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%。
YAG：Ce yellow phosphors were prepared by microwave induced sol-gel combustion method using ethylenediaminetetraacetic acid（EDTA） as complexant. The influence of sintering temperature, molar ratio of EDTA to cation, p H value and other additives on the structures and properties of the phosphors were investigated. The results show that the dry gel decomposes at 286.7 ℃, and the mass loss rate is about 63.85%. The gel transforms to YAG phase at about 900 ℃, and only YAG phase exists without any intermediate phase at 1 000 ℃. The optimum molar ratio of EDTA to cation is 1.0, and the characteristic emission peak shows slightly blue shift with increasing EDTA concentration. Especially, the p H value has a key impact on obtaining stable sol-gel system, and high luminescence performance powders are prepared when the pH value reaches 8.0. The emission intensity of YAG：Ce phosphors has a linear relation with the crystallite size. The YAG：Ce particle fabricated by microwave induced has a 6.1% higher luminescence intensity than that without microwave at 1 500 ℃. The luminescence intensity of YAG：Ce phosphor prepared by microwave induced sol-gel combustion method is 56.2% higher than that synthesized by sol-gel method at 1 500 ℃.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2016年第2期257-263,共7页
Materials Science and Engineering of Powder Metallurgy
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)
