Y_2O_3:Er^(3+)的共沉淀法制备和pH值对发光性质的影响

Preparation of Y_2O_3:Er^(3+) by Coprecipitation Method and Influence of Initial pH on the Luminescent Properties

采用共沉淀法,通过氨水调节沉淀剂碳酸氢铵的pH值,制备了一系列Y2O3:1%Er样品。傅里叶变换红外光谱以及元素分析表明,沉淀剂pH值在8.0～9.5之间变化时,前驱沉淀物化学结构基本不变;而X射线荧光谱仪分析与SEM形貌表征的结果表明,pH值改变时不仅会导致前驱沉淀物中Er含量的变化,而且使得煅烧后粉末颗粒的粒径及其分布发生改变。测量煅烧后粉末样品的荧光光谱,结果显示,pH值变化引起的Er含量和颗粒粒径的变化,都会导致粉末样品发光性质产生差异。

Samples of Y2O3：1%Er were prepared by coprecipitation method and the pH value of precipitant ammonium bicarbonate was adjusted by ammonia.Results of Fourier transform infrared spectra（FTIR） and elemental analysis showed that the chemical construction of precursors at pH range of 8.0～9.5 had little change.By X-ray fluorescence spectrometer（XRF） and scanning electron microscope（SEM） analysis,it was found that the pH value of precipitant had a significant impact on the content of erbium in precursor and it can influence particle size as well as its distribution of the products,both of which had important effects on the luminescent properties of the products.