【作者】 东继莲；

【导师】 马沛生； 张邦彦；

【作者基本信息】 天津大学 ， 化学工程， 2006， 硕士

【摘要】 光激励发光材料作为一种新型的材料广泛应用在红外探测、成像、光存储、光学信息处理、辐射计量测定等方面。本论文首先对光激励发光材料的发展以及其结构特点做了简单介绍。对光激励发光材料的发光机理进行了总结与概括。着重描述了典型的光激励发光材料BaFCl:Eu2+在医疗影像版中的应用。制备工艺是获得良好发光材料的关键。本文以BaCl2·2H2O,BaF2,Eu2O3为原料,以NH4Cl作为助熔剂,采用高温固相扩散的方法制备了BaFCl:Eu.并用X射线衍射的方法对产物进行了分析,证明了所得物质即为所需的产物。并通过改变助熔剂NH4Cl的配比、激活剂Eu离子的参杂比例、合成温度、烧结气氛、二次烧结、烧结状态和盛装容器等七个方面的实验条件,做了一系列实验,通过比较样品的发光性能发现它们的发光特性随条件的不同而有一定差异,从而得出了如下结论:在5%-7.5%的助熔剂NH4Cl配比下,激活剂Eu离子的参杂比例为0.004-0.006,烧结温度为750～900℃时,样品的发光强度最好。通过不同反应气氛的比较得知Eu3+的存在对Eu2+的发光起促进作用,二次烧结对增强样品的发光强度有利,用压片法制备的样品的发光性能优于直接粉末制备的方法,用石英材料盛装原料是较好的选择,并且对得出的结论进行了理论分析。更多还原

【Abstract】 Photostimulated luminesence materials were applied extensively to the fields of IR detection, digital imaging, photomemory, information storage, dosimetry, and so on as a new kind of luminesence material. This paper presents an introduction of the development and the structure characteristic of the phostostimulated materials,besides sum up their luminescence mechanism. The typical photostiumlated luminesence material BaFCl:Eu has been used in the medical image plate.Preparation process is the key of getting good luminesence material. In this paper, BaFCl:Eu was prepared with high temperature solid diffusion process. BaCl2·2H2O,BaF2 and Eu2O3 was the raw material,NH4Cl was the melt-suppporting agent. A series of experiments were carried out.They were the proportion of NH4Cl, the proportion of Eu ion, synthetize temperature, calcinations atmosphere, dual-calcination process,calcinations state and container.Through comparing their luminesence efficiency,there are some difference luminesence efficiency if it was prepared by different experiment conditions.So some conclusions were drawn in this paper: when the proportion of fusing agent NH4Cl is 5~7%, the mole proportion of Eu ion is 0.004~0.006,calcinations temperature is 750~900℃,luminesence material BaFCl:Eu have the best luminesence efficiency.Results also showed that Eu3+ can promote the luminescence of Eu2+,and the dual-calcination process can also improve its efficiency.The sample’s luminescence efficiency with pressing sheet is better than powder.Quartaz material is better for the luminescence efficiency.A theoretical interpretation is briefly elucidated also.更多还原