Reproducible on-off switching of solid-state luminescence by controlling molecular packing through heat-mode interconversion
Reproducible on-off switching of solid-state luminescence by controlling molecular packing through heat-mode interconversion
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DOI：
10.1038/nmat1454
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发表时间：
2005-09-01
期刊：
影响因子：
41.2
通讯作者：
Araki, K
中科院分区：
文献类型：
--
作者：
Mutai, T;Satou, H;Araki, K
有机发光固体在各种应用领域中吸引了越来越多的兴趣（1-3）。修饰或改变其组分分子的化学结构是调节其发光性质的最常见方法。然而，对于具有高效率和可再现性的固态发光的动态调谐或切换，成功的实例是有限的（2，4），因为固态中的化学反应经常遇到不充分的转化、单向反应或其发光性质的损失。一个有前途的方法是通过改变固态分子堆积的模式来控制发光性质，而不需要化学反应。在这里，我们表明，2，2 '：6'，2“-三联吡啶（5），几乎不发光的形式，无定形固体或针状晶体（6），显示出强烈的蓝色发光后，形成一个板状晶体。固态发光的有效和可重复的开关由板和针晶体之间的热模式相互转换证明。由于分子堆积模式的改变不需要化学反应，因此本研究结果将为开发可以通过外部热刺激打开和关闭的新型有机发光固体开辟道路。
Organic luminescent solids are attracting increasing interest in various fields of application(1-3). Modification or alteration of the chemical structures of their component molecules is the most common approach for tuning their luminescence properties. However, for dynamic tuning or switching of solid-state luminescence with high efficiency and reproducibility successful examples are limited(2,4) as chemical reactions in the solid state frequently encounter insufficient conversion, one-way reactions or loss of their luminescence properties. One promising approach is to control the luminescence properties by altering the mode of solid-state molecular packing without chemical reactions. Here, we show that 2, 2':6',2 ''-terpyridine(5), practically non-luminescent in the form of amorphous solid or needle crystal(6), shows strong blue luminescence upon formation of a plate crystal. Efficient and reproducible on-off switching of solid-state luminescence is demonstrated by heat-mode interconversion between the plate and needle crystals. Because alteration of the mode of molecular packing does not require chemical reactions, the present findings would open the way for the development of novel organic luminescent solids that can be switched on and off by external thermal stimuli.