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Sm3+ Doped Lithium Strontium Borate Glasses for Solid State Lighting Applications

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The glasses of samarium (0.1, 0.2, 0.5, 1.0, 1.5 and 2.0 mol %) doped lithium strontium borate samples were synthesized. The physical and optical properties are studied at ambient conditions and discussed in this study. XRD spectra reveals the no atomic order in structure (amorphous) present in these glasses. Infrared spectroscopic study reveals the structural units of borate viz., BO3 and BO4 group present in the matrix. Interestingly, it is found that as the rare earth concentration increases and beyond 1.5 mol % the luminescence intensity decreases due to non-bridging Sm3+ ions in the glass network. The peaks in absorption spectra are due to dipole transition from 6H5/2 to levels corresponds to (2S + 1)LJ excited states under the excitation wavelength of 402 nm. Judd–Ofelt theory applied to estimate dipole strength in terms of J–O parameters (Ω2, Ω4 and Ω6), oscillator strength (fexp and fcal), radiative transition possibility (AR), branching ratio (βR) and stimulated emission cross section (σ) of the glass samples. From Judd–Ofelt analysis the parameters obtained are shown for 1.50 mol % of Sm3+ doped lithium strontium borate (LSB) glasses studied, which were compared with other glasses. The obtained results suggest their potential candidature for using as solid state material lighting applications due their efficient orange emissions.

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ACKNOWLEDGMENTS

Dr. R. Rajaramakrishna thank Prof. Dr. J. Kaewkhao for his support the work and also thank Nakhon Pathom Rajabhat University. Mr. Venugopal thank department of PG studies and research in physics, The National College, Jayanagar, Bangalore–560 070 for providing the research facilities for synthesis of the glass and supervisor Dr. K. Rajashekara and Dr. R. Rajaramakrishna.

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Authors and Affiliations

  1. Department of Physic, B.G.S R&D Centre, SJC Institute of Technology, Chikkaballapur, Karnataka, India

    A. R. Venugopal & K. M. Rajashekara

  2. Department of PG Studies and Research in Physics, The National College, 560070, Jayanagar, Bangalore, India

    R. Rajaramakrishna & J. Abhiram

  3. Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, 73000, Nakhon Pathom, Thailand

    R. Rajaramakrishna & J. Kaewkhao

  4. Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), 560064, Jakkur, Jalahalli, Bengaluru, India

    A. R. Venugopal & Vinayak Pattar

  5. Department of Physics, Brindavan College of Engineering, 560063, Bengaluru, India

    A. R. Venugopal

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Venugopal, A.R., Rajaramakrishna, R., Abhiram, J. et al. Sm3+ Doped Lithium Strontium Borate Glasses for Solid State Lighting Applications. Glass Phys Chem 45, 472–484 (2019). https://doi.org/10.1134/S1087659620010216

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