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Another interesting phenomenon is the PFC behaviour of pure FLA-C12 solid. Just ground FLA-C12 solid emits yellow fluorescence, however, when it is left standing at room temperature, the fluorescence colour changes with the increase of standing time and gradually recovers to the original green emission (Fig. 5, top). The lower part of Fig. 5 is the change curve of the peak emission wavelength of ground FLA-C12 solid versus the standing time. It is shown that the rapid recovering in uorescence colour and emission happens within the initial 10 min (form 553 to 522 nm), and standing for 60 min, the fluorescence emission (515 nm) is almost identical with the pristine solid (514 nm) and almost unchanged further. In view of the changes in fluorescence colour and emission spectra, grinding has the same effect as pressing. On the other hand, unlike FLAC12, the fluorescence colours and emission spectra of ground FLA-C3 and FLA-C5 solids remain orange and yellow over 24 h at room temperature. These findings suggest that we can endow 9,10-diarylvinyl-anthracene dyes with stable or self-recovering PFC behaviour by altering the end-arylenes and tuning the alkyl length. PFC materials with tunable recovering behaviour could be useful for various applications. |
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真强必胜: 金币+2, 谢谢 2014-10-21 14:26:26
yhc0316: 金币+35, 翻译EPI+1 2014-10-21 18:21:51
真强必胜: 金币+2, 谢谢 2014-10-21 14:26:26
yhc0316: 金币+35, 翻译EPI+1 2014-10-21 18:21:51
| 另一个有趣的现象是纯FLA-C12固体的PFC性能。只有研磨FLA-C12固体发黄色荧光，但当它被放置在室温下，随静置时间的增加，荧光颜色发生变化并逐渐恢复到原来的绿色发光（图5，上半部分）。图5的下部是研磨FLA-C12固体的峰值发光波长与静置时间的变化曲线。结果显示，荧光颜色和发光在最初的10分钟内快速恢复（从553至522纳米），静置60分钟后，荧光发光（515纳米）与原始固体（514纳米）几乎相同，而且几乎没有进一步变化。鉴于荧光颜色和发光光谱的变化，研磨和加压具有相同的效果。另一方面，不同于FLAC12，研磨FLA-C3和FLA-C5固体的荧光颜色和发光光谱在室温下保持橙色和黄色超过24小时以上。这些结果表明，我们可以通过改变末端亚芳基和调节烷基长度使9,10 - 二芳基乙烯基蒽染料具有稳定或自恢复PFC性能。具有可调恢复性能的PFC材料对各种应用是有用的。 |
2楼2014-10-21 11:06:04