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摘要：随着科技的发展和进步，有着独特电子层结构的稀土元素开始应用在越来越多的高科技新兴领域上。例如，发光材料、催化剂等。它为我们的科研产品带来了质的飞越。我国身为稀土大国，也开始重视对于稀土领域的研究。尤其是在稀土发光材料这一方面，通过稀土发光材料的吸收能力强、转换率高等优点可以制备出显色稳定性好、发光效率高的稀土荧光粉。34758
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本文首先简单得概述了发光材料的发光原理、发光材料的分类、发光材料的主要发光过程以及评定发光材料优良的一些指标。而后探讨了稀土发光材料的一些种类、特性、制备方法，以及本课题主要研究对象钼钨酸盐的一些性能特点的总结。实验部分是通过水热法制备NaRe(MoO4)x(WO4)2-x:Ln3+(Re=Y; Ln3+=Eu, Tb),然后利用SEM, XRD和荧光光谱仪等方法对所制备的样品进行表征。本课题制备稀土钼钨酸盐的创新点在于将钼酸盐与钨酸盐一比一混合制备，并且选择水热法为制备方法，利用EDTA为螯合剂，观察在正交反应条件下（改变溶液酸碱度环境、稀土与钼钨酸盐的比例等）所制备出钼钨酸盐的形貌特征。在制备出稀土钼钨酸盐的情况下，进一步研究通过掺杂了不同比例的Eu3+和Tb3+对于NaRe(MoO4)x(WO4)2-x:Ln3+(Re=Y; Ln3+=Eu, Tb)的发光性质影响。
主要内容为：利用水热法，在180℃、恒温条件下，选用钼酸钠和钨酸钠作为钼钨源制备钼钨酸盐，其中改变溶液的PH环境，利用X射线衍射仪和透镜电镜对样品进行表征，根据样品形貌择优选择后续最佳反应时间。
利用溶剂热法，在180℃、最佳PH环境、恒温条件下，选用钼酸钠和钨酸钠作为钼钨源制备钼钨酸盐，以Y作为稀土离子源，改变反应物比例进行正交来制备钼钨酸盐，利用X射线衍射仪和透镜电镜对样品形貌进行表征。
以Y的钼钨酸盐作为基质，分析掺杂Eu3+和Tb3+在这些基质中的发光材料发光特性。
毕业论文关键词：稀土钼钨酸盐；水热法；发光材料
The study on preparation and properties of Rare Earth molybdenum tungstate
Abstract: With the development and progress of science and technology, having a unique structure of the electron shell of rare earth elements as applied in an increasing number of emerging high-tech fields. For example, light-emitting materials and catalysts. It brought a qualitative leap for our research products. As a big country of rare earth, rare earth began to pay attention to research in the field. Especially in the rare earth luminescent materials that, through strong absorptive capacity of rare earth luminescent materials, conversion rate, etc. can be prepared good color stability, high luminous efficiency rare earth phosphors.
This article was first briefly outlines the luminescent material emitting principle, classification luminescent material, the main emission process luminescent material and luminescent material excellent assessment indicators. Then discuss the summary of some species of rare earth luminescent materials, properties, preparation, and the main object of this topic molybdenum tungstate some performance characteristics. Experimental part is prepared by hydrothermal NaRe (MoO4) (WO4): Ln3+ (Re = Y; Ln3+= Eu, Tb), then use the SEM, XRD and fluorescence spectroscopy and other methods of sample preparation were characterized. The innovation of this issue molybdenum producing a rare earth tungstate that the molybdate and tungstate prepared by mixing one to one, and select the hydrothermal method of preparation, the use of EDTA is a chelating agent, was observed under crossed reaction conditions (change solution environment, rare earth and ratio of molybdenum tungstate pH, etc.) prepared by morphology molybdenum tungstate. In the case of producing a rare earth molybdenum tungstate, further research on light-emitting properties of Eu3 + and Tb3 + for NaRe (MoO4) (WO4) in varying proportions by doping NaRe (MoO4) (WO4): Ln3+(Re = Y; Ln3+ = Eu, Tb).