Eu^(3+)掺杂的Sr_2CeO_4荧光材料的燃烧法合成及其性能研究

Combustion Synthesis and Properties of Eu^(3+) Doped Sr_2CeO_4 Phosphor

以尿素作燃料,Sr,Ce和Eu的硝酸盐作反应物,采用燃烧法得到了稀土Eu3+掺杂的Sr2CeO4前驱体粉末。将前驱体在一定温度下烧结3h,合成了红色荧光材料。经过对材料进行X射线衍射(XRD)分析,确定了烧结温度在1050～1200℃时,能够得到纯度较高的产品。用扫描电镜(SEM)观察到样品烧结后的形貌为不规则的椭圆形,粒径范围在1～3μm之间。样品的发射光谱和激发光谱表明,Eu3+在Sr2CeO4基质中有很高的猝灭浓度(10%,摩尔分数),随着Eu3+掺杂浓度的增加,可以使蓝白光调整到红白光,进而到红光。

The precursor powders Eu^(3+)-doped by a combustion process with urea as a fuel, Sr_2CeO_4∶Eu, were prepared. Sintering the precursor powders at certain temperatures for 3 h, Sr_2CeO_4∶Eu phosphor was synthesized. Pure Sr_2CeO_4 phase can be achieved after heat-treatment at 1050～1200℃, as revealed by X-ray diffraction (XRD) data. Particles of Sr_2CeO_4∶Eu phosphor appear to be irregular elliptical and their sizes range from 1 to 3 μm, as indicated by morphological studies from scanning electron microscopy (SEM). The excitation and emission spectra reveal efficient energy transfer from host to Eu^(3+), making the emission light from blue-white to red-white, further to red as the Eu^(3+) concentration gradually changes from low concentration (1%) to high concentration (10%).