掺稀土多孔硅中稀土光学活化的新方法: 微波热法

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-1.5μm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与也起重要作用.

A novel approach for optical activation of rare earths in rare earth- doped porous sillicon: microwave heating method

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 mods and microwave heating time on the room-temperature photoluminescence in the infrared region for PS:Er and PS:Nd, prepared with constant-potenial electrochemical doping,were investigated.The heated samples were observed to be homogeneous in appearance and to emit imtense room- temperature photoluminescence around 1.54μm and 1.60μm, which are assigned to the intrashell 4f-4f transitions of Er^3^+ ions (^4I~1~3~/~2--^4I~1~5~/~2) and Nd^3^+ ions(^4F~3~/~2--^4I~1~1~/~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 pofous layer, is considered to play an important role in the optical activation of RE^3^+ ions.