Two-Dimensional Organic Single Crystals with Scale Regulated, Phase-Switchable, Polymorphism-Dependent, and Amplified Spontaneous Emission Properties

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• 作者：Zhenyu Zhang ; Xiaoxian Song ; Shipan Wang ; Feng Li ; Hongyu Zhang ; Kaiqi Ye ; Yue Wang
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：May 5, 2016
• 年：2016
• 卷：7
• 期：9
• 页码：1697-1702
• 全文大小：409K
• 年卷期：0
• ISSN：1948-7185

文摘

The successful preparation of two-dimensional (2D) single crystals can promote the development of organic optoelectronic devices with excellent performance. A Schiff base compound salicylidene(4-dimethylamino)aniline with aggregation induced emission (AIE) property was employed as the building block to fabricate 2D thin single crystal plates with scales from around 50 μm to 1.5 cm. Yellow and red emissive polymorphs were concomitantly obtained during crystallization. The single-crystal-to-single-crystal (SC-to-SC) transformation from yellow polymorph to red one was demonstrated. Furthermore, both polymorphs exhibited amplified spontaneous emission (ASE) properties. Interestingly, the red polymorph displayed size-dependent ASE characteristics. The larger red polymorph showed near-infrared ASE with maximum at 706 nm, whereas the smaller one presented red ASE with maximum at 610 nm. These results suggest that the different scale single crystalline thin films with perfect optoelectronic properties may be fabricated by using the organic molecules with 2D assembly feature.