Uncovering the Intramolecular Emission and Tuning the Nonlinear Optical Properties of Organic Materials by Cocrystallization

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• 作者：Dr. Weigang Zhu ; Dr. Lingyun Zhu ; Lingjie Sun ; Dr. Yonggang Zhen ; Dr. Huanli Dong ; Prof. Zhixiang Wei and Prof. Wenping Hu
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：November 2, 2016
• 年：2016
• 卷：55
• 期：45
• 页码：14023-14027
• 全文大小：3651K
• ISSN：1521-3773

文摘

The spectroscopic and photophysical properties of organic materials in the solid-state are widely accepted as a result of their molecular packing structure and intermolecular interactions, such as J- and H-aggregation, charge-transfer (CT), excimer and exciplex. However, in this work, we show that Spe-F₄DIB cocrystals (SFCs) surprisingly retain the energy levels of photoluminescence (PL) states of Spe crystals, despite a significantly altered molecular packing structure after cocrystallization. In comparison, Npe-F₄DIB cocrystals (NFCs) with new spectroscopic states display different spectra and photophysical behaviors as compared with those of individual component crystals. These may be related to the molecular configuration in crystals, and we propose Spe as an “intramolecular emissive” material, thus providing a new viewpoint on light-emitting species of organic chromophores. Moreover, the nonlinear optical (NLO) properties of Npe and Spe are firstly demonstrated and modulated by cocrystallization. The established “molecule-packing-property” relationship helps to rationally control the optical properties of organic materials through cocrystallization.