【摘要】：稀土離子具有特殊的4f電子層結(jié)構(gòu)，能夠表現(xiàn)出獨特的發(fā)光特性，因此稀土離子摻雜的發(fā)光材料具有廣泛地應用前景。論文選用具有優(yōu)良的光學、電學和機械特性的二氧化硅材料作為基質(zhì)，選用稀土銪作為摻雜二氧化硅材料的激活劑。采用簡單的溶膠-凝膠法制備了稀土Eu3+單摻雜以及Eu3+-Gd3+共摻雜的一維二氧化硅納米棒發(fā)光材料，，探究了其最佳制備條件及稀土共摻雜的發(fā)光機理，這對開辟制備SiO2基質(zhì)高效熒光材料具有重要意義。具體的研究工作包括以下幾個方面： （1）稀土Eu3+單摻雜二氧化硅納米棒的制備與表征。 探討了不同實驗條件對制備二氧化硅納米棒的影響，經(jīng)研究發(fā)現(xiàn)，溶液的pH和反應溫度對銪離子單摻雜的二氧化硅納米棒的形貌有著顯著的影響。XRD數(shù)據(jù)顯示，產(chǎn)物在2為15°-35°衍射角范圍內(nèi)有一個明顯的寬峰，表明樣品為無定形態(tài)。同時，SEM、TEM圖像表明合成的二氧化硅納米棒尺寸均一并且單分散性和形貌均較好。銪離子摻雜二氧化硅納米棒在波長為392nm的紫外光激發(fā)下，呈現(xiàn)出較強的Eu3+的特征紅光發(fā)射，且Eu3+的最佳摻雜濃度為10mol%。 （2）稀土Eu3+-Gd3+共摻雜二氧化硅納米棒的制備與表征。 通過分析，固定Gd3+的最佳摻雜濃度不變，改變Eu3+的摻雜濃度得到SiO2:Eu3+,Gd3+的激發(fā)光譜和發(fā)射光譜，論文詳細的闡述了稀土離子間的能量傳遞過程，其機理主要為電偶極-電偶極相互作用，是非輻射共振吸收的結(jié)果，并得到最佳摻雜組分比是SiO2:10%Eu3+,9%Gd3+。同時，由SEM-TEM研究發(fā)現(xiàn)，Eu3+-Gd3+共摻雜后生成的二氧化硅納米棒在形貌上與單摻雜相比較并沒有發(fā)生改變。FT-IR數(shù)據(jù)顯示，Eu3+-Gd3+共摻雜SiO2納米棒的紅外光譜的吸收峰位置與單摻Eu3+的SiO2納米棒的吸收峰位置基本相同。同時，XRD數(shù)據(jù)說明釓離子的摻入并沒有破壞其主體結(jié)構(gòu)。
[Abstract]:Rare earth ions have a special 4f electron layer structure and can exhibit unique luminescence properties. Therefore, rare earth ions doped luminescent materials have a wide application prospect. In this paper, silica with excellent optical, electrical and mechanical properties is chosen as the matrix, and rare earth europium as the activator of doped silica. One-dimensional silica nanorods doped with rare earth Eu3 and co-doped with Eu3 Gd _ 3 were prepared by a simple sol-gel method. The optimum preparation conditions and the luminescence mechanism of rare earth co-doping were investigated. This is of great significance for the preparation of SiO2 substrate high efficient fluorescent materials. The specific research work includes the following aspects: (1) preparation and characterization of rare earth Eu3 mono-doped silica nanorods. The effects of different experimental conditions on the preparation of silica nanorods were investigated. It was found that the pH and reaction temperature of the solution had a significant effect on the morphology of the mono-doped silica nanorods. The product has a broad peak in the range of 15 擄-35 擄diffraction angle, indicating that the sample is amorphous. At the same time, the TEM images of SiO2 nanorods show that the synthesized nanorods are uniform in size and good in monodispersity and morphology. The europium ion doped silica nanorods exhibit strong characteristic red emission of Eu3 under UV excitation at wavelength of 392nm, and the optimum doping concentration of Eu3 is 10mol / cm. (2) preparation and characterization of rare earth Eu3 Gd3 co-doped silica nanorods. The excitation and emission spectra of SiO2:Eu3 Gd3 are obtained by changing the doping concentration of Eu3, and the energy transfer process between rare earth ions is described in detail. The mechanism is mainly electric dipole-electric dipole interaction. The results of non-radiative resonance absorption show that the best doping component ratio is SiO2:10%Eu3 9Gd3. meanwhile The results of SEM-TEM show that the morphology of EU _ 3-Gd _ 3 co-doped silica nanorods has not changed compared with that of mono-doped nanorods. FT-IR data show that the absorption peaks of EU _ 3-Gd _ 3 co-doped SiO2 nanorods are at the same position as that of single-doped Eu3 nanorods. The absorption peaks of SiO2 nanorods are basically the same. At the same time, XRD data show that the incorporation of gadolinium ion does not destroy its main structure.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1;O613.72

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