掺Dy^3＋的Ge-Ga-S玻璃上转换发光性质的研究  

Investigation of Upconversion Emission in Dy^3＋ -doped Ge-Ga-S Glasses

作　　者：金珍娟[1] 聂秋华[1] 徐铁峰[1] 戴世勋[1] 沈祥[1] 壬训四[1] 

机构地区：[1]宁波大学信息科学与工程学院,宁波315211

出　　处：《武汉理工大学学报》2007年第E01期81-85,共5页Journal of Wuhan University of Technology

基　　金：国家973前期预研项目（2006CB708607）、浙江省科技计划项目（2006C11127）和宁波市自然科学基金项目（2006A610056）.

摘　　要：采用熔融-猝冷法制备了Dy^3＋掺杂的Ge-Ga-S玻璃样品，用差热分析法分析了玻璃的热学稳定性，研究了该玻璃样品的吸收光谱性质。应用Judd—Ofelt理论计算了Dy^3＋的振子强度、自发辐射跃迁几率、辐射寿命、荧光分支比等光谱参数，并拟合了相应的强度参数皿（t=2，4，6）。探讨了862nm波长激发下玻璃上转换发光的机理，以及掺杂离子浓度与上转换发光强度的关系。结果表明862nm激光泵浦掺杂0、5wt％Dy^3＋的玻璃样品，可以观察到很强的576nm的黄光，对应于Dy^3＋;^4F9／2→^6H13／2的跃迁。Dy^3＋ -doped Ge-Ga-S glasses were prepared by the conventional melt-quenching technology, and the thermo-stabilities of samples were studied by differential scanning colourimetry （DSC）. Optical absorption properties of glass samples have been investigated. The intensity parameters Ωt （t = 2,4,6）, oscillator strengths, transition probabilities, exited state lifetimes and the branching ratios have been predicted for Dy^3＋ ions in samples by using the Judd-Ofelt theory. The upconversion emission of the glass under 862 nm excitation and the dependence of the Dy^3＋ concentration were also discussed. It was found that 0.5 wt% Dy^3＋ -doped sample exist the strong yellow upconversion fluorescence at 576 nm by exciting with 862 nm LD, which corresponding to ^4F9/2→^6H13/2 transition.

关 键 词：硫系玻璃 Dy^3+离子 激发光谱 上转换 

分 类 号：TQ171.1[化学工程—玻璃工业]