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首页> 外文期刊>Advanced Functional Materials >Highly Fluorescent Mesostructured Films That Consist Of Oligo(phenylenevinylene)-silica Hybrid Frameworks
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Highly Fluorescent Mesostructured Films That Consist Of Oligo(phenylenevinylene)-silica Hybrid Frameworks

机译：由低聚（亚苯基亚乙烯基）-二氧化硅杂化骨架组成的高荧光介观结构薄膜

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Highly fluorescent and visible-light-responsive mesostructured organosilica films are successfully obtained by acidic sol-gel polycondensation of oligo(phenylenevinylene) (OPV)-bridged organosilane and tetraethoxysilane precursors is the presence of a template surfactant. The OPV-bridged organosilane precursors with different lateral alkoxy substituents. hexyloxy and 2-ethylhexyloxy, and no substituent, are synthesized by Rh-catalyzed silylation of corresponding aromatic iodides. From the organosilane precursors, three kinds of mesostructured OPV-silica hybrid films are prepared by spin-casting using evaporation-induced self-assembly. UV-vis absorption aad fluorescence behavior of the OPV-silica hybrid films show that the eptieal properties and intermolecular interactions of the OPV moieties embedded within the organosilica frameworks strongly depend on the lateral alkoxy substituents in the precursors. The hexyloxy and 2-ethylhexyloxy substituents prevent aggregation of the OPV units in the organosilica frameworks; this result leads to high fluorescence quantum yields of 0.48-0.61 and 0.61-0.66, respectively, while non-substitution leads to lower fluorescence quantum yields of 0.25-0.34. Fluorescence decay profiles of the organosilica hybrid films also confirm a suppression of the aggregation of OPV moieties by the lateral substituents. These mesostructured organosilica films with significant optical properties in the visible-light region are promising as a new class of phosphor materials.
机译：通过低聚物（亚苯基亚乙烯基）（OPV）桥连的有机硅烷和四乙氧基硅烷前体的酸性溶胶-凝胶缩聚反应，可以成功地获得高度荧光和可见光响应的介孔结构有机硅薄膜，这是由于模板表面活性剂的存在。具有不同侧烷氧基取代基的OPV桥联的有机硅烷前体。己氧基和2-乙基己氧基，没有取代基，是通过Rh催化的相应芳族碘化物的甲硅烷基化反应合成的。从有机硅烷前体中，使用蒸发诱导的自组装通过旋铸法制备了三种介孔结构的OPV-二氧化硅杂化膜。 OPV-二氧化硅杂化膜的紫外可见吸收和荧光行为表明，嵌入有机硅骨架中的OPV部分的肽性质和分子间相互作用在很大程度上取决于前体中的侧向烷氧基取代基。己氧基和2-乙基己氧基取代基可防止有机硅骨架中OPV单元的聚集；该结果导致分别为0.48-0.61和0.61-0.66的高荧光量子产率，而未取代导致更低的0.25-0.34的荧光量子产率。有机二氧化硅杂化膜的荧光衰减曲线也证实了侧向取代基抑制了OPV部分的聚集。这些在可见光区域具有显着光学性能的介孔结构有机硅薄膜有望作为新型的荧光粉材料。

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