荧光性类水滑石复合材料的制备及在LED中的应用

发布时间：2018-06-20 05:59

本文选题：发光二极管 + 类水滑石材料　；参考：《福建师范大学》2015年硕士论文

【摘要】：本文首先通过共沉淀法制备了发黄色荧光的类水滑石材料,并分别用四种硅烷偶联剂对其进行表面处理；其次,利用原位聚合法将性能较好的改性黄色荧光类水滑石与硅树脂复合,制成荧光性无机／聚合物纳米复合材料；再次,将上述荧光性类水滑石材料以及荧光性无机／聚合物纳米复合材料分别作为荧光粉以及封装材料用于LED器件中,并对其性能进行测试。由于Zn-(HQ-4-biph)在蓝光激发下可发出明亮的黄光,因此将其作为黄光基团引入水滑石。一定量的锌离子取代Mg-Al型水滑石板层上的金属离子,利用硬脂酸钠修饰水滑石,以利于配体进入水滑石层间,并与板层上相应的金属离子配位,形成一种特殊的“悬挂”式配位方式,得到荧光性类水滑石材料。同时,用偶联剂对其进行表面改性,获得改性的荧光性类水滑石材料。利用XRD、FT-IR、TG、TEM和荧光光谱对样品进行表征。结果表明,在蓝光激发下,改性前后的类水滑石材料均能够发出较强的黄光。经过偶联剂KH-550改性后的类水滑石材料在热稳定性、荧光强度、荧光量子产率以及荧光寿命等性能上皆优于未改性的类水滑石材料。同时,XRD测试结果表明,偶联剂改性并不会破坏类水滑石材料原来的层状结构。通过原位聚合法,制备发黄色荧光的类水滑石／聚合物纳米复合材料。利用FT-IR、XRD、TEM等对其结构进行表征,用荧光光谱、TG-DSC等对它们的发光性能、热性能、以及透光性等进行表征。TEM图片显示,黄色荧光类水滑石剥离成片层后分散在硅树脂基质中；热分析表明该无机／聚合物纳米复合材料具有良好的热稳定性；由于荧光基团的存在,样品在460 nm左右的蓝光激发下得到黄光。将上述的荧光类水滑石材料涂敷在LED的InGaN基蓝光芯片(460nm-470nm波段)上,以无机／聚合物复合材料作为封装硅树脂制备LED器件。结果显示,各LED器件均可发出明亮的白光,同时,改性后的荧光材料与未改性相比,有更高的流明效率。而将复合材料用于LED器件封装,可在原有基础上增加LED器件的光效和光通量。
[Abstract]:In this paper, the Yellow fluorite like hydrotalcite materials were prepared by coprecipitation method and were treated with four silane coupling agents respectively. Secondly, in situ polymerization, the modified yellow fluorescent hydrotalcite was combined with silicon resin to make a fluorescent non machine / polymer nanocomposite. The fluorescent hydrotalcite materials and fluorescent inorganic / polymer nanocomposites are used as phosphors and packaging materials in LED devices, and their properties are tested. Because Zn- (HQ-4-biph) can emit bright yellow light under blue light, it is used as yellow light group to introduce hydrotalcite. A certain amount of zinc ion is used. Instead of the metal ions on the Mg-Al type water slide plate layer, the sodium stearate is used to modify the hydrotalcite by using sodium stearate to help the ligands enter the hydrotalcite layer and coordinate with the corresponding metal ions on the plate layer, forming a special "suspended" type of coordination method and obtaining the fluorescent hydrotalcite material. At the same time, the surface modification of the hydrotalcite is obtained by coupling agent. The samples were characterized by XRD, FT-IR, TG, TEM and fluorescence spectra. The results showed that the Modified Hydrotalcite materials were able to emit stronger yellow light under the excitation of blue light. The thermal stability, fluorescence intensity, fluorescence quantum yield and fluorescence of the hydrotalcite like materials after the coupling agent KH-550 modified The life and other properties are superior to those of the unmodified hydrotalcite like materials. At the same time, the XRD test results show that the coupling agent does not destroy the original layered structure of the hydrotalcite like material. By the method of in-situ polymerization, the Yellow fluorite like hydrotalcite / polymer nanocomposites are prepared. The structure is characterized by using FT-IR, XRD, and TEM. Photoluminescence, TG-DSC and other characterization of their luminescence properties, thermal properties, and light transmittance showed that the yellow fluorescent hydrotalcite was separated into the silicon resin matrix and dispersed in the silicon resin matrix. The thermal analysis showed that the inorganic / polymer nanocomposites had good thermal stability, and the sample was 460 n due to the presence of fluorescent groups. The blue light of M is excited by yellow light. The above phosphor hydrotalcite materials are coated on the LED InGaN based blue light chip (460nm-470nm band), and the inorganic / polymer composite materials are used as the encapsulated silicon resin to prepare the LED devices. The results show that all LED devices can produce bright white light, while the modified fluorescent materials and unmodified materials are unmodified. Compared with the higher lumen efficiency, the use of composite materials for LED device encapsulation can increase the luminous efficiency and luminous flux of LED devices on the original basis.
【学位授予单位】：福建师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.8;TB33

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