Driving the photoluminescent and structural properties of X2-Y2SiO5 by varying the dopant Dy3+ concentration towards cool WLED applications |
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| Institution: | 1. Department of Physics, University College of Science, Tumkur University, Tumkur 572 103, India;2. Prof C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India;3. ARC Centre for Antimatter-Matter Studies, School of Physics, University of Western Australia, Crawley, WA 6009, Australia;4. School of Physics, REVA University, Yelahanka, Bangalore 560064, India;1. Kazan E. K. Zavoisky Physical-Technical Institute (KPhTI) of the Kazan Scientific Center of the Russian Academy of Sciences, Sibirsky tract, 10/7, Kazan 420029, Russia;2. Kazan (Volga Region) Federal University, Kremlevskaya st., 18, Kazan 420008 Russia;3. Prokhorov General Physics Institute of the Russian Academy of Sciences (GPI RAS), Vavilov Str., 38 Moscow 119991 Russia;1. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India;2. Department of Physics, Government First Grade College, Tumkur 572 103, India;3. Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India;4. Department of Mechanical Engineering Jain University, Advisor, Jain Group of Institutions, Bangalore 560069, India;5. Advisor, Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641 043, India;6. School of Physics, Reva University, Bangalore 560064, India;7. Department of Physics, BMS Institute of Technology and Management, VTU-affiliated, Bangalore 560 064, India;8. Center for Antimatter Matter Studies, Centre for Atomic, Molecular and Surface Physics, School of Physics, University of Western Australia, Perth WA-6009, Australia;1. Department of Physics, University College of Science, Tumkur University, Tumkur 572103, India;2. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India;3. Department of Physics, BMS Institute of Technology and Management, VTU Affiliation, Bangalore 560064, India;4. Department of Physics, Lal Bahadur Shastry Government First Grade College, Bangalore 560032, India;5. Dayananda Sagar University, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore 560078, Karnataka, India;6. Department of Chemistry, Dayananda Sagar College of Engineering, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore 560078, Karnataka, India;7. Department of Science, Research Center, East West Institute of Technology, Bangalore 560091, India;8. Department of Physics, JSS Academy of Technical Education, Bangalore 560060, India |
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| Abstract: | Dy3+ doped Y2SiO5 nanophosphors were synthesized by solution combustion technique using Calotropis gigantean milk latex and NaCl as fuel and flux respectively. Powder X-ray diffraction (PXRD) confirmed the formation of monoclinic X2-phase Y2SiO5 belonging to the phase group C2/c. Fourier transform infrared spectroscopy (FTIR) shows characteristic metal–oxygen (Y–O) vibration band at 721 cm−1. Transmission electron microscopic (TEM) and Scanning electron microscopic (SEM) morphological feature exhibits non-uniform almost spherical shaped nanosized particles. The photoluminescence (PL) emission peaks, recorded at 388 nm, showed radiative emissions at 483, 575 and 636 nm respectively. Judd–Ofelt (JO) analysis was carried out to estimate the radiative (AR) properties, radiative life time (τR), branching ratio (βR) and stimulated emission crossection (σλp). The CIE and CCT was estimated using McCamy empirical formula. In the beginning, the CIE co-ordinate values were lying in the light blue region. However, with increase in Dy3+ concentration the values shifted towards white region. CCT value was found to be ∼6984 K. Therefore, Y2SiO5:Dy3+ (9 mol%) can be used for cool day light and WLED applications. |
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| Keywords: | Inorganic material Nanophosphor Combustion method Photoluminescence |
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