Efficient pure organic room temperature phosphorescence (RTP) materials have drawn considerable attention. So far, most pure organic RTP molecules are aromatic compounds, and nonconjugated molecules are really scarce. The only few reported non-aromatic organic phosphorescence materials are polymers without confirmed subtle structures, and there are no reports concerning non-aromatic organic small molecules with persistent RTP. Here, we report an example of a pure non-aromatic organic small molecule, cyanoacetic acid, that shows unexpected persistent RTP behavior with RTP lifetime as long as 862 ms. According to the CAA crystal and theoretical calculations, the presence of strong intermolecular hydrogen bonds is the key factor for its persistent RTP effect. This discovery demonstrates a clear relationship between the molecular structure, packing mode and RTP effect in the non-aromatic system, which will largely extend the current pure organic RTP systems to deeply investigate the origin of light emission.

中文翻译：

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非芳香族低分子量纯有机分子通过分子间氢键产生意外的室温磷光†

高效的纯有机室温磷光（RTP）材料引起了相当大的关注。到目前为止，大多数纯有机RTP分子是芳族化合物，非共轭分子确实很稀少。报道的仅有少数几种非芳香族有机磷光材料是没有证实微妙结构的聚合物，也没有关于具有持久性RTP的非芳香族有机小分子的报道。在这里，我们报告一个纯的非芳香族有机小分子氰基乙酸的例子，该例子显示了RTP寿命长达862 ms的意外的持久性RTP行为。根据CAA晶体和理论计算，强分子间氢键的存在是其持久RTP效应的关键因素。这一发现证明了分子结构之间的明确关系，