稀土掺杂一维二氧化硅纳米棒的制备与发光性质研究
发布时间：2018-09-08 20:04
【摘要】：稀土离子具有特殊的4f电子层结构，能够表现出独特的发光特性，因此稀土离子掺杂的发光材料具有广泛地应用前景。论文选用具有优良的光学、电学和机械特性的二氧化硅材料作为基质，选用稀土铕作为掺杂二氧化硅材料的激活剂。采用简单的溶胶-凝胶法制备了稀土Eu3+单掺杂以及Eu3+-Gd3+共掺杂的一维二氧化硅纳米棒发光材料，，探究了其最佳制备条件及稀土共掺杂的发光机理，这对开辟制备SiO2基质高效荧光材料具有重要意义。具体的研究工作包括以下几个方面： （1）稀土Eu3+单掺杂二氧化硅纳米棒的制备与表征。 探讨了不同实验条件对制备二氧化硅纳米棒的影响，经研究发现，溶液的pH和反应温度对铕离子单掺杂的二氧化硅纳米棒的形貌有着显著的影响。XRD数据显示，产物在2为15°-35°衍射角范围内有一个明显的宽峰，表明样品为无定形态。同时，SEM、TEM图像表明合成的二氧化硅纳米棒尺寸均一并且单分散性和形貌均较好。铕离子掺杂二氧化硅纳米棒在波长为392nm的紫外光激发下，呈现出较强的Eu3+的特征红光发射，且Eu3+的最佳掺杂浓度为10mol%。 （2）稀土Eu3+-Gd3+共掺杂二氧化硅纳米棒的制备与表征。 通过分析，固定Gd3+的最佳掺杂浓度不变，改变Eu3+的掺杂浓度得到SiO2:Eu3+,Gd3+的激发光谱和发射光谱，论文详细的阐述了稀土离子间的能量传递过程，其机理主要为电偶极-电偶极相互作用，是非辐射共振吸收的结果，并得到最佳掺杂组分比是SiO2:10%Eu3+,9%Gd3+。同时，由SEM-TEM研究发现，Eu3+-Gd3+共掺杂后生成的二氧化硅纳米棒在形貌上与单掺杂相比较并没有发生改变。FT-IR数据显示，Eu3+-Gd3+共掺杂SiO2纳米棒的红外光谱的吸收峰位置与单掺Eu3+的SiO2纳米棒的吸收峰位置基本相同。同时，XRD数据说明钆离子的掺入并没有破坏其主体结构。
[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 掳-35 掳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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;O613.72
本文编号：2231557
[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 掳-35 掳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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;O613.72
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