Emission characteristics of Dy3+ ions in lead antimony borate glasses |
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Authors: | M Chandra Shekhar Reddy B Appa Rao M G Brik A Prabhakar Reddy P Raghava Rao C K Jayasankar N Veeraiah |
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Institution: | 1. Department of Physics, PRRM Engineering College, Shabad, Hyderabad, 509 217, India 2. Department of Physics, Osmania University, Hyderabad, 500 007, India 3. Institute of Physics, University of Tartu, Riia 142, Tartu, 51014, Estonia 4. Dept. Physics, Acharya Nagarjuna University, Nuzvid Campus, Nuzvid, 521201, A.P., India 5. Department of Physics, S.V. University, Thirupathi, 517 502, India
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Abstract: | Glasses with the composition 30PbO–25Sb2O3–(45?x)B2O3–xDy2O3 for x=0 to 1 were prepared in steps of 0.2 by the melt-quenching method. Various physical parameters, viz., density, molar volume, and oxygen packing density, were evaluated. Optical absorption and luminescence spectra of all the glasses were recorded at room temperature. From the observed absorption edges optical band gap, the Urbach energies are calculated; the optical band gap is found to decrease with the concentration of Dy2O3. The Judd–Ofelt theory was applied to characterize the absorption and luminescence spectra of Dy3+ ions in these glasses. Following the luminescence spectra, various radiative properties, like transition probability A, branching ratio β and the radiative life time τ for different emission levels of Dy3+ ions, have been evaluated. The radiative lifetime for the 4F9/2 multiplet has also been evaluated from the recorded life time decay curves, and the quantum efficiencies were estimated for all the glasses. The quantum efficiency is found to increase with the concentration of Dy2O3. |
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