摘要
采用燃烧法制备了Gd2O3∶Sm3+和Ag+离子掺杂的Gd2O3∶Sm3+纳米晶材料,根据X射线衍射图谱确定所得纳米样品为纯立方相.在室温下,用275 nm光激发各样品时,可观察到来自Sm3+离子强的荧光发射线,其主发射峰位置分别位于560、602、650 nm处,分别对应着Sm3+离子的4G5/2→6H5/2,4G5/2→6H7/2和4G5/2→6H9/2的电子跃迁,其中以4G5/2→6H7/2跃迁的光谱强度最大.实验表明掺入Ag+离子可使Sm3+离子的荧光发射强度显著增强.通过对样品的XRD、TEM和激发光谱、发射光谱的研究,分析了引起样品荧光强度变化的原因.
In this paper, Gd2O3 ： Sm^3＋ and Ag^＋-doped Gd2O3 ： Sm^3＋ nanocrystals were prepared by a combustion method. Both Gd2O3 ： Sm^3＋ and Ag^＋-doped Gd2O3 ： Sm^3＋ nanocrystals appeared to be cubic crystalline phase according to the XRD results. When excited at 275 nm, Gd2O3 ： Sm^3＋ and Ag^＋-doped Gd2O3 ： Sm^3＋ nanocrystals exhibit similar emission spectra, which consists of the characteristic emission bands of the Sm^3＋ ions （^4G5/2→^6H3, J =5/2, 7/2, 9/2 transitions at 560, 602, 650 nm in the spectra） due to an efficient energy transfer from the Gd2O3 host lattice to the doped Sm^3＋ ions. It was found that the incorporation of the Ag^＋ ions into the Gd2O3 ： Sm^3＋ nanocrystals has greatly enhanced the photoluminescence intensity of Sm^3＋ ions in photoluminescence.
出处
《河南大学学报（自然科学版）》
CAS
北大核心
2008年第4期349-352,共4页
Journal of Henan University:Natural Science
基金
河南省高等学校创新人才培养工程资助课题(200211)
