Controllable Synthesis of Organic Microcrystals with Tunable Emission Color and Morphology Based on Molecular Packing Mode,Small

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Controllable Synthesis of Organic Microcrystals with Tunable Emission Color and Morphology Based on Molecular Packing Mode
Small ( IF 13.0 ) Pub Date : 2017-11-17 , DOI: 10.1002/smll.201702952
Zhi-Zhou Li ₁ , Liang-Sheng Liao _{1,

2} , Xue-Dong Wang _{1,

3}

Affiliation

Organic microcrystals are of essential importance for high fluorescence efficiency, ordered molecular packing mode, minimized defects, and smooth shapes, which are extensively applied in organic optoelectronics. The molecular packing mode significantly influences the optical/electrical properties of organic microcrystals, which makes the controllable preparation of organic microcrystals with desired molecular packing mode extremely important. In the study, yellow‐emissive α phase organic microcrystals with rectangular morphology and green‐emissive β phase perylene microcrystals with rhombic morphology are separately prepared by simply controlling the solution concentration. The distinct molecular staking modes of the H/J‐aggregate are found in these two types of perylene microcrystals, which contribute to the different emission color, morphology, and radiative decay rate. What is more interesting, the α‐doped β phase and the β‐doped α phase organic microcrystals can also be fabricated by modulating the evaporation rate from 100 to 10 µL min⁻¹. The findings can contribute to the future development of organic optoelectronics at the microscale.

中文翻译：

基于分子堆积模式的可控合成颜色和形态可调的有机微晶

有机微晶对于高荧光效率，有序的分子堆积模式，最小化的缺陷和光滑的形状至关重要，已广泛应用于有机光电子学中。分子堆积模式显着影响有机微晶的光电性质，这使得具有所需分子堆积模式的有机微晶的可控制备极为重要。在研究中，通过简单地控制溶液浓度，分别制备了具有矩形形态的黄色发光α相有机微晶和具有菱形形态的绿色发光β相per微晶。H / J的独特分子放样模式在这两种类型的micro微晶中发现了聚集体，它们导致了不同的发射颜色，形态和辐射衰减率。更有趣的是，也可以通过将蒸发速率从100 µL min ^-1调制来制备α掺杂的β相和β掺杂的α相有机微晶。这些发现可以为微观上有机光电的未来发展做出贡献。

更新日期：2017-11-17

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