(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 玉林師范學(xué)院 化學(xué)系，玉林 537000；3. 長(zhǎng)沙理工大學(xué) 物理與電子科學(xué)學(xué)院，長(zhǎng)沙 410067)
摘 要: 采用溶劑熱技術(shù)成功合成晶粒小于100 nm的CeO2׃Eu3+和CeO2納米晶，其中CeO2׃Eu3+樣品在紫外光激發(fā)下發(fā)出明亮的橙紅色光。用X射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)、傅立葉紅外(FT-IR)、紫外漫反射(UV-vis)和光致發(fā)光(PL)等手段對(duì)產(chǎn)品的結(jié)構(gòu)和性能進(jìn)行分析和表征。結(jié)果表明：CeO2׃Eu3+是純立方螢石結(jié)構(gòu)的單晶粉末；Eu3+已成功摻入CeO2晶格中，納米級(jí)的CeO2׃Eu3+和CeO2的帶隙能量分別是2.831和2.925 eV；CeO2׃Eu3+納米晶在593、612、632 nm處具有較強(qiáng)的發(fā)射峰(橙紅光)，而且較高的退火溫度有利于提高樣品的晶化度和熒光強(qiáng)度。
關(guān)鍵字: CeO2׃Eu3+；納米晶；溶劑熱合成；光致發(fā)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
