Dual color emitting Eu doped strontium orthosilicate phosphors synthesized by bio-template assisted ultrasound for solid state lightning and display applications |
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| Institution: | 1. Department of Physics, Govt. First Grade College, Sira, Tumkur 572 103, India;2. Research and Development Center, Bharathiar University, Coimbatore 641 046, India;3. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India;4. Department of Physics, BMS Institute of Technology and Management, VTU-Affiliated, Bangalore 560 064, India;5. Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India;6. Department of Chemistry, University College of Science, Tumkur University Tumkur 572103, India;1. Department of Physics, Govt. Science College, Bengaluru 560 001, India;2. Department of Physics, Bangalore University, Bengaluru 560 056, India;3. Department of Physics, Acharya Institute of Graduate Studies, Bengaluru 560 107, India;4. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India;5. Department of Physics, BMS Institute of Technology and Management, VTU-affiliated, Bengaluru 560 064, India;6. Department of Mechanical Engineering, Jain University, Advisor, Jain group of Institutions, Bengaluru 560069, India;7. Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641043, India;8. Department of Printing Technology, Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641043, India;1. Sree Siddaganaga College of Arts, Science and Commerce for Women, Tumakuru 572 102, India;2. Sri Siddhartha Academy of Higher Education, Agalakote, Tumakuru 572 105, India;3. Prof. C.N.R. Rao Centre for Advanced Materials, Tumakuru University, Tumakuru 572 103, India;4. Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India;5. Department of Physics, BMS Institute of Technology and Management, VTU-affiliated, Bangalore 560 064, India;6. Department of Mechanical Engineering, Jain University, Jain Group of Institutions, Bangalore 560 069, India;7. Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641 043, India;8. Department of Computer Science and Engineering, Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641 043, India;1. Department of Physics, New Horizon College of Engineering, Bangalore 560103, India;2. Research and Development Center, Bharathiar University, Coimbatore 641046, India;3. Research Center, Department of Science, East West Institute of Technology, Bangalore 560091, India;4. Prof. CNR Rao Center for Advanced Materials, Tumkur University, Tumkur 572103, India;5. Chhattisgarh Swami Vivekananda Technical University, Bhilai (CG) 493441, India;6. Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560054, India;7. Department of Physics, Acharya Institute of Technology, Bangalore 560107, India;8. Department of Physics, Dayanand Sagar Academy of Technology and Management, Bangalore 560082, India;1. Centre for Research and Development, Department of Physics, PRIST Deemed to be University, Vallam, Thanjavur, 613403, Tamil Nadu, India;2. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India;3. Department of Chemistry, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, TX, 78539, USA;1. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur, 572 103, India;2. Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India;3. Department of Physics, B M S Institute of Technology and Management, VTU Affiliated, Bangalore 560064, India;4. Department of Mechanical Engineering, Jain University, Advisor, Jain Group of Institutions, Bangalore 560 069, India |
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| Abstract: | A novel Sr2SiO4:Eu (1–5 mol %) superstructures (SS) were synthesized using bio-sacrificial A.V. gel assisted ultrasound method. Powder X-ray diffraction patterns confirmed the presence of both α and β phase formation. It was evident that the morphological growth was highly reliant on A.V. gel concentration, sonication time, pH and sonication power. The formation mechanisms for different hierarchical SS were proposed. From diffuse reflectance spectra, the energy band gap was estimated and found to be ∼4.70–5.11 eV. The photoluminescence emission spectra for the excitation at 392 nm, shows characteristic emission peaks at 593, 613, 654 and 702 nm which were attributed to 5D0 → 7F0, 7F1, 7F2 and 7F3 transitions of Eu3+ ions respectively. Conversely, when the samples were subjected to the heat treatment at 850 °C for 3 h under argon atmosphere, display an intense broad emission peak with two de-convoluted peaks at 490 and 550 nm due to 4f65d1→4f1 (8S7/2) transitions of Eu2+ ions. The concentration quenching phenomenon was discussed which attributes to energy transfer, electron–phonon coupling and ion–ion interaction. The Judd–Ofelt intensity parameters and other radiative properties were estimated by using emission spectra. The CIE chromaticity coordinate values of Sr2SiO4:Eu2+ and Eu3+ nanophosphors were located in green and red regions respectively. The calculated CCT and CRI values specify that the present phosphor can be fairly useful for both green and red components of white LED’s. Luminescence decay and quantum yield suggest the suitability of this phosphor as an efficient luminescent medium for light emitting diodes. Overall, the results elucidated a rapid, environmentally benign, cost-effective and convenient method for Sr2SiO4:Eu3+ synthesis and for the possible applications such as solid state lighting and display devices. |
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| Keywords: | Ultrasound Nanophosphor Light emitting diodes Photoluminescence SS |
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