Aggregation-Induced Dual Emission and Unusual Luminescence beyond Excimer Emission of Poly(ethylene terephthalate),Macromolecules

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Aggregation-Induced Dual Emission and Unusual Luminescence beyond Excimer Emission of Poly(ethylene terephthalate)
Macromolecules ( IF 5.1 ) Pub Date : 2018-11-01 00:00:00 , DOI: 10.1021/acs.macromol.8b01743
Xiaohong Chen ₁ , Zihan He ₁ , Fahmeeda Kausar ₁ , Gan Chen ₁ , Yongming Zhang ₁ , Wang Zhang Yuan ₁

Affiliation

Pure organic luminogens with fluorescence–room temperature phosphorescence (RTP) dual emission have significant fundamental importance and promising applications. So far, most dual emissive materials, however, are molecular compounds; polymers still remain rare. Herein, we revisited the emission of poly(ethylene terephthalate) (PET), which is weakly luminescent in dilute solutions but becomes highly emissive in concentrated solutions and solids, demonstrating concentration-enhanced and aggregation-induced emission (AIE) characteristics. Furthermore, the efficiency of the films is enhanced with increasing crystallinity, accompanying the presence of RTP. Such crystallization-enhanced dual emission is understandable taking account of conformation rigidification. Moreover, despite there is merely a single phenyl ring, emission maxima at around 400, 450, and 480 nm are observed in concentrated solutions and highly crystalline films, which cannot be simply ascribed to RTP but can well be rationalized by the clustering-triggered emission (CTE) mechanism. Namely, the clustering of terephthalate units results in efficient through-space electronic communications, thus generating extended delocalization beyond those of dimers. This study not only unveils new features of the PET emission, which may enlighten emerging applications, but also provide new insights into the construction of novel luminogens free of polycyclic aromatic hydrocarbons.

中文翻译：

聚对苯二甲酸乙二醇酯的准分子发射引起聚集诱导的双重发射和异常发光

具有荧光-室温磷光（RTP）双发射的纯有机发光剂具有重要的基础重要性和广阔的应用前景。到目前为止，大多数双重发射材料都是分子化合物。聚合物仍然很少见。在这里，我们重新审视了聚对苯二甲酸乙二醇酯（PET）的发射，该聚对苯二甲酸乙二醇酯在稀溶液中微弱地发光，而在浓溶液和固体中变得高度发射，这证明了浓度增强和聚集诱导发射（AIE）的特性。此外，伴随RTP的存在，膜的效率随着结晶度的增加而提高。考虑到构象刚性，这种结晶增强的双发射是可以理解的。此外，尽管只有一个苯环，但最大发射量约为400，在浓缩溶液和高度结晶的薄膜中观察到450和480 nm，这不能简单地归因于RTP，而是可以通过簇触发发射（CTE）机理使其合理化。即，对苯二甲酸酯单元的聚集导致有效的全空间电子通信，从而产生扩展的除二聚体之外的离域化。这项研究不仅揭示了PET排放的新特征，可以启发新兴应用，而且为构建不含多环芳烃的新型发光剂提供了新的见识。对苯二甲酸酯单元的聚集导致有效的全空间电子通信，从而产生扩展的除二聚体以外的离域化作用。这项研究不仅揭示了PET排放的新特征，可以启发新兴应用，而且为构建不含多环芳烃的新型发光剂提供了新的见识。对苯二甲酸酯单元的聚集导致有效的全空间电子通信，从而产生扩展的除二聚体以外的离域化作用。这项研究不仅揭示了PET排放的新特征，可以启发新兴应用，而且为构建不含多环芳烃的新型发光剂提供了新的见识。

更新日期：2018-11-01

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