Azeem P Abdul, Balaji S, Reddy R R
Department of Physics, Vellore Institute of Technology, Vellore 632014, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Jan;69(1):183-8. doi: 10.1016/j.saa.2007.03.028. Epub 2007 Mar 24.
This paper reports the optical properties of Dy(3+) in sodium fluoroborate glasses of the type XNaF.(89-X)B(2)O(3).10 Al(2)O(3).1Dy(2)O(3) (where X=8, 12, 16, 20 and 24). Judd-Ofelt intensity parameters (Omega(2), Omega(4), Omega(6)) are derived from the absorption spectra. The Judd-Ofelt theory has been applied to interpret the local environment of Dy(3+) ions and bond covalency of RE-O bond. These parameters have been used to calculate radiative transition probabilities (A(rad)), lifetimes (tau(R)) and branching ratios (beta(R)) for the excited level (4)F(9/2). The predicted values of tau(R) are compared with the measured values for (4)F(9/2) level for five glass compositions (Glass (A-E)). The stimulated emission cross-section sigma(lambda(P)) are also evaluated for the (4)F(9/2)-->(6)H(J) (J=11/2, 13/2, and 15/2) transitions.
本文报道了XNaF.(89 - X)B₂O₃.10Al₂O₃.1Dy₂O₃（其中X = 8、12、16、20和24）类型的氟硼酸钠玻璃中Dy(³⁺)的光学性质。从吸收光谱中推导了贾德 - 奥费尔特强度参数（Ω₂、Ω₄、Ω₆）。已应用贾德 - 奥费尔特理论来解释Dy(³⁺)离子的局部环境和稀土 - 氧键的键共价性。这些参数已用于计算激发态⁴F₉/₂的辐射跃迁概率（A(rad)）、寿命（τ(R)）和分支比（β(R)）。将τ(R)的预测值与五种玻璃成分（玻璃（A - E））的⁴F₉/₂能级的测量值进行了比较。还评估了⁴F₉/₂→⁶H(J)（J = 11/2、13/2和15/2）跃迁的受激发射截面σ(λ(P))。
