Sol-gel法制备Er3+-Yb3+共掺杂Al2O3粉末光致发光特性

采用异丙醇铝Al(OC₃H₇)₃]为前驱体,溶胶-凝胶(Sol-gel)法制备Er³⁺-Yb³⁺共掺杂Al₂O₃粉末.实验结果表明:900 ℃烧结的粉末为固溶Er³⁺、Yb³⁺的γ-(Al,Er,Yb)₂O₃相和少量θ-(Al,Er,Yb)₂O₃相的混合物.Er³⁺-Yb³⁺共掺杂Al₂O₃粉末具有中心波长为1.533 μm的光致发光(PL)特性.1 mol % Er³⁺和1 mol% Yb³⁺共掺杂的Al₂O₃粉末的PL强度较1 mol % Er³⁺掺杂提高2倍,半峰宽从53 nm增加到63 nm.随泵浦功率的提高,PL强度呈线性增加后渐呈饱和趋势.

Photoluminescence Properties of Er3+-Yb3+ Co-doped Al2O3 Powders Prepared by Sol-gel Method

The Er³⁺-Yb³⁺ co-doped Al₂O₃ powders have been prepared by the sol-gel method,using alumina isopropoxide Al(OC₃H₇)₃]-derived γ-AlOOH sols with the addition of erbium nitrate Er(NO₃)₃·5H₂O] and ytterbium nitrate Yb(NO₃)₃·5H₂O]. The experimental results indicated that the mixture of γ-(Al,Er,Yb)₂O₃ and θ-(Al,Er,Yb)₂O₃ phases was obtained for the 1 mol% Er³⁺ and 1 mol% Yb³⁺ co-doped Al₂O₃ powder at the sintering temperature of 900 ℃. The photoluminescence (PL) spectra centered at 1.533 μm were observed for the 1 mol% Er³⁺ doped,and 1 mol% Er³⁺ and 1 mol% Yb³⁺ co-doped Al2O3 powders. The full widths at half maximum (FWHM) of about 53 nm was detected for the PL spectrum of the 1 mol% Er³⁺ doped Al₂O₃ powder. With the Er³⁺-Yb³⁺ co-doping,the PL intensity was increased by about a factor 2,and corresponding FWHM was also increased to 63 nm. For the 1 mol% Er³⁺ and 1 mol% Yb³⁺ co-doped Al₂O₃ powder,the PL intensity first increased linearly with the increase of the pumping power from 0.1 to 0.8 W,and then the saturation tendency was observed when the pumping power was further increased to about 0.94 W.