FT-IR, FT-Raman and fluorescence studies of Tb³⁺ ions activated lead containing sodium fluoroborate glasses

详细信息	查看全文 | 推荐本文 |

• 作者：C. Madhukar Reddy^a ; B. Sudhakar Reddy^c ; G.R. Dillip^a ; K. Mallikarjuna^a ; B. Deva Prasad Raju^b ; ^{drdevaprasadraju@gmail.com}
• 关键词：Glasses ; FT-Raman ; Oscillator strengths ; J&ndash ; O parameters ; Fluorescence ; Lifetimes
• 刊名：Journal of Molecular Structure
• 出版年：2012
• 期刊代码：62_00222860
• 类别：ch
• 出版时间：18 July, 2012
• 卷：1019
• 期：Complete
• 页码：166-173
• 文件大小：824 K

摘要

This study reports on the concentration dependent fluorescence properties of Tb³⁺-doped lead containing calcium zinc sodium fluoroborate (LCZSFB) glasses and are analyzed by DSC, FT-IR, FT-Raman, optical absorption, emission and decay curve spectra. Co-existence of trigonal BO₃ and tetrahedral BO₄ units was evidenced by FT-IR and Raman spectroscopy. Judd-Ofelt theory was applied to the experimental oscillator strengths to evaluate the J-O intensity parameters. The fluorescence spectra of Tb³⁺-doped glasses have revealed prominent blue and green emissions originating from ⁵D₃ and ⁵D₄ excited levels to ⁷F_J ground state multiplet, respectively. The luminescent intensity of the transitions originating from ⁵D₄ state increases with increase of Tb³⁺ concentration and no quenching effect is noticed up to 2 mol%of Tb³⁺ ions. Chromaticity color coordinates have been calculated and the dominant emission in the green region is discussed. The nature of decay curves of ⁵D₄ level for different Tb³⁺ ion concentration in all LCZSFB glasses has been analyzed. Using the J-O intensity parameters as well as from the emission and decay curve measurements, various radiative and fluorescence properties have been calculated for the ⁵D₄ fluorescent level. Based on these results, the utility of Tb³⁺ ions doped LCZSFB glasses as laser active materials for high intensity emissions in the green region is discussed.