Abstract

The glasses of samarium (0.1, 0.2, 0.5, 1.0, 1.5 and 2.0 mol %) doped lithium strontium borate samples were synthesized. The physical and optical properties are studied at ambient conditions and discussed in this study. XRD spectra reveals the no atomic order in structure (amorphous) present in these glasses. Infrared spectroscopic study reveals the structural units of borate viz., BO₃ and BO₄ group present in the matrix. Interestingly, it is found that as the rare earth concentration increases and beyond 1.5 mol % the luminescence intensity decreases due to non-bridging Sm³⁺ ions in the glass network. The peaks in absorption spectra are due to dipole transition from ⁶H_5/2 to levels corresponds to ^{(2S + 1)}L_J excited states under the excitation wavelength of 402 nm. Judd–Ofelt theory applied to estimate dipole strength in terms of J–O parameters (Ω₂, Ω₄ and Ω₆), oscillator strength (f_exp and f_cal), radiative transition possibility (A_R), branching ratio (β_R) and stimulated emission cross section (σ) of the glass samples. From Judd–Ofelt analysis the parameters obtained are shown for 1.50 mol % of Sm³⁺ doped lithium strontium borate (LSB) glasses studied, which were compared with other glasses. The obtained results suggest their potential candidature for using as solid state material lighting applications due their efficient orange emissions.

中文翻译：

---

用于固态照明应用的Sm 3+掺杂的硼酸锂锶玻璃

摘要

合成了（（0.1、0.2、0.5、1.0、1.5和2.0 mol％）掺杂的硼酸锂锶玻璃。在环境条件下研究了物理和光学性质，并在此研究中进行了讨论。XRD光谱揭示了这些玻璃中无原子序的结构（非晶态）。红外光谱研究揭示了基质中存在的硼酸盐即BO ₃和BO ₄基团的结构单元。有趣的是，发现随着稀土浓度增加并且超过1.5mol％，由于玻璃网络中的Sm ³⁺离子未桥接，发光强度降低。吸收光谱中的峰是由于偶极子从⁶ H _5/2跃迁到对应于在402 nm的激发波长下^{（2S +1）} L _J激发态。Judd-Ofelt理论应用于的J-O参数术语（Ω估计偶极强度₂，Ω ₄和Ω ₆），振子强度（˚F _EXP和˚F _CAL），辐射跃迁可能性（甲_{- [R} ），分支比（β _{- [R}）和玻璃样品的受激发射截面（σ）。根据Judd–Ofelt分析，得出的参数为1.50 mol％的Sm ³⁺研究了掺硼酸锶锶玻璃（LSB），并与其他玻璃进行了比较。所获得的结果表明，由于其有效的橙色发射，它们可能用作固态材料照明应用。