摘要
利用溶胶 凝胶技术制备了掺不同量Eu3+ 和不同退火温度下的SiO2 凝胶和玻璃 ,通过在不同退火温度下样品的激发光谱、发射光谱、红外光谱和差热 热重曲线 ,研究了掺Eu3+ 的SiO2 玻璃材料的结构和发光性能。结果显示 :当Eu3+ 的掺杂量大于 1 86% (质量分数 ) ,Eu3+ 的发光强度趋于稳定 ,当样品的退火温度大于 3 0 0℃时 ,SiO2 凝胶玻璃中吸附的水已基本除净 ,此时显示出Eu3+ 的特征发射光谱 ,谱带位置分别是 614 ,5 96,5 88,5 77nm ,分别归属于5 D0 -7F2 ,5 D0 -7F1 ,5 D0 -7F0 跃迁 ,对应的激发光谱显示 6个峰 ,位置分别是 3 18,3 62 ,3 80 ,3 93 ,412 ,462nm ,说明 3 0 0～ 5 0 0℃是凝胶向玻璃转变的关键温度 ,而水对Eu3+
Under different annealing temperatures, Eu 3+ doped SiO 2 gel or glass were prepared by sol gel method, and the structure and luminescent properties were studied through excitation spectra, emission spectra, IR and DTA TG. The results show that the fluorescent intensity tends to stabilize when concentration of Eu 3+ doped is above 1 86% (mass fraction) and most water absorbed by the gel is removed under 300 ℃. The emission spectra of Eu 3+ , with peaks at 614, 596 588, 577 nm, is due to 5D 0- 7F 2, 5D 0- 7F 1, 5D 0- 7F 0 transitions, and corresponding excitation spectrum peaks at 318, 362, 380, 393, 412, 462 nm, respectively. These results illustrate that conversion from gel to glass is a structural change process when temperature is under 300～500 ℃, and that the fluorescence is quenched strongly by water.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第3期205-206,共2页
Journal of the Chinese Society of Rare Earths
基金
国家重点基础研究发展规划项目资助项目! (G19980 613 11)
内蒙古自治区科委重大研究项目资助课题
内蒙古师范大学和北京大学合作
