Bi3 掺杂的GdF3荧光粉的制备及性能研究毕业论文
2022-03-16 20:21:44
论文总字数:19481字
摘 要
稀土元素制备的荧光材料主要由基质和掺杂离子两部分组成,其中基质材料的微观结构以及尺寸形貌对荧光粉体的发光性能有重要影响,而掺杂离子的作用则是改变材料的应用范围。由于GdF3能带间隙较宽、声子能量低且掺杂的三价离子能够在不进行电荷调整、不改变GdF3晶格的情况下置换Gd3 在GdF3晶格中的位置,因此GdF3是重要的稀土离子荧光粉基质材料之一。
本论文采用加热温度梯度小、环境友好、反应条件温和的微波水热法通过调整反应时间、反应温度等工艺参数合成形貌规整、尺寸均一的光盘状GdF3: Bi3 荧光材料。将在不同反应温度制备的光盘状产物进行发光性能测试,在150 ℃下反应1 h的合成产物具有最佳的发光性能。利用Bi3 掺杂来提高GdF3: Eu3 荧光材料的发光性能。将不同含量组合的Eu3 和Bi3 共掺于光盘状GdF3晶体中,实验结果表明Bi3 能够有效敏化Eu3 ,由于两种离子之间的相互作用使得荧光材料的发光性能得到大幅提高。
关键字: GdF3 微波水热法 荧光性能 形貌 稀土离子掺杂
The research on preparation and performance of Bi3 doped GdF3 fluorescent powder
ABSTRACT
Rare earth fluorescent material mainly composed of two parts, the host materials and the doped ions. Wherein the host material plays a major role and the morphology has an important influence on the luminescent properties, the doped ions will change the application of the material. GdF3 has a wide band gap, low phonon energy, and the Gd3 in the GdF3 lattice can be replaced by rare earth ions without extra charge, therefore it is one kind of important host material.
Herein the GdF3: Eu3 / Bi3 was prepared by microwave hydrothermal method, which has a small temperature gradient and it is environmentally friendly with facial reaction. Uniform size of the disc-like GdF3: Bi3 could be obtained by adjusting the reaction time and temperature. The luminescent properties shows that the disc-like product prepared at 150 oC for 1 h was the best one. Under the excitation of 393nm, GdF3: Eu3 luminescent powder emitted orange light of 592nm, and Gd0.85F3: 0.15Eu3 has the strongest emission intensity of orange light. Bi3 was doped to improve the luminescence properties of GdF3: Eu3 fluorescent material. The experiment results showed that Bi3 could effectively sensitized Eu3 , due to the interaction between those two ions, the luminescence properties of the fluorescent material have been greatly improved.
Key words: GdF3;Microwave-assisted hydrothermal;Luminescent property;Morphology;Rare earth doping
目 录
摘要 I
ABSTRACT II
第一章 绪论 1
1.1荧光材料研究背景 1
1.2稀土离子的能量传递 1
1.3发光材料的基质 3
1.3.1钒酸盐基质荧光材料 3
1.3.2氟化物基质材料 3
1.3.3钨/钼酸盐基质荧光材料 4
1.3.4磷酸盐基质荧光材料 4
1.3.5稀土氧化物基质荧光材料 4
1.4稀土离子掺杂荧光材料的合成方法 5
1.4.1高温固相反应法 5
1.4.2液固溶法(LSS) 5
1.4.3溶胶-凝胶法 5
1.4.4微波水热法 6
1.5研究背景与内容 6
第二章 微波水热法制备GdF3: Eu3 / Bi3 及其发光性能表征 8
2.1实验部分 8
2.1.1实验原料以及实验仪器 8
2.1.2实验方法及步骤 8
2.1.3表征方法 9
2.2 结果与讨论 10
2.2.1 合成温度对GdF3: Eu3 物相和形貌的影响 10
2.2.2反应时间对GdF3: Eu3 物相和形貌的影响 12
2.2.3 GdF3: Eu3 的荧光性能 13
2.2.4 GdF3: Eu3 / Bi3 荧光性能分析 15
第三章 结论与展望 17
3.1 结论 17
3.2 展望 17
参考文献 18
致谢 21
第一章 绪论
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