Nd^(3+)掺杂B_2O_3-Nb_2O_5-BaO-La_2O_3玻璃光谱性质的研究

Spectra properties of Nd^(3+) ion doped B_2O_3-Nb_2O_5-BaO-La_2O_3 glass

用高温熔融法制备了Nd3+(物质的量分数2%)掺杂40B2O3-(15-χ)Nb2O5-45BaO-χLa2O3玻璃,测量了样品的吸收光谱、发射光谱和差热分析(DTA)曲线。根据Nd3+光学跃起矩阵的特点,应用Judd-Ofelt理论,从吸收光谱获得了Nd3+光学跃起的强度参数。并计算了Nd3+离子的自发辐射跃迁几率、总自发辐射几率、荧光分支比、辐射能级寿命和受激发射截面。结果表明:该体系玻璃中,随着Nb2O5含量的增加和La2O3含量的减少,强度参数Ω2增大,说明材料的对称性降低;而Ω6减小,说明Nd-O键的共价性和键强增强;受激发射截面减小。DTA实验表明,随着Nb2O5含量的增加,材料的热稳定性提高。

The Nd^3＋ doped 2% 40B2O3-（15-X）NbO5-45BaO-xLa2O3 （X=10, 7. 5, 5, 2. 5, molar percent） glass was prepared by melting method. The absorption, emission spectra and DTA curves of the glass were measured. The Judd-Ofelt parameters were calculated from their emission spectra. Various spectroscopic parameters, such as the radiative transition probabilities, total radiative transition probability, radiative lifetime, branching ratios and the stimulated emission cross-sections between the metastable ^4F3/2 and terminal ^4F3/2 were obtained with the help of J-O parameters. The result showed that with the increase of Nb2Os and decrease of La2O3 content, the intensity parameters Ω2 and the thermal stability increased, while the intensity parameters Ω6 and the stimulated emission cross-sections decreased. It indicated that the symmetry of the glass host became lower, the band of Nd and O atoms became stronger and the covalency of Nd and O atoms increased. The differential thermal analysis indicated that the thermal stability of the glasses were enhanced as the Nb2O3 content increased.