摘要
采用溶剂热技术成功合成晶粒小于100nm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2.925eV;CeO2:Eu3+纳米晶在593、612、632nm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。
CeO2 and CeO2：Eu^3＋ nanocrystals （d≤100 nm） were successfully synthesized by solvothermal reaction. Upon excitation with UV light, the CeO2 ：Eu^3＋ powders show bright orange red emissions due to the 4f^6 transitions of Eu^3＋ 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 Eu^3＋ is doped into CeO2 crystal lattice, and the band gap energies of the CeO2：Eu^3＋ and CeO2 nanocrystals are 2.831 and 2.925 eV, respectively. The photoluminescence measurements show that the CeO2：Eu^3＋ nanocrystals possess good emission intensities at 593,612 and 632 nm, respectively, and its crystallinity and fluorescence intensity are improved with increasing annealing temperature.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2010年第2期293-300,共8页
The Chinese Journal of Nonferrous Metals
基金
湖南省自然科学重点基金资助项目(08JJ3104)
广西青年基金资助项目(0728107)
广西教育厅基金资助项目(200708LX161)
优秀人才计划项目(G2009033
G2009029)
