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Mechano-induced persistent room-temperature phosphorescence from purely organic molecules†
Chemical Science ( IF 8.4 ) Pub Date : 2018-03-19 00:00:00 , DOI: 10.1039/c8sc00429c
Yingxiao Mu 1 , Zhiyong Yang 1 , Junru Chen 1 , Zhan Yang 1 , Wenlang Li 1 , Xianbao Tan 1 , Zhu Mao 1 , Tao Yu 1 , Juan Zhao 1 , Shizhao Zheng 1 , Siwei Liu 1 , Yi Zhang 1 , Zhenguo Chi 1 , Jiarui Xu 1 , Matthew P Aldred 2
Affiliation  

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.

中文翻译:

纯有机分子机械诱导的持久室温磷光†

固态纯有机材料的持久室温磷光(RTP)最近引起了人们的广泛研究兴趣,并且在去除激发源后通过肉眼发现了有前途的、快速的和视觉的应用。然而,几乎所有报道的有机持久 RTP 过程都是通过使用紫外光照射源诱导的。在该报告中,提出了发射寿命长达0.15秒的持久RTP,它不仅可以通过光照射诱导,还可以通过机械作用诱导,它将机械诱导发光和持久RTP融合在一起。研究发现,这种持久的RTP是通过具有不同激发态构型的单元的分子间电子耦合(IEC)产生的。有趣的是,有两种不同的晶体具有和不具有机械诱导的持久RTP,可以从这种有机材料中生长出来,因为这种新型机械发光(ML)强烈依赖于它们的分子间相互作用。此外,这种机械诱导的持久RTP的强度也可以通过降低温度来增加,类似于光诱导的持久RTP。值得注意的是,随着温度的降低,这两种晶体分别表现出 ML 增强和 ML“开启”。因此,这种机械诱导的持久RTP提供了新型有机发光材料的一个例子,它是有机发光中缺失的一块拼图,对于有机材料持久RTP和ML的基础研究和实际应用都很重要。
更新日期:2018-03-19
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