Fluorescent Crystalloluminescence of N-Isopropylcarbazole
Fluorescent Crystalloluminescence of N-Isopropylcarbazole
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DOI：
10.1021/jp036000d
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发表时间：
2004-02
影响因子：
3.3
通讯作者：
Yasuyuki Tsuboi;T. Seto;S. Ishizaka;N. Kitamura
中科院分区：
文献类型：
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作者：
Yasuyuki Tsuboi;T. Seto;S. Ishizaka;N. Kitamura
我们观察到当N-异丙基咔唑(NIPCz)从熔融状态结晶到结晶聚集体时发出的非常明亮的可见发光。样品晶体在玻璃板上加热到熔点(380K)以上，然后在环境条件下逐渐冷却。当温度降到350K以下时，发生了突然的快速结晶，并伴随着蓝白色的发光。对这一现象的视频成像显示，结晶和发光都发生在-lt；0.5ms的同一时间帧内，这表明这两种效应是密切相关的，即晶体发光(XTL)。对样品的热分析表明，结晶前的状态不是玻璃固体，而是过冷的液体状态。XTL光谱与NiPCz的光致发光光谱和摩擦发光光谱符合得很好。此外，它的发光强度远高于其他晶体发光材料的报道值。
We have observed very bright visible luminescence from N-isopropylcarbazole (NIPCz) when the compound crystallizes from the molten state to a crystalline aggregate. The sample crystals were heated on a glass plate to above their melting point (380 K) and cooled gradually under ambient conditions. When their temperature fell below 350 K, sudden rapid crystallization took place, accompanied by bluish-white luminescence. Video imaging of the phenomena revealed that both the crystallization and luminescence occurred in the same time frame of <0.5 ms, demonstrating that the two effects were intimately related to each other, i.e., crystalloluminescence (XTL). Thermal analysis of the sample revealed that the preceding state prior to the crystallization was not a glassy solid, but a supercooled liquid state. The XTL spectrum agreed very well with both photo- and triboluminescence spectra of NIPCz. Moreover, its intensity was considerably higher than the reported values for other crystalloluminescent materials suc...