稀土掺杂Ln2Mo3O12(Ln=La, Y, Gd) 荧光粉的制备及其光谱调控研究

论文总字数：36100字

目 录

摘要................................................ .......................Ⅳ

Abstract............................................ .......................Ⅴ

1 绪论......................................................................1

1.1荧光粉的发展历史及发光机理................................................ 1

1.1.1发展历史............................................................. 1

1.1.2发光机理............................................................. 1

1.2荧光粉的制备方法.......................................................... 1

1.2.1高温固相反应法....................................................... 1

1.2.2溶胶—凝胶法......................................................... 2

1.2.3水热合成法........................................................... 2

1.2.4燃烧法............................................................... 2

1.3 钼酸盐荧光粉的研究现状....................................................3

1.3.1钼酸盐荧光粉..................................................... 3

1.3.2碱土金属钼酸盐................................................... 3

1.3.3稀土钼酸盐....................................................... 4

1.3.4复合钼酸盐荧光粉................................................. 5

1.4 选题意义及主要研究内容..................................................6

2 实验方法................................................................ 7

2.1 实验药品及仪器............................................................7

2.1.1 所需药品........................................................7

2.1.2 所需仪器........................................................7

2.2 样品的结构表征与性能测试..................................................7

2.2.1 X射线衍射（XRD）分析............................................7

2.2.2 扫描电镜(SEM)分析...............................................8

2.2.3 紫外可见吸收光谱分析（UV-Vis）.................................. 8

2.2.4 荧光光谱测试（PL）...............................................8

2.3 实验步骤..................................................................8

2.3.1溶胶-凝胶法..................................................... 8

2.3.2水热法.......................................................... 9

3 Ln₂Mo₃O₁₂(Ln=La, Y, Gd): Eu³ 荧光粉的发光性能研究.............10

3.1晶体结构分析（XRD）.................................................... 10

3.2微观形貌分析（SEM）....................................................10

3.3发光性能分析......................................................... 11

3.3.1 La₂Mo₃O₁₂: 5%Eu³ 荧光粉的发光性能..................................11

3.3.2 Y₂Mo₃O₁₂: 5%Eu³ 荧光粉的发光性能...................................14

3.3.3 Gd₂Mo₃O₁₂: 5%Eu³ 荧光粉的发光性能..................................16

3.3.4基质对发光性能的影响............................................ 17

4 稀土离子共掺杂Ln₂Mo₃O₁₂荧光粉的光谱调控研究................19

4.1 La₂Mo₃O₁₂: 3%Sm³ , xEu³ 荧光粉的发光性能研究................ ..........19

4.2 La₂Mo₃O₁₂: 5% Tb³ , xEu³ 荧光粉的发光性能研究...........................25

4.3 Y₂Mo₃O₁₂: 2.5%Dy³ , xEu³ 荧光粉的发光性能研究..........................28

5 总结.....................................................................33

参考文献..................................................................33

致谢....................................................................... 35

稀土掺杂Ln₂Mo₃O₁₂(Ln=La, Y, Gd) 荧光粉

的制备及其光谱调控研究

孙 思 明

，China

Abstract：With the development of science, improvement of technology, new optoelectronic material appear constantly. As a kind of phosphor material, molybdate attracts much more attention. This paper introduces the luminescence properties and main preparation methods of phosphors used for white LED, and summarizes the research progress of molybdate phosphors. In this paper, Ln₂Mo₃O₁₂(Ln=La, Y, Gd) and rare-earth-ions including Eu³ , Sm³ , Dy³ , Tb³ are used as matrices and active ions, respectively. The hydrothermal method and sol-gel method were used to prepare down conversion luminescent phosphors which can be excited by near ultraviolet. It is found that La₂Mo₃O₁₂: 5%Eu³ has a wide excited peak at the range of 250~410nm, which matches the commercial high-power near ultraviolet LED chip. Co-doing of Sm³ /Eu³ 、Tb³ /Eu³ 、Dy³ /Eu³ can realize the spectrum regulation. Moreover, it is found that there is a significant energy transfer between Sm³ /Eu³ and Dy³ /Eu³ ions, while the energy transfer is relatively weak between Tb³ and Eu³ ions in La₂Mo₃O₁₂ matrix.

Key words：rare earth ions doped；phosphor；molybdate；spectrum control

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