稀土硼酸盐发光材料的制备及发光性能的研究

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摘要：稀土元素之所以被重视和应用，是由于其具有独特的电子层结构。当下稀土发光材料的应用随处可见。据统计，在世界上新的发明专利中，与稀土有关的发明占专利总数的五分之一。稀土发光材料的优点在于其吸收能力强，转换率高，特别是在可见光区域具有很强的发射能力，且物理化学性质稳定。由于硼酸盐基质结构组成的多样性及结构中B-O配位方式的不同，适合作不同光源激发的基质材料，使其在照明、通讯、显示等方面的应用价值日渐突显，被认为是很有实用价值的发光材料，当前对稀土硼酸盐研究的主要目的是对其形貌和结构的可控合成，研究形貌-结构-发光性能三者之间的关系，希望获得一种发光效率更高、显色稳定性更好的荧光粉。62150

本论文首先综述了稀土硼酸盐发光材料的性质和常见合成方法，同时也概括性地讨论了发光材料的主要种类、特点、制备方法以及改进的主要途径。然后，通过水热法制备YBO3:R3+( R=Eu , Tb , Sm , Tm )，最后利用SEM 和荧光光谱仪等方法对所制备的样品进行表征。此次制备硼酸盐选用硼酸作为硼源，观察在正交反应条件下（改变反应时间，反应物比例，酸碱度等）所制备出硼酸盐的形貌特征。同时研究了Eu3+ 、Tb3+ 、Sm3+ 和Tm3+在YBO3:R3+(R=Eu, Tb，Sm，Tm)基质中的发光特点以及制备工艺不同时对Eu3+和Tb3+的发光性质的影响。主要内容可分为如下：

1. 利用水热合成法，在180℃、最佳反应时间、恒温条件下，选用硼酸作为硼源制备硼酸盐，其中改变PH值（6~8），利用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PH值。

2. 利用水热合成法，在180℃、最佳反应时间、最佳PH值、恒温条件下，选用硼酸作为硼源，以Y作为稀土离子源，改变反应物比例，并与反应物比例进行正交来制备硼酸盐，利用透镜电镜对样品形貌进行表征。

3. 以Y的硼酸盐作为基质，分析掺杂Eu3+、Tb3+ 、Sm3+ 和Tm3+ 在这些基质中的发光材料发光特性。

毕业论文关键词：稀土硼酸盐；硼酸；水热合成法；发光材料

The study on preparation and luminescent properties of rare earth borates luminescent material

Abstract: Application of rare earth luminescent materials present everywhere. According to statistics, in the new world patent, the rare earth-related inventions accounted for one-fifth of the total number of patents. The reason is taken seriously and application of rare earth elements, because of its unique electron shell structure. Rare earth luminescent materials advantage lies in its ability to absorb, conversion rate, in particular, has a strong ability to emit in the visible region, and stable physical and chemical properties. Since the persity of different structures borate matrix structure consisting of a B-O coordination mode, the matrix materials suitable for different light sources of excitation, the value of its application in the lighting, communications, increasingly highlight display or the like, it is considered to be very practical value of the light-emitting material, the main purpose of the current study is a rare earth borate controlled synthesis its morphology and structure, morphology studies - structure - relations between the three luminescent properties, hoping to get a light higher efficiency, better color stability of the phosphor.

This paper first reviews the nature and common synthesis methods of rare earth borates luminescent materials, but also a general discussion of the main types of luminescent materials, characteristics, preparation methods, and the main way to improvement. Then, prepared by hydrothermal YBO3: R3 + (R = Eu3 +, Tb3 +, Sm3 +, Tm3 +, Dy3 +), and finally by SEM and fluorescence spectroscopy and other methods of the prepared samples were characterized. The choice of acid as prepared in borate boron source, and observed under crossed reaction conditions (type of solvent and the change ratio, reaction time, ratio of reactants, PH, etc.) borate prepared topographical features. Also studied Eu3 +, Tb3 +, Sm3 +, Tm3 + in YBO3: R3 + ( R = Eu3 +, Tb3 +, Sm3 +, Tm3 +) two substrates of the light emitting characteristics and the preparation process is not the same for Eu3 + and Effect of Tb3 + luminescence properties. The main content can be pided as follows: