Influence of Al3+ on the cross relaxation process and electrical properties of Dy3+ activated Gd2O3 phosphor for white LED application |
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| Affiliation: | 1. Nanomaterials laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620015, India;2. Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli 620015, India;1. Nanomaterials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India;2. Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli 620 015, India;1. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;1. Institute of Physics, Kazimierz Wielki University in Bydgoszcz, 85090 Bydgoszcz, Poland;2. Electronics Department of Ivan Franko National University of Lviv, 79070 Lviv, Ukraine;3. Department of Physics of Ivan Franko National University of Lviv, 79005 Lviv, Ukraine;4. Institute of Nuclear Physics, Polish Academy of Science, 31-342 Krakow, Poland;5. SSI Institute for Single Crystals, National Academy of Sciences of Ukraine, 61001 Kharkiv, Ukraine;6. Institute of Physics, Academy of Sciences of Czech Republic, 16253 Prague, Czech Republic;1. College of Chemistry, Jilin University, Changchun 130012, PR China;2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China;3. College of Earth Science, Jilin University, Changchun 130012, PR China |
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| Abstract: | Gd2O3:Dy3+ Al3+ phosphors is synthesised by a wet-chemical method for various concentrations of Al3+ ion. X-ray diffraction, photoluminescence and impedance spectroscopy are used to understand the physio-chemical properties of the phosphors. The emission spectra of Dy3+ ion exhibit transition peaks centred at 572 nm (yellow), 486 nm (blue) and 669 nm (red). Energy transfer from Gd3+ to Dy3+ is also verified by exciting the phosphors at 274 nm. Some of the Dy3+ ions occupy both C2 and S6 site of Gd3+ ion in Gd2O3 matrix. It is also revealed that the enhancement of Dy3+ emission is strongly correlated to the surface morphology of the phosphors. Introducing Al3+ ions in Gd2O3:Dy3+ phosphor affect the emission properties of Dy3+ ions and its influence is explored at various concentration of Al3+ ions. The energy level diagram is presented to explain the cross-relaxation process among Dy3+ ions and the energy transfer from Gd3+ to Dy3+ ion. |
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| Keywords: | Optical properties Electrical conductivity Colour |
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