Luminescence performance of Eu3+-doped lead-free zinc phosphate glasses for red emission
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- 作者：Y C RATNAKARAM ; V REDDY PRASAD ; S BABU…
- 刊名：Bulletin of Materials Science
- 出版年：2016
- 出版时间：August 2016
- 年：2016
- 卷：39
- 期：4
- 页码：1065-1072
- 全文大小：1,180 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Engineering, general - 出版者：Springer India
- ISSN：0973-7669
- 卷排序：39
文摘
In this study, the luminescence performance of zinc phosphate glasses containing Eu3+ ion with the chemical compositions (60–x)NH4H2PO4-20ZnO-10BaF2-10NaF–x Eu2O3 (where x = 0.2, 0.5, 1.0 and 1.5 mol%) has been studied. These glasses were characterized by several spectroscopic techniques at room temperature. All the glasses showed relatively broad fluorescence excitation and luminescence spectra. Luminescence spectra of these glasses exhibit characteristic emission of Eu3+ ion with an intense and most prominent red emission (614 nm), which is attributed to 5D0 → 7F2 transition. Judd-Ofelt (Ω2, Ω4) parameters have been evaluated from the luminescence intensity ratios of 5D0 → 7FJ (where J = 2 and 4) to 5D0 → 7F1 transition. Using J-O parameters and excitation spectra, the radiative parameters are calculated for different Eu3+-doped glasses. Effect of γ-irradiation at fixed dose has been studied for all the Eu3+-doped glass matrices. The lifetimes of the excited level, 5D0, have been measured experimentally through decay profiles. The colour chromaticity coordinates are calculated and represented in the chromaticity diagram for Eu3+-doped zinc phosphate glasses for all concentrations.KeywordsZinc phosphate glassphonon side bandstimulated emission cross-sectionsdecay curveγ-irradiationred emission.