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摘要本文以化学共沉淀法制备铕离子掺杂硼铝酸盐的红色荧光粉YAl3（BO3）4：Eu3+荧光粉，其中Eu3+离子的掺杂量分别为2、5、7、10at％。以尿素作为沉淀剂，用氨水控制溶液的pH值为9直至白色胶状沉淀充分，在烘箱中90°C干燥24小时，得到白色前驱体粉末。将此前驱体1 000℃下空气气氛中焙烧6个小时，后随炉冷却得到YAl3（BO3）4：Eu3+荧光粉。
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X射线粉末衍射实验和扫描电镜（SEM）对相组成和表面形貌进行表征；激发光谱和发射光谱分析了荧光粉的发光性能。结果表明，该荧光粉可被258nm的紫外光有效激发，其发射峰最强处位于613nm，是Eu3+的5D0→7F2电偶极跃迁为主。在Y1–xEuxAl3(BO3)4 中当Eu3+的掺量为10%时，发光强度最强，其荧光寿命为1.37ms。24330
毕业论文关键词： 化学共沉淀；红色荧光粉；YAl3（BO3）4：Eu3+；发光性能
Preparation of YAl3 (BO3) 4: Eu3 + phosphors by chemical coprecipitation
Abstract
YAl3(BO3)4: Eu3+ doped with Eu3+ ions of 2, 5, 8 and 10 at% were preparated by chemical coprecipitation. The CO(NH2)2 was considered as precipitant and NH3•H2O was used to control the PH of the solution to 9 until the white colloidal precipitation appeared. The white colloidal precipitation had been dried for 24 hours at 90 °C. The white precursor powder was calcined at 1000°C for 6 hours and was cooled to room temperature. The YAl3 (BO3) 4: Eu3+ phosphors were obtained after grinding.
The phase structure and morphology of YAl3(BO3)4: Eu3+ were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM).The luminescence properties of the phosphors were analyzed by excitation and emission spectra. Results showed that the phosphors can be excited effectively at 258 nm by UV light. The highest emission peak centered at 613 nm attribute to 5D0→7F2 electric dipole transition. The optimal doping concentration of Eu3+ ions in YAl3(BO3)4: Eu3+ phosphors was 10 at%. And the fluorescence lifetime was 1.37 ms.
Keywords：chemical coprecipitation；red phosphor powder；YAl3 (BO3) 4: Eu3+；luminescece properties
摘 要 i
Abstract ii
目 录 iii
1 绪论 1
1.1 稀土发光材料 1
1.1.1 稀土离子的基本特性 1
1.1.2 稀土发光材料的发光特点 2
1.1.3 稀土发光材料的制备 2
1.2 稀土元素Eu 3
1.2.1 Eu3+ 的发光机理 3
1.2.2 Eu的主要用途 4
1.3 四硼酸铝钇YAl3（BO3）4材料(YAB) 4
1.3.1 硼酸盐 5
1.3.2 YAB晶体的结构 6
1.3.3 YAl3(BO3)4:Eu3+荧光粉 7
1.4 本文所用实验方法 7
2 实验部分 8
2.1 实验设备与主要原料 8
2.2 实验内容与步骤 9
2.3 实验过程的工艺控制 10
2.3.1 干燥温度、时间的影响 10
2.3.2 焙烧温度、保温时间的影响 10
2.4 结构和性能测试 11
2.4.1 X射线粉末衍射 11
2.4.2 SEM分析 12
2.4.3 发光性能分析 12
3 结果与讨论 12
3.1 XRD图谱分析 12
3.2 SEM形貌分析 13
3.3 激发、发射光谱分析 14
3.3.1 激发光谱分析 14
3.3.2 发射光谱分析 15
3.3.3 发光强度和Eu3+掺杂浓度的关系 16
3.3.4 荧光寿命 17
4 结论 19
致 谢 20