掺稀土多孔硅中稀土光学活化的新方法微波热法  

A Novel Approach for Optical Activation of Rare Earths in Rare Earth - doped Porous Silicon Microwave Heating Method

作　　者：龚孟濂[1] 蔡少华[1] 杨燕生[1] 周建英 石建新[1] 田峻[1] 

机构地区：[1]中山大学化学与化工学院 [2]超快速激光光谱学国家重点实验室,广州510275

出　　处：《化学学报》1999年第8期901-906,共6页Acta Chimica Sinica

基　　金：广东省自然科学基金;马灿安教育基金资助课题

摘　　要：首次报道掺稀土多孔硅中稀土光学活化的一种新方法——微波热法.经微波加热处理后,掺稀土多孔硅样品外观均匀;室温下,分别观察到掺铒多孔硅在～1.54μm处、掺钕多孔硅在～1.06μm处强的光致发光.除起加热作用外,微波与样品之间的非热相互作用在稀土的光学活化方面也起重要作用.A novel approach for the optical activation of rare earths in rare earth - doped porous silicon (PS: RE) , microwave heating method, was first reported. The effects of sample - placement modes and microwave heating time on the room - temperature photoluminescence in the infrared region for PS: Er and PS: Nd, prepared with constant - potential electrochemical doping, were investigated. The heated samples were observed to be homogeneous in appearance and to emit intense room - temperaturephotoluminescence around 1.54μm and 1.06μm, which are assigned to the intrashell 4f - 4f transitions ofEr3+ ions (4I13/2→4I15/2) and Nd3+ ions (4F3/2→4I11/2) , respectively. In addition to the thermal activation, the non - thermal interaction of microwave radiation with PS: RE, mainly the spread of rare earths and the trapping of oxygen with rare earths in the porous layer, is considered to play an important role in the optical activation of RE3+ ions.

关 键 词：多孔硅 稀土 微波热法 光学活化 光致发光 掺杂 

分 类 号：TN204[电子电信—物理电子学]