Department of Physics, Pondicherry University, Puducherry 605 014, India.
Department of Physics, Yogi Vemana University, Kadapa 516 003, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Mar 25;122:422-7. doi: 10.1016/j.saa.2013.11.051. Epub 2013 Nov 21.
Glasses with compositions of (100-x) (Bi2ZnOB2O6) -x Nd2O3 (where x=0.1, 0.3, 0.5, 1 and 2 mol%) were prepared by melt quenching method and characterized through optical absorption, emission and decay curve measurements. Optical absorption spectra have been analyzed using Judd-Ofelt theory. The emission spectra exhibit three peaks at 919, 1063 and 1337 nm corresponding to (4)F3/2 to (4)I9/2, (4)I11/2 and (4)I13/2 transitions in the near infrared region. The emission intensity of the (4)F3/2 to (4)I11/2 transition increases with increase of Nd(3+) concentration up to 1 mol% and then concentration quenching is observed for 2 mol% of Nd(3+) concentration. The lifetimes for the (4)F3/2 level are found to decrease with increase in Nd2O3 concentration in the glasses. The decay curves of the glass up to 0.3 mol% of Nd(3+) exhibit single exponential nature and thereafter the curves become nonexponential nature (0.5, 1 and 2 mol%). The nonexponential curve has been fitted to the Inokuti-Hirayama model to understand the nature of energy transfer process.
用熔融淬火法制备了组成分别为(100-x)(Bi2ZnOB2O6)-xNd2O3(x=0.1,0.3,0.5,1 和 2 mol%)的玻璃，并通过光学吸收、发射和衰减曲线测量对其进行了表征。利用 Judd-Ofelt 理论分析了吸收光谱。发射光谱在近红外区域显示三个峰，分别对应于(4)F3/2到(4)I9/2、(4)I11/2和(4)I13/2跃迁的 919、1063 和 1337nm。(4)F3/2到(4)I11/2跃迁的发射强度随 Nd(3+)浓度的增加而增加，在 1 mol%的 Nd(3+)浓度下达到最大值，然后在 2 mol%的 Nd(3+)浓度下观察到浓度猝灭。发现(4)F3/2能级的寿命随玻璃中 Nd2O3浓度的增加而减小。在 0.3 mol%的 Nd(3+)以下，玻璃的衰减曲线呈现单指数性质，此后曲线呈现非指数性质(0.5、1 和 2 mol%)。非指数曲线已用 Inokuti-Hirayama 模型拟合，以了解能量转移过程的性质。
