摘要
采用微波辐射法合成了Sr2CeO4粉末,研究了微波辐射功率和加热时间对Sr2CeO4合成的影响,确定了微波法合成Sr2CeO4的最佳反应条件,并用X射线衍射(XRD)、扫描电镜(SEM)、荧光光谱等测试手段对Sr2CeO4的性能进行了测试。结果表明,Sr2CeO4属正交晶系,产品颗粒形状比较规则,分散性较好,粒径在0.6μm^1.2μm之间。荧光光谱测试表明,用eλx=270nm激发样品,其发射光谱为一宽带,最大峰位于468nm。以=λ468nm激发样品,得到的Sr2CeO4激发光谱也为一宽带,最大峰位于283nm,这个宽带来源于C e4+-O2-的电荷迁移。Sr2CeO4的荧光强度随辐射功率和时间不同发生变化,其中以功率560W、反应时间60m in时荧光强度最强。
The blue emission Sr2CeO4 phosphor powders were prepared using a hybrid microwave synthesis. The influence of different microwave radiation power and heating time on Sr2CeO4 was discussed and the optimum condition to achieve superior Sr2CeO4 phosphor is confirmed. The powders were characterized by X- ray diffraction （XRD）, scanning electron microscope （SEM） and photoluminescence spectra . The results show that the Sr2CeO4 bulk powders exhibited an orthorhombic crystal structure and particles are regular in shape and size and grain size is in the range from 0.6μm to 1.2μm. The excitation spectrum（λem=468nm）of Sr2CeO4 phosphor displays a broad band around 283nm, this broad band is due to the charge transfer （CT） band of O^2- --Ce^4＋. Excited with a radiation of 270nm, a broad emission band is observed with a peak position at 468nm. The emission intensity of Sr2CeO4 phosphor change with different power and time and is the strongest at 560W for 60min.
出处
《稀土》
EI
CAS
CSCD
北大核心
2007年第1期41-44,共4页
Chinese Rare Earths
基金
河北师范大学博士基金项目资助(103261)
