Correlation between structural and optical properties of Dy3+ doped BaGd2O4 phosphors intended for solid-state lighting applications期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Correlation between structural and optical properties of Dy3+ doped BaGd2O4 phosphors intended for solid-state lighting applications

Affiliation:	1. Faculty of Chemistry, Southern Federal University, Rostov-on-Don, Russia;2. Southern Scientific Center of Russian Academy of Science, Rostov-on-Don, Russia;1. School of Industrial Metallurgical Engineering of Volta Redonda, Fluminense Federal University, Volta Redonda, RJ, 27276-210, Brazil;2. Institute of Mechanical Engineering, UNIFEI-Federal University of Itajubá, Itajubá, MG, 37500-903, Brazil;3. Department of Manufacturing and Materials Engineering, School of Mechanical Engineering, University of Campinas, Campinas, SP, 13083-860, Brazil;4. Faculty of Technology, Rio de Janeiro State University, Resende, RJ, 27537-000, Brazil;5. Center for Information Technology Renato Archer, Campinas, SP, 13069-901, Brazil;1. Department of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia;2. Bernal Institute, University of Limerick, Limerick, V94 T9PX, Ireland;3. Department of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia;4. Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, 141701, Russia;5. SLS, Laboratory for Synchrotron Radiation – Condensed Matter, Paul Scherrer Institute, 5232, Villigen, Switzerland;6. Department of Materials Science, MSU-BIT University, Shenzhen, 517182, China;1. Institute of Surface/Interface Science and Technology, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China;2. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing, Beijing Institute of Aeronautical Materials, Beijing, 100095, China;1. Department of Physics, Zhejiang Normal University, Jinhua, 321004, China;2. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China;3. College of Environment, Hohai University, Nanjing, 210098, China;1. School of Materials Science and Engineering, Shanghai University, Shanghai, China;2. National Key Laboratory of Science and Technology on Underwater Acoustic Antagonizing, Shanghai, 201108, China;3. Shanghai Marine Electronic Equipment Research Institute, Shanghai, 201108, China

Abstract:	Highly crystalline and single phase BaGd $_{2 ? x}$ Dy $_{x}$ O $_{4}$ (0.00 $\leq$ x $\leq$ 0.16) phosphors, with an average crystallite size around 126 nm, have been synthesised using solid-state reaction technique. The structural and optical properties of these phosphors have been studied in detail to establish an unambiguous correlation between these properties. High-angle annular dark field (HAADF) images have confirmed that the constituent elements are homogeneously distributed in the particles, and their elemental composition has been established using X-ray photoelectron spectroscopy (XPS). The tuning of optical band gap with x has been achieved, which is a rare achievement in these phosphors. Also, the optimum concentration of Dy $^{3 +}$ ions has been found to be 0.8 mol%, which is the lowest among the Dy $^{3 +}$ doped BaGd $_{2}$ O $_{4}$ phosphors reported so far. This concentration quenching effect has been discussed on the basis of a combination of decay curve analysis, calculation of average critical distance between the Dy $^{3 +}$ ions and integrated intensities of photoluminescence (PL) emission bands. The average crystallite size and optical band gap has also been found to decrease after x = 0.016, from which their correlation with concentration quenching effect has been investigated. The asymmetry ratio between the integrated intensities of yellow and blue PL emission bands has been observed to be greater than 2 throughout x, which confirmed the preferential lattice site for Dy $^{3 +}$ ions in these phosphors with present synthesis conditions. The variation of asymmetry ratio and Gd $^{3 +}$ -dominated IR-active lattice vibrations with x, and Vegard’s law pertaining to the volume of a unit cell confirms that the local bonding environment in the lattice of these phosphors gets modified at x = 0.016. The photometric parameters for these phosphors reveal their suitability for fabrication of warm light orange LEDs on appropriate UV chips.

Keywords:	Phosphors Charge transfer band Concentration quenching Decay curve Photometric parameters
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