Department of Physics, Acharya Nagarjuna University, Nuzvid Campus, Nuzvid 521201, AP, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Oct 15;81(1):498-503. doi: 10.1016/j.saa.2011.06.043. Epub 2011 Jun 25.
Li(2)O-ZrO(2)-SiO(2):Nd(3+) glasses mixed with Nb(2)O(5), Ta(2)O(5) and La(2)O(3) were prepared. Optical absorption and photoluminescence spectra of these glasses have been recorded at room temperature. The Judd-Ofelt theory was successfully applied to characterize Nd(3+) spectra of all the three glasses. From this theory, various radiative properties like transition probability A, branching ratio β(r), the radiative lifetime τ(r), for (4)F(3/2) emission level in the spectra of these glasses has been evaluated. The radiative life time for (4)F(3/2) level of Nd(3+) ions has also been measured and quantum efficiencies were estimated. Among the three glasses studied, the La(2)O(3) mixed glass has exhibited the highest quantum efficiency. The reasons for such higher value have been discussed based on the relationship between the structural modifications taking place around the Nd(3+) ions.
Li(2)O-ZrO(2)-SiO(2):Nd(3+) 玻璃中混入了 Nb(2)O(5)、Ta(2)O(5)和 La(2)O(3)。在室温下记录了这些玻璃的光学吸收和光致发光光谱。成功地应用了 Judd-Ofelt 理论来表征所有三种玻璃中 Nd(3+)的光谱。根据该理论，评估了光谱中 (4)F(3/2)发射能级的各种辐射性质，如跃迁概率 A、分支比 β(r)、辐射寿命 τ(r)。还测量了 Nd(3+)离子的 (4)F(3/2)能级的辐射寿命，并估算了量子效率。在所研究的三种玻璃中，La(2)O(3)混合玻璃表现出最高的量子效率。基于 Nd(3+)离子周围发生的结构变化之间的关系，讨论了这种更高值的原因。
