论文总字数：28012字

摘 要

本课题采用高温固相法制备NaLa(MoO₄)₂荧光粉，并用不同量稀土Eu³ ,Dy³ 进行掺杂后测试分析其发光性能，形貌和结构，荧光寿命等。拓展探讨了荧光粉中常见的浓度淬灭原理，Eu³ /Dy³ ET机制及效率。简单的总结为：NaLa(MoO₄)₂:Dy³ 荧光粉PL发射强度和掺杂离子Dy³ 的含量成正相关增，根据实验发现当Dy³ 的在荧光粉中的浓度达到5%时性能最佳，最后随着Dy³ 离子浓度的进一步增加而开始下降，这是有离子浓度淬灭引起的；通过改变稀土Dy³ 和Eu³ 离子的掺杂比例，可以将Dy³ /Eu³ 掺杂的NaLa(MoO₄)₂荧光粉的发射颜色从绿黄色变为黄色，最终变为橙红色。从PL光谱中，可以得出从Dy³ 到Eu³ 离子存在一个有效的ET，当Eu³ 摩尔含量为9％时，这种转移的效率高达70％。最后选用最佳样品和PMMA复合制备光转换膜，测试分析了光转换薄膜的光谱性能和量子产率。光转换薄膜与太能电池背板的结合使用，可以有效利用荧光粉的光谱性能转换太阳能中能量。

关键词：高温固相法 NaLa(MoO₄)₂:Dy³ /Eu³ 荧光粉 ET效率

光转换薄膜 量子产率

Preparation and properties of rare earth based composite PVDF light conversion film

Abstract

This subject uses high-temperature solid-phase method to prepare NaLa(MoO₄)₂ phosphor, and dope test with different amounts of rare earth Eu³ , Dy³ to analyze its luminescence performance, morphology and structure, fluorescence lifetime, etc. The principle of concentration quenching, the mechanism and efficiency of Eu³ /Dy³ ET that are common in phosphors are expanded. A brief summary is:NaLa(MoO₄)₂:Dy³ phosphor PL emission intensity increases positively with the content of doped ion Dy³ . According to experiments, it is found that the best performance is when Dy³ concentration in phosphor reaches 5%, and finally with the further increase of Dy³ ion concentration And it started to decline, which was caused by the quenching of ion concentration; by adjusting the ratio of Dy³ and Eu³ ion concentration, the emission color of Dy³ /Eu³ doped NaLa(MoO₄)₂ phosphor could be changed from green to yellow It is yellow and eventually turns orange-red. From the PL spectrum, it can be concluded that there is an effective ET from Dy³ to Eu³ ion. When the Eu³ ion Molar content is 9%, the efficiency of this transfer is as high as 70%. Finally, the best sample and PMMA were used to prepare the light conversion film, and the spectral performance and quantum yield of the light conversion film were tested and analyzed. The combination of the light conversion film and the back plate of the solar battery can effectively use the spectral properties of the phosphor to convert the energy in solar energy.

Keywords: high temperature solid phase method；NaLa(MoO₄)₂:Dy³ /Eu³ phosphor；ET efficiency；Light conversion film；quantum yield

目录

摘要 I

Abstract II

第一章 绪论 1

1.1 引言 1

1.2 课题背景 1

1.3 课题目标 2

1.4 稀土发光材料发展史 3

1.5 稀土掺杂材料的前景 4

1.6 稀土发光材料的制备方法 5

1.6.1 高温固相法 5

1.6.2基于溶液的化学合成法 5

1.6.3 溶胶凝胶燃烧法 5

1.6.4 聚合法 5

1.7 稀土发光原理 6

1.7.1 稀土荧光的发生 6

1.7.2 下转换发光 6

1.7.3 上转换发光 7

1.8 荧光粉在太阳能电池中的作用 8

1.9 聚偏氟乙烯(PVDF) 8

第二章 实验方案设计 10

2.1 实验原料 10

2.2 实验仪器与设备 10

2.3 实验过程 10

2.4 NaLa(MoO4)2:Dy3 荧光粉的制备 11

第三章 实验预测分析 12

3.1 形貌与结构 12

3.1.1 晶体结构分析：XRD测试 12

3.1.2 形貌分析：SEM测试 12

3.1.3 NaLa(MoO₄)₂:xDy³ 荧光光谱测试 13

3.2 NaLa(MoO₄)₂:Dy³ /yEu³ 荧光光谱测试 14

3.3 浓度淬灭机理的探究 16

3.4 PL衰减曲线 17

3.5 Dy3 /Eu3 ET效率 18

第四章 光转换薄膜制备与性能研究 21

4.1 PVDF/PMMA/荧光粉复合制备转光膜 21

4.2 红外光谱分析 21

4.3 转光膜XRD分析 22

4.4 光转换薄膜的光谱性能和量子产率 23

第五章 实验预测结论 25

5.1 结果与讨论 25

5.2 展望 25

参考文献 27

致谢 31

请支付后下载全文，论文总字数：28012字