稀土掺杂Y_2O_3纳米晶发光材料的研究进展

Research Progress on the Study of Rare Earth Doped Y_2O_ 3 Nanocrystalline Luminescent Materials

总结了近几年稀土掺杂Y2O3纳米晶发光材料的研究工作。回顾了Y2O3:Eu3+纳米晶的制备方法及发光性质,特别是采用溶胶–凝胶热解过程,在激发光谱中观察到同基质晶格和粒径相关的蓝色位移(≈600cm–1)。详细介绍了Er3+和Ho3+掺杂的Y2O3纳米晶的上转换机理,由于纳米晶表面容易吸附空气中的CO2和H2O,使得上转换性能明显低于体材料。通过对其进行表面改性处理,可以大大提高发光效率。并探讨了其发展前景。

Reviewed was the recent research on rare earth doped Y2O3 nanocrystals. The preparation and luminescent properties of Y2O3:Eu3+ nanopowders were summarized. In particular, the blue shift (≈600 cm–1) related with the host lattice and grain size was noticed in the excitation spectrum when synthesized via sol-gel pyrolysis process. The upconversion mechanisms of Er3+ and Ho3+ doped nanocrystalline Y2O3 were also discussed. The upconversion efficiency of nanocrystals is obviously low as compared with that of bulk crystals, for the surface of nanocrystals readily adsorbs CO2 and H2O from the atmosphere. The chemical treatment to the surface is beneficial to improve the luminescence efficiency of Y2O3 nanocrystals. The future developments for rare earth doped Y2O3 nanocrystals are also discussed.