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| In summary,we have designed a novel luminophor,TPA-CO,with a highly distorted structure.Its luminescence on–off switching with high contrast (ΦPL,0.4%→12.3%) was repeatedly achieved by simple grinding–vapour cycles.Both the“bright”and“dark”states were separately obtained bytuning the solidification speed of the melted powders.Moreover,the “bright” state,including the films and the ground powders with poor stability,could turn “dark” upon annealing.The photophysical,optical and structural properties were systematically investigated.The fluorescence“bright” and “dark” states of luminophor TPA-CO corresponded to the partially amorphous state and the crystalline state,respectively.In the crystalline state,the luminogens adopted a more twisted conformation and exhibited weak emission.Upon amorphization by external stimuli, the dye molecules might relax to a more planar conformation and then emit a strong fluorescence. Thus, developing highly distorted molecules with tunable conformations may be a design strategy for developing new stimuli-responsive materials with high contrast. |
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团子小姐: 金币+8, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-18 12:44:47
团子小姐: 金币+8, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-18 12:44:47
| 综上所述，我们设计了一种新型的具有高度扭曲的结构的发光体TPA-CO。可以通过简单的研磨－蒸汽循环来实现其具有重复性、高对比度（ΦPL，0.4％→12.3％）的发光通－断切换。无论是“明”与“暗”的状态可以分别通过调整熔化粉末的固化速度获得。而且，包括膜和研磨粉末的“亮”状态的稳定性差，经退火后可变成“暗”状态。系统地研究了光物理、光学和结构特性。发光体TPA-CO的荧光“亮”和“暗”状态分别对应于部分非结晶状态和结晶状态。在结晶状态下，发光原具有更为扭曲的构象并发出弱荧光。在外界刺激时发生非晶化，染料分子可能会舒展成一个更平面的构象，并散发出强烈的荧光。因此，开发高度扭曲的分子并具有可调构象可能是开发具有高的对比度的新刺激－响应材料的一个设计策略。 |
2楼2014-10-17 01:11:34
