Improving green emission of Tb3+ ions in BaO‐B2O3‐P2O5 glasses by means of Al3+ ions |
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| Authors: | T. Kalpana Y. Gandhi V. Sudarsan M. Piasecki V. Ravi Kumar N. Veeraiah |
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| Affiliation: | 1. Department of Physics, Acharya Nagarjuna University, A.P, India;2. Department of Physics, Kakani Venkata Ratnam College, A.P., India;3. Bhabha Atomic Research Centre, Chemistry Division, Mumbai‐400 085, India;4. Institute of Physics, Jan Dlugosz University, Czestochowa‐42‐201, Poland |
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| Abstract: | BaO‐B2O3‐P2O5 glasses doped with a fixed concentration of Tb3+ ions and varying concentrations of Al2O3 were synthesized, and the influence of the Al3+ ion concentration on the luminescence efficiency of the green emission of Tb3+ ions was investigated. The optical absorption, excitation, luminescence spectra and fluorescence decay curves of these glasses were recorded at ambient temperature. The emission spectra of terbium ions when excited at 393 nm exhibited two main groups of bands, corresponding to 5D3 → 7Fj (blue region) and 5D4 → 7Fj (green region). From these spectra, the radiative parameters, viz., spontaneous emission probability A, total emission probability AT, radiative lifetime τ and fluorescent branching ratio β, of different transitions originating from the 5D4 level of Tb3+ ions were evaluated based on the Judd‐Ofelt theory. A clear increase in the quantum efficiency and luminescence of the green emission of Tb3+ ions corresponding to 5D4 → 7F5 transition is observed with increases in the concentration of Al2O3 up to 3.0 mol%. The improvement in emission is attributed to the de‐clustering of terbium ions by Al3+ ions and also to the possible admixing of wave functions of opposite parities. Copyright © 2016 John Wiley & Sons, Ltd. |
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| Keywords: | BaO‐B2O3‐P2O5 glasses Tb3+ ions Al3+ ions green emission |
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