铌酸钾钠基透明上转换陶瓷材料制备及性能

Preparation and Performance of KNN-based Upconversion Transparent Ceramics

采用热压烧结工艺,以Li Bi O3作为烧结助剂,制备了铌酸钾钠基透明上转换陶瓷K0.5（1-y）Na0.5（1-y）LiyNb1-yBiyO3-Er0.005Yb0.005x（Er3＋/Yb3＋：KNNLB,x=0~3,y=0~0.09）。并对其微观结构、光学透光率和上转换效应等进行了研究。结果表明该透明陶瓷具有正交钙钛矿型结构,晶粒尺寸约0.5μm,致密度较高。该材料在红外区和可见光区有良好的透明性,但是随着铒镱掺杂量的增加,可见光区透光率呈明显的下降趋势。当y=0.06、x=0时,在可见光范围内透过率可达到45%（样品厚度为0.5 mm）,红外光区域透过率达到95%以上。铒镱共掺杂透明陶瓷实现了在波长900 nm氙灯光源激发下的上转换效应。

Upconversion transparent ceramics K0.5（1-y）Na0.5（1-y）LiyNb1-yBiyO3-Er0.005Yb0.005x（Er3＋/Yb3＋：KNNLB, x=0-3, y=0-0.09） were fabricated by hot-press sintering process using LiBiO3 as additives. The microstructure, optical transparency and upconversion fluorescence were investigated. The results show that the crystalline phase of the ceramics is orthorhombic-perovskite structure. The ceramics are well densified, and the grain size of the ce- ramics is about 0.5 μm. These ceramics present good transparency in the infrared and the long-wavelength visible regions, but the optical transparency declines rapidly in the visible region as the amount of Yb3＋ and Er3＋ ions in- creases. The transparency of the ceramics with y = 0.06 and x = 0 reaches 45% in the visible region and over 95% in the infrared region（the thickness of the sample is 0.5mm）. The strong upconversion fluorescence is observed when the ceramics are excited by the 900 nm-wavelength light of an xenon lamp.