Yb^(3+)/Ho^(3+)共掺Ge_(25)Ga_5S_(70)玻璃中红外发光特性  

MID-INFRARED LUMINESCENCE PROPERTIES OF Yb^(3+)/Ho^(3+) CODOPED Ge_(25)Ga_5S_(70) CHALCOGENIDE GLASSES

作　　者：曹莹[1,2] 戴世勋[2] 张鹏君[2] 李英道[1] 

机构地区：[1]浙江大学宁波理工学院信息科学与工程分院,浙江宁波315100 [2]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《硅酸盐学报》2010年第4期700-703,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(60878042和60978058);中国博士后基金(20080430204);浙江省自然科学基金(Y407253和Y1090996);中科院和宁波大学王宽诚幸福基金资助

摘　　要：用熔融急冷法制备了系列Yb3+/Ho3+共掺Ge25Ga5S70硫系玻璃,测试了样品的吸收光谱以及980nm激光泵浦下中红外荧光光谱特性,用Judd–Ofelt理论计算分析了单掺Ho3+在Ge25Ga5S70玻璃中的强度参数Ωi(i=2,4,6)、自发辐射跃迁几率、荧光分支比和辐射寿命等光谱参数。研究了Yb3+/Ho3+共掺样品在980nm激光泵浦下获得的Ho3+:2.9μm中红外荧光光谱性质,表明Yb3+/Ho3+之间存在能量共振转移。当固定Yb3+掺杂浓度为0.5%(质量分数,下同),随着Ho3+掺杂浓度从0增加为0.7%,Yb3+:2F5/2能级寿命明显单调下降,说明Yb3+/Ho3+之间有效的能量传递主要来源于Yb3+:2F5/2能级向Ho3+:5I6能级的共振能量传递。运用Futchbauer-Ladenburg公式计算比较了不同掺杂浓度下Ho3+:5I6→5I7跃迁的受激发射截面。The chalcogenide glasses from the composition Ge25Ga5S70 doped at the different ratios of Yb^3＋ to Ho^3＋ were prepared by a melt-quenching technique.The absorption spectra and mid-infrared fluorescence of different glass samples under a laser excitation of 980 nm were measured.The intensity parameters Ωi（i=2,4,6）,transition probabilities,branching ratios and radiative lifetimes were predicted for Ho^3＋ in Ge25Ga5S70 samples by using the Judd-Ofelt theory.The mid-infrared fluorescence spectra of 2.9 μm were investigated at different ratios of Yb^3＋ to Ho^3＋ under the excitation of 980 nm,indicating the presence of an efficient energy transfer between Yb^3＋ and Ho^3＋.The lifetime of the Yb^3＋：2F5/2 level decreased with increasing the concentration of Ho^3＋ from 0 to 0.7%（in mass,the same below） when Yb^3＋ concentration was fixed to 0.5%,showing that the effective energy transfer between Yb^3＋ and Ho^3＋ was mainly attributed to the resonance energy from Yb^3＋：2F5/2 to Ho^3＋：5I6 level.In addition,the emission cross-sections of Ho^3＋：5I6→5I7 in different samples were found using the Futchbauer-Ladenburg equation,respectively.

关 键 词：镱/钬共掺 中红外发光 硫系玻璃 能量转移 

分 类 号：TQ171.1[化学工程—玻璃工业]