氧化铟锡纳米粒子的低温溶剂热法制备和上转换发光

发布时间：2018-04-13 11:37

  本文选题：上转换发光 + 纳米粒子　； 参考：《暨南大学》2010年硕士论文

【摘要】： 稀土荧光及上转换纳米发光材料在荧光体、显示显像、固态光源、X射线增光屏、激光和光纤放大以及生物荧光探针等领域具有广泛的应用。稀土发光具有吸收能力强,转换效率高,可发射从紫外线到红外光的光谱等优点。而上转换发光是稀土发光的一种独特形式,稀土上转换纳米发光材料在红外光激发下,可产生可见发射,且发射谱线窄(寿命长),发光稳定(不易受环境影响)和荧光背景低。近年来,人们对荧光标记材料产生了浓厚的兴趣,特别是随着纳米技术的发展,能够进行生物标记的无机纳米晶体成为人们研究的热点,但是由于生物发光背景同样会产生荧光从而对荧光检测形成干扰,于是不会产生背景干扰的稀土上转换纳米发光标记物引起了人们的注意。目前世界上上转换纳米荧光材料正处在发展阶段,材料的选择和合成有待于深入细致的研究。本文对上转换发光纳米晶的合成和发光做了系统的讨论。 本论文综述了稀土发光纳米材料的研究现状；简要介绍了稀土离子上转换发光机制及稀土纳米上转换发光材料的制备方法；分析上转换发光材料在研究中存在的问题以及提高上转换发光效率的几种途径。 本文研究采用了有机醇为溶剂的溶剂热法200℃下制备氧化铟锡(ITO)纳米粉体,考察了溶剂类型、反应温度、反应时间、共沉淀pH值、反应釜填充量等对ITO粉体组成、晶型、粒度及性能的影响。 研究发现以乙二醇为溶剂,在低至190℃下反应1h可以得到灰蓝色纳米ITO粉末。由SEM、TEM图可以看出,该粉末为立方晶体或者类球型的纳米颗粒,粉末的粒径均小于100 nm,随着溶剂热反应温度的提高,ITO粉体的结晶性越来越好,加入PEG 4000分散剂后,结晶性和分散性大为提高。 在此基础上,首次利用低温溶剂热法制备了In2O3:Er3+, Yb3+和In2O3:Ho3+, Yb3+两种上转换纳米荧光粉。由发光光谱图表明：Er3+/Ho3+,Yb3+双掺杂对In2O3晶体结构未产生明显的影响,而且所得的粉体颗粒分布均匀,粒径小；两个体系在稀土离子掺杂浓度不断增大时,上转换荧光强度都是先是增强后减弱甚至发生荧光猝灭；而且发光过程都为双光子过程。In2O3:Er3+, Yb3+和In2O3:Ho3+,Yb3+两种上转换纳米荧光粉的成功制备,为把氧化铟纳米材料组装成发光薄膜、生物传感器及用于生物免疫的纳米探针等提供重要的应用前提。
[Abstract]:Rare earth fluorescence and up-conversion nano-luminescent materials have been widely used in the fields of fluorescence, display imaging, solid-state light source X-ray screen, laser and optical fiber amplification and biological fluorescence probe.Rare earth luminescence has the advantages of strong absorption, high conversion efficiency and emission from ultraviolet to infrared light.Upconversion luminescence is a unique form of rare earth luminescence. Under the excitation of infrared light, rare earth up-conversion nano-luminescent materials can produce visible emission, with narrow emission lines (long lifetime, stable luminescence (not easily affected by environment) and low fluorescence background).In recent years, people have a strong interest in fluorescent labeling materials, especially with the development of nanotechnology, inorganic nanocrystals that can be biomarked have become the focus of research.However, because bioluminescent background also produces fluorescence and interferes with fluorescence detection, rare earth up-conversion nano-luminescent labels that do not produce background interference have attracted people's attention.At present, the up-conversion nanoscale fluorescent materials are being developed in the world, and the selection and synthesis of the materials need to be studied deeply and meticulously.The synthesis and luminescence of up-conversion luminescent nanocrystals are systematically discussed in this paper.In this paper, the research status of rare earth luminescent nanomaterials is reviewed, and the upconversion luminescence mechanism of rare earth ions and the preparation methods of rare earth nanocrystalline up-conversion luminescent materials are briefly introduced.The problems existing in the study of up-conversion luminescent materials and several ways to improve the efficiency of up-conversion luminescence are analyzed.In this paper, indium tin oxide (ITO) nano-powders were prepared by solvothermal method using organic alcohol as solvent at 200 鈩，

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