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稀土鉬鎢酸鹽發光材料的制備及性能研究

時間:2019-04-20 21:10來源:畢業論文
利用水熱法,在180℃、恒溫條件下,選用鉬酸鈉和鎢酸鈉作為鉬鎢源制備鉬鎢酸鹽,其中改變溶液的PH環境,利用X射線衍射儀和透鏡電鏡對樣品進行表征,根據樣品形貌擇優選擇后續最

摘要:隨著科技的發展和進步,有著獨特電子層結構的稀土元素開始應用在越來越多的高科技新興領域上。例如,發光材料、催化劑等。它為我們的科研產品帶來了質的飛越。我國身為稀土大國,也開始重視對于稀土領域的研究。尤其是在稀土發光材料這一方面,通過稀土發光材料的吸收能力強、轉換率高等優點可以制備出顯色穩定性好、發光效率高的稀土熒光粉。34758
本文首先簡單得概述了發光材料的發光原理、發光材料的分類、發光材料的主要發光過程以及評定發光材料優良的一些指標。而后探討了稀土發光材料的一些種類、特性、制備方法,以及本課題主要研究對象鉬鎢酸鹽的一些性能特點的總結。實驗部分是通過水熱法制備NaRe(MoO4)x(WO4)2-x:Ln3+(Re=Y; Ln3+=Eu, Tb),然后利用SEM, XRD和熒光光譜儀等方法對所制備的樣品進行表征。本課題制備稀土鉬鎢酸鹽的創新點在于將鉬酸鹽與鎢酸鹽一比一混合制備,并且選擇水熱法為制備方法,利用EDTA為螯合劑,觀察在正交反應條件下(改變溶液酸堿度環境、稀土與鉬鎢酸鹽的比例等)所制備出鉬鎢酸鹽的形貌特征。在制備出稀土鉬鎢酸鹽的情況下,進一步研究通過摻雜了不同比例的Eu3+和Tb3+對于NaRe(MoO4)x(WO4)2-x:Ln3+(Re=Y; Ln3+=Eu, Tb)的發光性質影響。
    主要內容為:利用水熱法,在180℃、恒溫條件下,選用鉬酸鈉和鎢酸鈉作為鉬鎢源制備鉬鎢酸鹽,其中改變溶液的PH環境,利用X射線衍射儀和透鏡電鏡對樣品進行表征,根據樣品形貌擇優選擇后續最佳反應時間。
    利用溶劑熱法,在180℃、最佳PH環境、恒溫條件下,選用鉬酸鈉和鎢酸鈉作為鉬鎢源制備鉬鎢酸鹽,以Y作為稀土離子源,改變反應物比例進行正交來制備鉬鎢酸鹽,利用X射線衍射儀和透鏡電鏡對樣品形貌進行表征。
源¥自%六:維;論-文'網=www.aftnzs.live

以Y的鉬鎢酸鹽作為基質,分析摻雜Eu3+和Tb3+在這些基質中的發光材料發光特性。
畢業論文關鍵詞:稀土鉬鎢酸鹽;水熱法;發光材料
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). 稀土鉬鎢酸鹽發光材料的制備及性能研究:http://www.aftnzs.live/huaxue/20190420/32392.html
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