(1. 中南大学 材料科学与工程学院 有色金属材料科学与工程教育部重点实验室，长沙 410083；
2. 玉林师范学院 化学系，玉林 537000；3. 长沙理工大学 物理与电子科学学院，长沙 410067)
摘 要: 采用溶剂热技术成功合成晶粒小于100 nm的CeO2׃Eu3+和CeO2纳米晶，其中CeO2׃Eu3+样品在紫外光激发下发出明亮的橙红色光。用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、傅立叶红外(FT-IR)、紫外漫反射(UV-vis)和光致发光(PL)等手段对产品的结构和性能进行分析和表征。结果表明：CeO2׃Eu3+是纯立方萤石结构的单晶粉末；Eu3+已成功掺入CeO2晶格中，纳米级的CeO2׃Eu3+和CeO2的带隙能量分别是2.831和2.925 eV；CeO2׃Eu3+纳米晶在593、612、632 nm处具有较强的发射峰(橙红光)，而且较高的退火温度有利于提高样品的晶化度和荧光强度。
关键字: CeO2׃Eu3+；纳米晶；溶剂热合成；光致发光
（1. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Chemistry, Yulin Normal University, Yulin 537000, China;
3.College of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410067, China）
Abstract:CeO2 and CeO2׃Eu3+ nanocrystals (d≤100 nm) were successfully synthesized by solvothermal reaction. Upon excitation with UV light, the CeO2 ׃Eu3+ powders show bright orange red emissions due to the 4f6 transitions of Eu3+ ions. XRD, SEM, TEM, HRTEM, FT-IR, UV-vis and photoluminescence were used to characterize the samples. The results from XRD and HRTEM reveal that the powders with pure cubic fluorite-type CeO2 phase and monocrystal structure are obtained. It is found from UV-vis and IR that Eu3+ is doped into CeO2 crystal lattice , and the band gap energies of the CeO2׃Eu3+ and CeO2 nanocrystals are 2.831 and 2.925 eV, respectively. The photoluminescence measurements show that the CeO2׃Eu3+ nanocrystals possess good emission intensities at 593, 612 and 632 nm, respectively, and its crystallinity and fluorescence intensity are improved with increasing annealing temperature.
Key words: CeO2׃Eu3+; nanocrystal; solvothermal synthesis; photoluminescence
