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Solid-state fluorescence properties and reversible piezochromic luminescence of aggregation-induced emission-active 9,10-bis[(9,9-dialkylfluorene-2-yl)vinyl] anthracenes In this work, we have synthesized 9,10-bis[(9,9-dialkylfluorene-2-yl)vinyl]anthracene derivatives (FLA-Cn) with propyl, pentyl, and dodecyl side chains to investigate their fluorescence properties. The results show that FLA-Cn exhibit not only an aggregation-induced emission effect but also reversible piezofluorochromic (PFC) behaviour. Interestingly, the fluorescence emission and grinding-induced spectral shifts Δλ（PFC） of FLA-Cn solids are alkyl length-dependent: the longer alkyl-containing FLA-Cn solids show more blue-shifted emission and larger DlPFC. Moreover, the fluorescence emission of ground FLA-C12 solid can recover spontaneously at room temperature, Powder wide-angle X-ray diffraction and differential scanning calorimetry experiments reveal that the transformation between crystalline and amorphous states under various external stimuli is responsible for the PFC behaviour, and the spontaneous recovering emission of amorphized FLA-C12 solid is ascribed to its low cold-crystallization temperature. This work demonstrates once again the accessibility of tuning the solid-state optical properties of organic fluorophores by combining the simple alternation of molecular chemical structure and the physical change of aggregate morphology under external stimuli. |
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聚集诱导发光活性9,10 - 双[（9,9 - 二烷基-2 - 基）乙烯基]蒽的固态荧光性能和可逆压致变色发光 在本工作中，我们已经用异丙基，戊基，和十二烷基侧链合成了9,10 - 双[（9,9 - 二烷基-2 - 基）乙烯基]蒽衍生物（FLA-Cn），并研究它们的荧光性质。结果表明，FLA-Cn不仅具有聚集诱导发光的作用，而且具有可逆压氟致变色（PFC）性能。有趣的是，固态FLA-Cn的荧光发光和研磨引起的光谱位移Δλ是烷基长度依赖性的：FLA-Cn所含烷基越长，发光蓝移约多，DIPFC也越大。此外，研磨FLA-C12固态的荧光发光在室温下能自行恢复，粉末广角X射线衍射和差示扫描量热法的实验表明，在各种外界刺激下，晶态和非晶态之间的转变决定了PFC性能，而非晶化FLA-C12固体的自发恢复发光则归因于它的低冷结晶温度。这项工作再次证明，在外部刺激下，把分子化学结构的简单改变和聚集形态下的物理变化结合起来就可以调整有机荧光固态光学性能。 |
2楼2014-10-18 01:39:33