铋离子掺杂纳米Y_2O_3∶Eu^(3+)红色荧光粉的光学性能研究

Luminescence Properties of Bi^(3+)-Doped Y_2O_3∶Eu^(3+) Red Nanophosphors

采用水热法结合高温烧结处理制备Bi^(3+)掺杂Y_2O_3∶Eu^(3+)纳米荧光粉,并考察了掺杂Bi^(3+)对Y_2O_3∶Eu^(3+)荧光粉结构、紫外可见光吸收和发光性能的影响。X射线粉末衍射测试表明,Y_2O_3∶Eu^(3+)掺杂Bi^(3+)(摩尔分数3%)后保持纯立方相结构,纳米颗粒的平均粒径约为16.8nm。通过激发和发光光谱测试,讨论了Bi^(3+)对Eu^(3+)的敏化作用,发现Bi^(3+)离子能促进Y_2O_3∶Eu^(3+)于300~400nm的近紫外光吸收,再以能量转移的方式传给Eu^(3+)。因此,利用Bi^(3+)电荷迁移带的近紫外吸收,是实现近紫外光有效激发Y_2O_3∶Eu^(3+)荧光粉的一种重要途径。

Bi^(3+)doped Y_2O_3 ∶Eu^(3+)nanophosphors were prepared by the hydrothermal method combined with high temperature sintering treatment. X-ray diffraction(XRD), UV-Vis diffuse reflectance spectroscopy(UV-Vis)and photoluminescence spectroscopy(PL)were used to characterize the effect of doping Bi^(3+)on the structure,optical absorption and luminescence performance of Y_2O_3∶Eu^(3+)powders.XRD results indicate that Bi^(3+)doped Y_2O_3∶Eu^(3+)powders still maintain the cubic structure of Y_2O_3 and the average size of nanoparticles is about 16.8 nm.The effect of Bi^(3+)on the sensitization of Eu^(3+)were observed and discussed by studying the excitation and emission spectra.It is found that Bi^(3+)ions can promote the energy absorption between 300 and 400 nm of Y_2O_3∶Eu^(3+),leading to the energy transfer from Bi^(3+)to Eu^(3+)ions.Therefore,adding Bi^(3+)is an important method to achieve effective excitation of Y_2O_3∶Eu^(3+)nanophosphors by near ultraviolet light.