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Effect of the Ce3+ concentration on laser-sintered YAG ceramics for white LEDs applications
Affiliation:1. Center of Exact and Technological Science, Federal University of Recôncavo of Bahia, Cruz das Almas, BA, 44380-000, Brazil;2. Group Functional Nanomaterials, Physics Department, Federal University of Sergipe, 49100-000 São Cristóvão, SE, Brazil;3. Center for Optical Materials Science and Engineering Technologies, Clemson University, Anderson, SC, 29625, USA;4. Department of Materials Science and Engineering, Clemson University, Clemson, SC, 29634, USA;1. STC “Institute for Single Crystals”, National Academy of Sciences of Ukraine, 60, Nauky Avenue, Kharkiv, 61072, Ukraine;2. Institute of Physics Polish Academy of Sciences, Al. Lotnikow 32/46, PL-02-668, Warsaw, Poland;3. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okolna 2, 50-422, Wroclaw, Poland;4. Department of Chemistry, University College London, 20 Gordon St, London, WC1H 0AJ, UK;1. Laboratory of Micro-Nano Optoelectronic Materials and Devices, Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Shanghai Tech University, Shanghai 201210, China;4. Engineering Research Center of Optical Instrument and System, University of Shanghai for Science and Technology, No. 516 Jun Gong Road, Shanghai 200093, China;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, PR China;2. Oles Honchar Dnipropetrovsk National University, Dnipropetrovsk, Gagarin 72, Ukraine
Abstract:This paper describes the laser sintering and luminescence properties of Y3Al5O12 (YAG) phosphors doped with different concentrations of Ce3+ and synthesized using the polymeric precursor method. The ceramics were sintered by a new laser sintering technique in which a CO2 laser is employed as the heating source. The resultant ceramics exhibited a homogeneous microstructure with narrow grain size distribution and high relative density. The introduction of Ce3+ ions led to luminescence quenching at a concentration above 0.5 mol% and a redshift of the emission spectrum band with increasing cerium concentration. The excitation spectrum showed two characteristic bands centered at 340 nm and 460 nm and a relative change in their intensity by change the Ce3+ concentration. The presence of a single valence (Ce3+) of cerium was determined by X-ray absorption near edge structure measurements.
Keywords:YAG  Laser sintering  Ceramics  Photoluminescence  LED
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