Yingxiao; Yang, Zhiyong; Chen, Junru; Yang, Zhan; Li, Wenlang; Tan, Xianbao; Mao, Zhu; Yu, Tao; Zhao, Juan; Zheng, Shizhao; Liu, Siwei; Zhang, Yi; Chi, Zhenguo; Xu, Jiarui; Aldred, Matthew. P.

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Authors

Yingxiao Mu

Zhiyong Yang

Junru Chen

Zhan Yang

Wenlang Li

Xianbao Tan

Zhu Mao

Tao Yu

Juan Zhao

Shizhao Zheng

Siwei Liu

Yi Zhang

Zhenguo Chi

Jiarui Xu

Matthew. P. Aldred



Abstract

The persistent room-temperature phosphorescence (RTP) of purely organic materials in the solid state has recently attracted much research interest and found promising, rapid and visual applications by the naked eye, after the removal of the excitation source. However, almost all reported organic persistent RTP processes are induced by using a UV-light irradiation source. In this report, persistent RTP with an emission lifetime as long as 0.15 s which can be induced not only by photoirradiation but also by mechanical action is presented, which merges mechano-induced luminescence and persistent RTP together. It is found that such persistent RTP is produced through intermolecular electronic coupling (IEC) of units with different excited state configurations. Interestingly, there are two different crystals with and without mechano-induced persistent RTP which can be grown from this organic material, as such a new type of mechano-luminescence (ML) is strongly dependent on their intermolecular interactions. Furthermore, the intensity of such mechano-induced persistent RTP can be increased by lowing the temperature as well, similar to that of photo-induced persistent RTP. Notably, these two crystals exhibit a ML enhancement and ML “turn on”, respectively, with decreasing temperature. Therefore, such mechano-induced persistent RTP provides an example of new types of organic luminescent materials, which is a missing jigsaw piece of organic luminescence and important for both fundamental research and practical applications of both persistent RTP and ML of organic materials.

Citation

Mu, Y., Yang, Z., Chen, J., Yang, Z., Li, W., Tan, X., …Aldred, M. P. (2018). Mechano-induced persistent room-temperature phosphorescence from purely organic molecules. Chemical Science, 9(15), 3782-3787. https://doi.org/10.1039/c8sc00429c

Journal Article Type Article
Acceptance Date Mar 18, 2018
Online Publication Date Mar 19, 2018
Publication Date Apr 21, 2018
Deposit Date May 3, 2018
Publicly Available Date May 3, 2018
Journal Chemical Science
Print ISSN 2041-6520
Electronic ISSN 2041-6539
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 9
Issue 15
Pages 3782-3787
DOI https://doi.org/10.1039/c8sc00429c

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