节点文献
Tm3+/Yb3+共掺杂铋锗铅玻璃的上转换发光研究
Study on the upconversion of Tm3+ and Yb3+ codoped in bismuth-germanium-lead glass
【摘要】 设计并制备了一种组分为45Bi2O3-35GeO2-20PbO-0.02Tm2O3-xYb2O3(x=1.0,1.2,1.4, 1.6和2.0 mol%)新型Tm3+/Yb3+共掺的铋锗铅玻璃材料,测量了玻璃的吸收光谱和上转换光谱,分析了玻璃中Tm3+的上转换发光机理。应用Judd-Ofelt理论计算了铋锗铅玻璃BGP1.0中Tm3+离子的三个强度参量Ωt(t=2,4,6)、振子强度、自发跃迁辐射几率和荧光分支比等光谱参数。通过975 nm的激光二极管激发,在室温下同时观察到强烈的上转换蓝光(476 nm)和微弱的红光(653 nm),分别是由于Tm3+离子1G4→3H6和1G4→3F4跃迁。同时研究了蓝光和红光上转换发光强度随泵浦激发功率的变化,其曲线斜率分别为2.87和2.41,表明蓝光和红光都是三光子吸收过程。研究结果显示, Tm3+/Yb3+共掺铋锗铅玻璃是一种上转换蓝光激光器的潜在基质材料。
【Abstract】 Novel Tm3+ and Yb3+ codoped bismuth-germanium-lead glass was fabricated and characterized; the glass sample components are 45Bi2O3-35GeO2-20PbO-0.02Tm2O3-xYb2O3 (x=1.0,1.2,1.4,1.6 and 2.0 mol%). The absorption and upconversion spectra of Tm3+ and Yb3+ codoped in bismuth-germanium-lead glass were investigated, and upconversion mechanisms of Tm3+ in the glass were analyzed. The Judd-Ofelt intensity parametersΩt(t = 2, 4,6), oscillator strengths, spontaneous transition probability and fluorescence branching ratio of each levels for Tm3+ were calculated by Judd-Ofelt theory. Intense blue and weak red emissions centered at 476 and 653 nm, correspongding to the transitions 1G4→3H6 and 1G4→3F4, respectively, were simultaneously observed at room temperature under 975 nm diode laser excitation. The upconversion emission intensity varies with the power of infrared excitation intensity. A plot of log IUP vs log IIR yields a straight line with slope 2.87 and 2.41, corresponding to the 476 and 653 nm emission bands, respectively, which indicates a three-photon process for the blue and red emissions. The results suggest that Tm3+ and Yb3+ codoped bismuth-germanium-lead glass may be a potential host material for upconversion blue lasers.
【Key words】 spectroscopy; bismuth-germanium-lead glass; Judd-Ofelt theory; spectroscopic properties; upconversion;
- 【文献出处】 量子电子学报 ,Chinese Journal of Quantum Electronics , 编辑部邮箱 ,2007年02期
- 【分类号】TQ171.1
- 【被引频次】3
- 【下载频次】231