稀土掺杂氧化物纳米发光材料研究

综述了稀土掺杂纳米发光材料方面的研究进展;主要介绍稀土掺杂氧化物纳米晶与体相材料相比所具有的一些特有的光谱学性质,包括光谱的移动与谱线的展宽、4fN电子的跃迁与弛豫过程、表面局域环境和格位对称性、电子-声子耦合、能量传递、浓度猝灭、温度猝灭以及光诱导发光强度变化等光谱现象,同时也探寻了其中的物理实质。主要对上转换纳米发光材料和一维纳米线/管的发光性质进行了介绍。

Recent Developments on Rare Earth Doped Oxide Nanocrystals

Rare earth activated nanophosphors have attracted extensive attention because of their potential applications in lighting,display and fluorescence bio-label,and also of their elementary importance on understanding of the 4fN electronic transition properties of rare earth ions in nanosized particles.In the latest ten years,a great number of improvements have been achieved in this field.In this review article,we mainly present some important research results on photoluminescence properties of rare earth doped oxide nanophosphors.The contents concern exciton and charge transfer transitions,symmetry sites and local environments surrounding rare earth ions,radiative transition and nonradiative relaxation processses on 4fN states,temprature-quenching and concentration-quenching of luminescence,energy transfer among rare earths,electron-phonon coupling,ultravoilet irradiation induced spectral change and etc.Besides,the luminescence properties of rare earth actived one-dimensional oxide nanowires(tubes,rods)and upconversion nanophosphors were introduced independently.It is expected that more universal conclusions relative to nanoparticle size and structure on the photoluminescence of rare earth actived nanoparticles can be drawn,however,it should be noted that some results introduced here might be still controversal,because some photoluminescence properties depend strongly on the preparation technique and detailed conditions.