Lu_2O_3:Eu^(3+)纳米荧光粉的制备和发光性能

Synthesis and Luminescent Properties of Lu_2O_3:Eu^(3+) Nano-phosphor

用X射线衍射谱(XRD)、扫描电镜(SEM)、能量色散X射线谱(EDX)、光致发光谱(PL)和X射线激发发射谱(XEL)对制备的Lu_2O_3:Eu^(3+)纳米粉末的晶体结构、形貌和光谱进行表征.结果表明:采用溶胶-凝胶法制备的粉末颗粒为Eu^(3+)离子掺杂的立方相Lu_2O_3多晶结构;在紫外区的两个吸收峰对应于Lu_2O_3晶格的基质吸收和O2-的2p轨道到Eu^(3+)的4f轨道跃迁的电荷迁移吸收(CTB);在254nm紫外光和X射线激发下,Lu_2O_3:Eu^(3+)纳米粉末的最强发射峰都位于612nm,归属于Eu^(3+)离子的5 D0→7F2跃迁.

The structure,morphology and spectroscopy of Lu_2O_3：Eu^（3＋）nano-phosphor synthesized by solgel method are characterized by X-ray diffractometer（XRD）,scanning electron microscope（SEM）,energy disperse X-ray spectroscope（EDX）,photoluminescence（PL）and X-ray excited luminescence（XEL）spectra.The results indicate that the as-prepared powder consists of the cubic structural Eu^（3＋）-doped polycrystalline Lu_2O_3 nano-phosphor.The excitation spectrum includes two intense broad bands,which are ascribed to the host absorption of Lu_2O_3 and the O2-→Eu^（3＋）charge transfer band（CTB）.The typical red emission peak under254 nm and X-ray excitation both lies at 612 nm,which is corresponding to the 5 D0→7 F2 transition of Eu^（3＋）ions.