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Effect of Yb3+ concentration on photoluminescence properties of cubic Gd2O3 phosphor
Institution:1. Department of Applied Physics, Bhilai Institute of Technology (Seth Balkrishan Memorial), Near Bhilai House, Durg, C.G. 491001, India;2. School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur, C.G. 492010, India;1. School of Mathematics and Physics, Changzhou University, Jiangsu 213164, China;2. School of Electronics and Information, Nantong University, Jiangsu 226019, China;1. Department of Physics, Jnanavikas Institute of Technology, Bidadi, Bangalore 562109, India;2. Research and Development Center, Bharathiar University, Coimbatore 641046, India;3. Department of Physics, New Horizon College of Engineering, Bangalore 560103, India;4. Research Center, Department of Science, East West Institute of Technology, Bangalore 560091, India;5. Prof. C.N.R. Rao Center for Advanced Materials, Tumkur University, Tumkur 572103, India;6. Dayanand Sagar University, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore 560078, India;7. Department of Physics, Acharya Institute of Technology, Bangalore 560090, India;1. Nanomaterials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli, 620015, India;2. Division of Applied Physics, University of Tsukuba, Ibaraki, 305-8573, Japan;1. School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zi Bo, 255000, PR China;2. Department of Physics, Harbin Institute of Technology, Harbin, 150001, PR China;1. Department of Applied Physics, Bhilai Institute of Technology (Seth Balkrishan Memorial), Near Bhilai House, Durg, C.G. 491001, India;2. School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur, C.G. 492010, India;3. Department of Chemistry, Shri Shankaracharya Vidyalaya, Amdi Nagar, Hudco, 490006, India
Abstract:Yb3+ doped phosphor of Gd2O3 (Gd2O3:Yb3+) have been prepared by solid state reaction method. The structure and the particle size have been determined by X-ray powder diffraction measurements. The average particle size of the phosphor is in between 35 and 50 nm. The particle size and structure of the phosphor was further confirmed by TEM analysis. The visible and NIR luminescence spectra were recorded under the 980 nm laser excitation. The visible upconversion luminescence of Yb3+ ion was due to cooperative luminescence and the presence of rare earth impurity ions. The cooperative upconversion and NIR luminescence spectra as a function of Yb3+ ion concentration were measured and the emission intensity variation with Yb3+ ion concentration was discussed. Yb3+ energy migration quenched the cooperative luminescence of Gd2O3:Yb3+ phosphor with doping level over 5%, while the NIR emission luminescence continuously increases with increasing Yb3+ ion concentration.
Keywords:Solid state synthesis  PXRD  TEM  Cooperative upconversion
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