Influence of modifier oxide on Spectroscopic properties of Ho³⁺: V⁴⁺ co-doped Na₂O-SiO₂-ZrO₂ glasses

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• 作者：K. Neeraja ; T.G.V.M. Rao ; A. Rupesh Kumar ; N. Veeraiah ; M. Rami Reddy
• 关键词：Na2O&ndash ; SiO2&ndash ; ZrO2 glasses ; Holmium and vanadyl ions ; Luminescence emission ; Energy transfer
• 刊名：Journal of Alloys and Compounds
• 出版年：15 February, 2014
• 年：2014
• 卷：586
• 期：Complete
• 页码：159-168
• 全文大小：2286 K

文摘

Na₂O-SiO₂-ZrO₂ glasses co-doped with variable concentrations of Ho³⁺: V⁴⁺ have been synthesized, characterized by different techniques and finally their luminescence characteristics were investigated. The EDS spectra of the glass samples indicate all the elements are intact in the final composition of prepared glass. The infrared and Raman spectral studies are carried out and the existence of conventional structural units are analyzed. The ESR and optical absorption spectra indicated that a considerable proportion of vanadium ions do exist in V⁴⁺ state in addition to V⁵⁺ state. The absorption and emission spectra of Ho³⁺ ions were characterized using J-O theory. The radiative transition probabilities and branching ratio were evaluated from luminescence spectra. The analysis these results indicated the highest values of radiative probabilities and branching ratios for the green emission transition viz., ⁵S₂ 鈫?#xA0;⁵I₈ transition among various other transitions of Ho³⁺ ions. However, the presence of higher concentration of V₂O₅ in the glass matrix seems to be a hindrance for getting the high luminescence efficiency especially in the red region.