Er3+掺杂SiO2复合的Al2O3粉末结构及光致发光特性

采用溶胶-凝胶(sol-gel)工艺制备0.1 mol% Er³⁺掺杂Al₂O₃体系和SiO₂-Al₂O₃复合体系粉末. 实验结果表明：5 mol%的SiO₂复合加入Al₂O₃抑制γ→θ和θ→α相转变. 掺0.1 mol%Er³⁺:Al₂O₃体系粉末，900℃烧结，在1.47—1.63μm波段内光致发光(PL)谱为中心波长1.53 μm、半高宽56 nm的单一宽峰，1000—1200℃烧结，劈裂为多峰PL谱. 掺0.1 mol%Er³⁺:SiO₂-Al₂O₃复合体系粉末，在高达1200℃烧结，仍保持中心波长1.53 μm的单一宽峰PL谱，由于—OH更完全的脱除，PL强度较900℃烧结Al₂O₃体系，SiO₂-Al₂O₃复合体系均提高1个数量级. 关键词： 2-Al₂O₃复合体系')" href="#">SiO₂-Al₂O₃复合体系 掺铒 溶胶-凝胶工艺 光致发光

Structure and photoluminescence of Er3+-doped Al2O3 composite powders by mixing with SiO2

The 0.1 mol% Er³⁺-doped Al₂O₃ and SiO₂-Al₂O₃ powders have been prepared by the sol-gel method. The results show that the addition of 5 mol% SiO₂ into the Er³⁺-doped Al₂O₃ suppresses the phase transitions of γ→θ and θ→α. For the 0.1 mol% Er³⁺-doped Al₂O₃ powders at the sintered at temperature of 900℃, the broadband photoluminescence (PL) spectrum centered at 1.53 μm in the range from 1.47 μm to 1.63 μm was obtained with the full width at half maximum of 56 nm, and the splitted PL spectra appeared for powders sintered at 1000—1200℃. For the 0.1 mol% Er³⁺-doped Al₂O₃-SiO₂ powders, the PL spectrum has a single broadband centered at 1.53 μm even when the sintering temperature is as high as 1200℃, and the PL intensity increases by one order of magnitude, because—OH group in the Al₂O₃-SiO₂ powders has been removed completely, compared with that in the Al₂O₃ powders with and without mixing of SiO₂ sintered at the temperature of 900℃.