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摘 要：以磷酸盐作为基质制备的稀土发光材料具有合成温度低、物化学稳定性好、制备简单、量子效率高等优点，因而使其成为LED用荧光粉的重要基质材料来源。研究Eu2+激活的磷酸盐发光材料的发光性质不仅其具有科研方面的意义，在实际应用方面也具有潜在的价值。本实验采取高温固相法制备了Ca3-x(PO4)2:xEu2+ (0≤x≤0.06)系列样品，确定了其合成的最佳条件；通过研究其在近紫外区域激发光谱，得知样品在近紫外LED芯片的发射波长区域有较强的吸收，并可与之匹配；经测试样品的发射光谱，在波长为375-650nm范围内可观察到两个发射带，均为Eu2+离子的跃迁，样品整体上呈现了近白色发光，并且确定了Ca2.97(PO4)2:0.03Eu2+为最佳样品。55181
毕业论文关键词：稀土发光材料，Ca3(PO4)2:Eu2+，固相法，发光性质
Abstract: Phosphate-based luminescent materials have low synthesis temperature, good chemical stability, easy preparation, and high quantum efficiency, which make phosphate become an important matrix material for LED phosphors. Investigation on luminescent properties of Eu2+ activated phosphate has not only scientific significance, but also the value of practical application. A series of Ca3-x(PO4)2:xEu2+ (0≤x≤0.06) samples were prepared by high temperature solid-state method in this experiment, and the optimal preparation condition was found. By learning the excitation spectra in UV range, it can be seen the samples have strong absorption in the emission wavelength region of near UV LED chip, which can be matched with the near UV LED chip. By measuring the emission spectra of the samples, we can observe the two emission bands in the range of 375-650 nm, and they are abscribed to the transitions of Eu2+ ion. The samples take on nearly white light emitting in the whole. Finally we determine the Ca2.97(PO4)2:0.03Eu2+ is the best sample.
Keyword: Rare earth luminescent materials, Ca3(PO4)2:Eu2+, Solid-state method, Luminescent properties
目 录
1 前言 4
1.1 研究背景 4
1.2 稀土发光材料的应用 4
1.3.2 发光原理 6
1.3.3 LED应用 7
1.4 LED白光的实现方式 7
1.4.1 用蓝光LED芯片激发黄色荧光粉 7
1.4.2 用近紫外光LED芯片激发三基色荧光粉 7
1.5 发光基质：磷酸盐 7
2 实验部分 8
2.1 主要试剂和仪器 8
2.1.1 实验所用主要试剂 8
2.1.2 实验主要设备 8
2.2 固相法介绍 9
2.2.1 固相法概述 9
2.2.2 固相法优缺点 9
2.3 实验过程 10
2.4 样品的测试 10
2.4.1 X射线粉末衍射(XRD) 10
2.4.2 荧光性能测试 10
3 实验结果及讨论 10
3.1 确定最佳制备条件 10
3.2 样品的发光性质研究 11
结 论