Y_2O_3:Eu,Tb纳米荧光粉的制备与发光性能

Preparation and Luminescent Properties of Y_2O_3:Eu,Tb Nanopowders

以氧化钇、氧化铕、氧化铽、硝酸、柠檬酸等为原料,采用溶胶凝胶法制备Y_2O_3:Eu,Tb荧光粉体。通过X射线衍射分析(XRD)研究前驱体煅烧产物随温度变化的过程,用透射电镜(TEM)观察粉体的显微形貌,使用荧光光谱仪分析样品的激发和发射光谱。结果表明,1100℃煅烧3h可以得到结晶良好的纳米粉体,颗粒呈不规则形状,粒径分布在30~100nm之间。Y_(2(1-x))O_3:Tb_(2x)的粉体具有良好的发光性能,最佳掺杂浓度为1.0mol%。Y1.98-2xO_3:Eu0.02,Tb_(2x)粉体的发光同时表现出Eu^(3+)和Tb^(3+)的发光特征,两种离子之间存在能量传递,当Tb^(3+)离子用量大于1.0mol%时,出现浓度猝灭。

Y_2O_3:Eu,Tb nano-powders were prepared by a sol-gel method. The phase composition was studied by X-ray diffraction. The crystal structures of the powders were measured by FTIR. The microtopography of the powders was observed by transmission electron microscopy. The luminescence properties of Y_2O_3:Tb and Y2O3:Eu,Tb powders were mesured by fluorescence spetrophotometer. The results indicate that yttria crystals can be synthesized by calcining the precursor above 700 oC for 3 h. The particle size distribution of the powders heat-treated at 1100 oC ranges between 30 and 100 nm. The microtopography of the first particles is irregular. Y_2O_3:Tb powders have strong luminescence property and the suitable concentration of Tb^(3+) ion is 1.0 mol%. Y_2O_3:Eu, Tb powders possess the characteristic both of Tb^(3+) and Eu^(3+) ions. The energy can be transferred from Tb^(3+) to Eu^(3+) ions. When the concentration of Tb^(3+) ions is above 1.0 mol%, the luminescent intensity of Y2O3:Eu,Tb powders decreases dramatically.