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Issue 15, 2018
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Mechano-induced persistent room-temperature phosphorescence from purely organic molecules

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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.

Graphical abstract: Mechano-induced persistent room-temperature phosphorescence from purely organic molecules

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Publication details

The article was received on 26 Jan 2018, accepted on 18 Mar 2018 and first published on 19 Mar 2018


Article type: Edge Article
DOI: 10.1039/C8SC00429C
Citation: Chem. Sci., 2018,9, 3782-3787
  • Open access: Creative Commons BY license
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    Mechano-induced persistent room-temperature phosphorescence from purely organic molecules

    Y. Mu, Z. Yang, J. Chen, Z. Yang, W. Li, X. Tan, Z. Mao, T. Yu, J. Zhao, S. Zheng, S. Liu, Y. Zhang, Z. Chi, J. Xu and Matthew. P. Aldred, Chem. Sci., 2018, 9, 3782
    DOI: 10.1039/C8SC00429C

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