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Luminescence performance of Eu3+-doped lead-free zinc phosphate glasses for red emission

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Abstract

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.

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Acknowledgements

S Babu would like to thank the University Grants Commission, New Delhi, for the sanction of Senior Research Fellow under Research Fellowship in Sciences for Meritorious Students scheme. V Reddy Prasad expresses his thanks to University Grants Commission, New Delhi, for the sanction of JRF under Rajiv Gandhi National Fellowship.

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Authors and Affiliations

  1. Department of Physics, Sri Venkateswara University, Tirupati, 517502, India

    Y C RATNAKARAM, V REDDY PRASAD & S BABU

  2. Department of Physics, Pondicherry University, Pondicherry, 605 014, India

    V V RAVI KANTH KUMAR

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  1. Y C RATNAKARAM
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  2. V REDDY PRASAD
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  3. S BABU
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  4. V V RAVI KANTH KUMAR
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Correspondence to Y C RATNAKARAM.

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RATNAKARAM, Y.C., PRASAD, V.R., BABU, S. et al. Luminescence performance of Eu3+-doped lead-free zinc phosphate glasses for red emission. Bull Mater Sci 39, 1065–1072 (2016). https://doi.org/10.1007/s12034-016-1249-0

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  • DOI: https://doi.org/10.1007/s12034-016-1249-0

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