微波诱导溶胶-凝胶燃烧法制备YAG:Ce荧光粉

发布时间：2018-06-21 10:02

本文选题：EDTA络合 + 溶胶-凝胶　；参考：《粉末冶金材料科学与工程》2016年02期

【摘要】：以EDTA为络合剂,采用微波诱导溶胶-凝胶燃烧法制备黄色YAG:Ce荧光粉。研究煅烧温度、EDTA与阳离子的摩尔比、pH值等工艺条件对荧光粉结构和发光性能的影响规律。结果表明:干凝胶分解主要在286.7℃左右,质量损失率达63.85%;干凝胶于900℃煅烧后可以看到明显的YAG晶相峰,1 000℃煅烧后获得分散性好的近球形纯相YAG颗粒,随煅烧温度的升高,荧光粉的结晶度提高,颗粒长大;当EDTA与阳离子的摩尔比为1.0时,荧光粉获得最大的发光强度,并且峰的位置随EDTA浓度的增大发生蓝移;发光强度随pH值的增加先减小后增大,当pH=8.0时,发光强度最大并趋于稳定;YAG:Ce荧光粉的发光强度与粉体颗粒尺寸成正比;以EDTA络合剂,微波诱导使得荧光粉的发光强度提高6.1%,微波诱导溶胶-凝胶燃烧法比溶胶-凝胶法所得荧光粉的发光强度增大56.2%。
[Abstract]:Using EDTA as the complexing agent, the Yellow YAG:Ce phosphor was prepared by microwave induced sol gel combustion. The influence of calcining temperature, molar ratio of EDTA and cations, pH value on the structure and luminescence properties of phosphor was studied. The results showed that the decomposition of dry gel was about 286.7 C, the mass loss rate was 63.85%, and the dry gel was 900. After calcining, the obvious YAG phase peak can be observed. After calcining at 1000 C, the near spherical pure phase YAG particles are obtained. With the increase of calcination temperature, the crystallinity of the phosphor increases and the particles grow. When the molar ratio of EDTA to the cation is 1, the maximum luminescence intensity is obtained, and the position of the peak occurs with the increase of the concentration of EDTA. The luminescence intensity decreases first and then increases with the increase of pH value. When pH=8.0, the luminescence intensity is maximum and tends to be stable; the luminescence intensity of YAG:Ce phosphor is proportional to the particle size of powder; the luminescence intensity of the phosphor is increased by 6.1% by the EDTA complexing agent, and the microwave induced sol gel combustion method is compared with the sol-gel method. The luminescence intensity of powder increases by 56.2%.
【作者单位】：湖南科技大学化学化工学院;中南大学粉末冶金研究院;
【基金】：湖南省自然科学基金资助项目(14JJ4043;13JJ3086;2015JJ6036;2015JC3112) 湖南省教育厅资助项目(14C058;15C0526) 湖南省科技计划项目(2015JC3112) 湖南省普通高校“十二五”专业综合改革试点项目(G21224)
【分类号】：TQ422

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