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CeO₂:Eu³⁺纳米晶的溶剂热合成及其发光性能

Solvothermal synthesis and photoluminescence of CeO₂:Eu³⁺ nanocrystals

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【Author】 HUANG Ming-chu1, LIU Guo-cong1, 2, LI Hai-bin1, 3, YIN Zhi-min1 (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)

【机构】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；玉林师范学院化学系；长沙理工大学物理与电子科学学院；

【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。更多还原

【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.更多还原