摘 要稀土元素凭借其独特的4f电子跃迁特征,在发光材料领域有着较好的发展前景,特别是稀土上转换发光材料,一种能将低频率吸收光转化为高频率发射光的新功能材料,具有发射谱线窄、荧光寿命长、Stokes位移大、发光稳定、毒性小等特点,在研究领域中颇受关注。89898
本文研究的是以BaGdF5为基质材料的稀土发光材料,通过改变实验条件以找到适合的溶剂热法合成基质BaGdF5以及不同浓度Sm3+单掺的BaGdF5和不同浓度Er3+和Yb3+共掺的BaGdF5纳米晶,并对合成的产物进行XRD以及TEM表征,检测目标产物、颗粒大小与结晶状况。此外,采用荧光光谱仪测试BaGdF5纳米晶的荧光特性并探索发光机理。
Rare earth elements have a good prospect in the field of luminescent materials due to their unique characteristics of 4f electron transitions。 Especially rare earth conversion materials, which can absorb low-frequency light into new functional materials with high frequency of the emitted light emission characteristics, with narrow spectrum, long fluorescence lifetime, large Stokes shift, light stability, low toxicity, popular in the field of study。
This study is based on BaGdF5 as the matrix material of rare earth luminescent materials, BaGdF5 nanocrystals by changing the experimental conditions to find a suitable solvothermal synthesis of matrix BaGdF5 and different concentrations of Sm3+ doped BaGdF5 and different concentrations of Er3+ and Yb3+ Co doped, The synthesized products were characterized by XRD and TEM, and the target product, particle size and crystallization were detected。 In addition, fluorescence properties of BaGdF5 nanocrystals were measured by fluorescence spectrometer to investigate the luminescence mechanism。
毕业论文关键词:BaGdF5纳米晶; 稀土掺杂; 溶剂热法;光谱特性
Keyword: BaGdF5 nanomaterials; rare earth doped; hydrothermal method: luminescence properties
目录
目录 4
1、引言 5
1。1稀土离子的发光特点 5
1。2稀土掺杂的上转换发光材料与下转换发光材料 5
1。3稀土氟化物纳米晶的特征 6
1。4稀土掺杂的BaGdF5纳米晶的性能特征与应用 6
1。5稀土掺杂的BaGdF5纳米晶的合成方法 7
1。6稀土掺杂的BaGdF5纳米晶的结构检测与光谱特性 7
2、实验部分 8
2。1实验原料与实验仪器 8
2。1。1实验原料 8
2。1。2实验仪器 8
2。2改进前稀土掺杂的BaGdF5纳米晶的合成步骤 8
2。3改进后稀土掺杂的BaGdF5纳米晶的合成步骤 10
2。4表征方法 10
3、结果与讨论 10
3。1XRD测试 10
3。1。1改进前后结果对比 10
3。1。2系列稀土掺杂浓度的BaGdF5纳米晶XRD测试 12
3。2透射电镜测试 13
3。3荧光光谱仪测试 14
3。3。1单掺Sm3+的BaGdF5纳米晶的下转换荧光性能 15
3。3。2共掺Er3+/Yb3+的BaGdF5纳米晶的上转换荧光性能