当前位置：首页 > 不同浓度的Sm3+, Ce3+稀土离子单掺和双掺对荧光粉的发光颜色和发光性质以及Ce3+与Sm3+之间的相互作用
摘 要
本文用溶胶-凝胶法合成了LED用Ca3SiO4Br2: Sm3+, Ce3+荧光粉，利用粉末X射线衍射（PXRD）、荧光光谱对合成的荧光粉进行了表征。探讨了不同浓度的Sm3+, Ce3+稀土离子单掺和双掺对荧光粉的发光颜色和发光性质以及Ce3+与Sm3+之间的相互作用。X-射线衍射谱表明少量的稀土离子掺杂不会改变基质的物相结构；荧光粉Ca3SiO4Br2: 0.02Sm3+, 0.01Ce3+在360 nm的激发光下发射出明亮的蓝紫色光，Ce3+→Sm3+有着比较显著的能量传递。
关键词：溶胶-凝胶；荧光粉；碱土溴硅酸盐；钐（Ⅲ）；铈（Ⅲ）
ABSTRACT
In this paper, Ca3SiO4Br2: Sm3+ and Ce3+ phosphors were synthesized by sol - gel method. The synthesized phosphors were characterized by powder X - ray diffraction (PXRD) and fluorescence spectroscopy. The luminescent and luminescent properties of Sm3+, Ce3+ rare earth ion monodisperse and double doped phosphor were discussed. The interaction between Ce3+ and Sm3+ was also discussed. X-ray diffraction spectra show that a small amount of rare earth ion doping does not change the phase structure of the matrix. Phosphor Ca3SiO4Br2: 0.02Sm3+,0.01Ce3+ emits bright blue-violet light at 360 nm excitation light, and Ce3+ → Sm3+ The energy transfer.
Keywords: sol - gel; phosphor; alkaline earth bromosilicate; Sm3+; Ce3+
XX技校毕业设计（论文）
目 录
第一章 前言 ........................................................................................................................ 1
1.1 发光二极管综述 ........................................................................................................... 1 1.2 稀土荧光粉的发光机理 ............................................................................................... 1 1.3 稀土荧光粉常见的制备方法 ......................................................................................... 2 1.3.1 高温固相法 ............................................................................................................... 2 1.3.2 溶胶-凝胶法 ............................................................................................................. 2 1.3.3 微波热合成法 ........................................................................................................... 2 1.3.4 共沉淀合成法 ........................................................................................................... 3 1.4溴硅酸钙的优点 .............................................................................................................. 3 1.5 本课题研究意义及主要研究内容 ................................................................................. 3 1.5.1 本课题研究意义 ...................................................................................................... 3 1.5.2 本课题研究的主要内容 .......................................................................................... 3
第二章 实验部分 .............................................................................................................. 5
2.1 主要实验试剂 ............................................................................................................... 5 2.2 主要实验仪器 ............................................................................................................... 5 2.3 样品的制备 ................................................................................................................... 6 2.3.1 样品溶胶-凝胶溶液的制备 ..................................................................................... 6 2.3.2 样品湿凝胶的干燥 ................................................................................................... 6 2.3.3 样品烧结 ................................................................................................................... 7 2.4 样品测试 ......................................................................................................................... 7
第三章 结果与讨论 .......................................................................................................... 8
3.1 样品X射线衍射谱分析 .............................................................................................. 8 3.2 样品荧光光谱分析 ....................................................................................................... 9 3.2.1 制备温度对Ca3SiO4Br2: 0.02Sm3+荧光粉发光强度的影响 .................................. 9 3.2.2 单掺双掺荧光光谱比较 ........................................................................................... 9 3.2.3 Ce3+浓度对Ca3-xCexSiO4Br2 发射强度的影响 .................................................... 11 3.2.4 Sm3+ 浓度对Ca3-xSmxSiO4Br2发射强度的影响 .................................................. 11
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XX技校毕业设计（论文）
3.2.5 Ce3+浓度对Ca2.98-xCexSm0.020SiO4Br2发射强度的影响 ...................................... 12 3.3 CIE色坐标分析 .......................................................................................................... 13
第四章 结论 ...................................................................................................................... 15 参 考 文 献 ........................................................................................................................ 16 致 谢 ................................................................................................................................. 18
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