Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer |
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| Affiliation: | 1. Department of Physics, Bhilai Institute of Technology Raipur, New Raipur, Chhattisgarh, India;2. Department of Physics, National Institute of Technology, Raipur, Chhattisgarh, India;3. Department of Physics, Government V.Y.T.PG. Autonomous College, Durg, Chhattisgarh 91001, India;1. Division of Otolaryngology, Maxillofacial Surgery and Dentistry, Aosta Hospital, Aosta, Italy;2. Division of Ophthalmology, Aosta Hospital, Aosta, Italy;1. Computer Science Department, University of Geneva, Switzerland;2. Computer Science Department, University of Liverpool, United Kingdom;3. Computer Science Department, University of Patras, Greece;4. Computer Technology Institute and Press “Diophantus”, Greece;1. Interdisciplinary Materials Science, Vanderbilt University, Nashville, TN 37235, United States;2. Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37235, United States;3. Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, United States;1. St.Petersburg State University, Math. and Mech. Faculty, 198504, University Street 28, Petergof, St. Petersburg, Russia;2. KMA MFF UK Sokolovská 83, 18600 Praha 8, Czech Republic |
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| Abstract: | A series of white-light-emitting phosphors of single-phase Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ were synthesized by conventional solid-state reaction. The crystal structure of the host was characterized by X-ray diffraction and investigated by Rietveld refinement. Photoluminescence properties were studied in detail. The energy transfer from Ce3+ to Tb3+ in Ba2Mg(BO3)2 host was investigated and demonstrated to be a resonant type via a quadrupole–quadrupole mechanism. White light with wavelength tunable was realized by coupling the emission bands peaking at 417, 543 and 626 nm attributed to Ce3+, Tb3+ and Eu2+, respectively. By properly tuning the relative composition of Ce3+(Na+)/Tb3+/Eu2+, optimized Commission Internationale de l׳Eclairage (CIE) chromaticity coordinates (0.363, 0.295), high color rendering index (CRI) 90 and low correlated color temperature (CCT) 3793 K were obtained from the phosphor of Ba1.90Ce0.04Na0.04Eu0.02Mg0.94Tb0.06(BO3)2 upon the excitation of 296 nm UV radiation. These results indicate that Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor has a potential application as an UV radiation down-converting phosphor in white-light-emitting diodes. |
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| Keywords: | Optical materials Luminescence X-ray diffraction Phosphors |
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