發(fā)布時間：2018-06-20 05:59

  本文選題：發(fā)光二極管 + 類水滑石材料��； 參考：《福建師范大學(xué)》2015年碩士論文

【摘要】：本文首先通過共沉淀法制備了發(fā)黃色熒光的類水滑石材料,并分別用四種硅烷偶聯(lián)劑對其進行表面處理；其次,利用原位聚合法將性能較好的改性黃色熒光類水滑石與硅樹脂復(fù)合,制成熒光性無機／聚合物納米復(fù)合材料；再次,將上述熒光性類水滑石材料以及熒光性無機／聚合物納米復(fù)合材料分別作為熒光粉以及封裝材料用于LED器件中,并對其性能進行測試。由于Zn-(HQ-4-biph)在藍(lán)光激發(fā)下可發(fā)出明亮的黃光,因此將其作為黃光基團引入水滑石。一定量的鋅離子取代Mg-Al型水滑石板層上的金屬離子,利用硬脂酸鈉修飾水滑石,以利于配體進入水滑石層間,并與板層上相應(yīng)的金屬離子配位,形成一種特殊的“懸掛”式配位方式,得到熒光性類水滑石材料。同時,用偶聯(lián)劑對其進行表面改性,獲得改性的熒光性類水滑石材料。利用XRD、FT-IR、TG、TEM和熒光光譜對樣品進行表征。結(jié)果表明,在藍(lán)光激發(fā)下,改性前后的類水滑石材料均能夠發(fā)出較強的黃光。經(jīng)過偶聯(lián)劑KH-550改性后的類水滑石材料在熱穩(wěn)定性、熒光強度、熒光量子產(chǎn)率以及熒光壽命等性能上皆優(yōu)于未改性的類水滑石材料。同時,XRD測試結(jié)果表明,偶聯(lián)劑改性并不會破壞類水滑石材料原來的層狀結(jié)構(gòu)。通過原位聚合法,制備發(fā)黃色熒光的類水滑石／聚合物納米復(fù)合材料。利用FT-IR、XRD、TEM等對其結(jié)構(gòu)進行表征,用熒光光譜、TG-DSC等對它們的發(fā)光性能、熱性能、以及透光性等進行表征。TEM圖片顯示,黃色熒光類水滑石剝離成片層后分散在硅樹脂基質(zhì)中；熱分析表明該無機／聚合物納米復(fù)合材料具有良好的熱穩(wěn)定性；由于熒光基團的存在,樣品在460 nm左右的藍(lán)光激發(fā)下得到黃光。將上述的熒光類水滑石材料涂敷在LED的InGaN基藍(lán)光芯片(460nm-470nm波段)上,以無機／聚合物復(fù)合材料作為封裝硅樹脂制備LED器件。結(jié)果顯示,各LED器件均可發(fā)出明亮的白光,同時,改性后的熒光材料與未改性相比,有更高的流明效率。而將復(fù)合材料用于LED器件封裝,可在原有基礎(chǔ)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.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN312.8;TB33

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