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首页> 外文期刊>Advanced Functional Materials >Pure Organic Room Temperature Phosphorescence from Unique Micelle-Assisted Assembly of Nanocrystals in Water
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Pure Organic Room Temperature Phosphorescence from Unique Micelle-Assisted Assembly of Nanocrystals in Water

机译：独特的胶束辅助的水中纳米晶体组装产生纯有机室温磷光

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Pure organic room temperature phosphorescence (RTP) is highly preferable because of its long lifetime and potential applications. However, these kinds of materials are still very scarce due to the weak spin-orbit coupling between singlet and triplet states and easily nonradiative decay of the excited states. Achieving room temperature phosphorescence under visible light excitation is particularly challenging in aqueous solution. Herein, a micelle-assisted assembling strategy has been developed to realize pure organic RTP in water by using donor-acceptor molecules. A visible-light responsive long-lived RTP in water with a lifetime more than 3 ms is obtained by the prepared nanocrystals. However, the same molecules show no RTP as rigid bulk crystals. Spectroscopic studies, single-crystal structure analysis, X-ray diffraction patterns, and density functional theory calculations reveal that the intermolecular interactions, heavy atom effect, and the molecular packing way play critical role to the long-lived RTP character for the assembled nanocrystals in water and thermally activated delayed fluorescence for crystals in solid.
机译：纯有机室温磷光（RTP）由于使用寿命长和潜在的应用而受到高度青睐。但是，由于单重态和三重态之间的弱自旋轨道耦合以及受激态容易发生非辐射衰减，因此这类材料仍然非常稀缺。在水溶液中实现在可见光激发下的室温磷光是特别具有挑战性的。在本文中，已经开发了一种胶束辅助的组装策略，以通过使用供体-受体分子在水中实现纯有机RTP。通过制备的纳米晶体，获得了具有大于3ms的寿命的水中的可见光响应的长寿命RTP。但是，相同的分子没有显示出像刚性块状晶体那样的RTP。光谱研究，单晶结构分析，X射线衍射图和密度泛函理论计算表明，分子间的相互作用，重原子效应和分子堆积方式对组装的纳米晶体的长寿命RTP特性起关键作用。水和热活化延迟的荧光，可用于固体晶体。

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