Concentration dependent luminescence properties of Dy3+ doped lead free zinc phosphate glasses for visible applications
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- 作者：V. Reddy Prasad ; S. Babu ; Y. C. Ratnakaram
- 关键词：Phosphate glass ; Dysprosium ; Absorption ; Emission ; Lifetime ; Judd–Ofelt theory
- 刊名：Indian Journal of Physics
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：90
- 期：10
- 页码：1173-1182
- 全文大小：638 KB
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Astronomy
Astronomy, Astrophysics and Cosmology
Physics - 出版者：Springer India
- ISSN：0974-9845
- 卷排序：90
文摘
Dysprosium (Dy3+) doped lead free zinc phosphate glasses with chemical compositions (60 − x) NH4H2PO4 + 20ZnO + 10BaF2 + 10NaF + xDy2O3 (where x = 0.5, 1.0, 1.5, 2.0 mol%) have been prepared by melt quenching technique. The functional groups of vibrational bands have been assigned and clearly elucidated by FTIR and Raman spectral profiles for all these glass samples. Judd–Ofelt (J–O) intensity parameters (Ωλ: λ = 2, 4, 6) have been obtained from spectral intensities of different absorption bands of Dy3+ doped glasses. Radiative properties such as radiative transition probabilities (AR), radiative lifetimes (τR), branching ratios (βR) and integrated absorption cross-sections (Σ) for different excited states are calculated by using J–O parameters. Luminescence spectra exhibit three emission bands (from 4F9/2 level to 6H15/2, 6H13/2 and 6H11/2) for all the concentrations of Dy3+ ions before and after gamma irradiation. Various luminescence properties have been studied by varying the Dy3+ concentration for the three spectral profiles. Fluorescence decay curves of 4F9/2 level have been recorded. The energy transfer mechanism that leads to quenching of 4F9/2 state lifetime has been discussed by the variation of Dy3+ concentration. These glasses are expected to be useful for yellow luminescent materials.