Microstructure and photoluminescence properties of laser sintered YAG:Ce phosphor ceramics |
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| Affiliation: | 1. Department of Chemistry, University of Turku, FI-20014 Turku, Finland;2. Doctoral Programme in Physical and Chemical Sciences, University of Turku Graduate School (UTUGS), Turku, Finland;3. Instituto de Química, Universidade de São Paulo, BR-05508-000 São Paulo, SP, Brazil;4. Physics Department, Pontifícia Universidade Católica do Rio de Janeiro, BR-22451-900, Rio de Janeiro, RJ, Brazil;5. Mackgraphe-Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, BR-01302-907, São Paulo SP, Brazil;6. Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland;7. Department of Physics, University of the Free State, Bloemfontein ZA-9300, Republic of South Africa;8. Turku University Centre for Materials and Surfaces (MatSurf), FI-20014 Turku, Finland;1. Faculty of Materials Engineering and Environment, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania;2. “Raluca Ripan” Institute for Research in Chemistry, Babes-Bolyai University, 400294 Cluj-Napoca, Romania;3. Electronic Microscopy Centre, Babes-Bolyai University, 400028 Cluj-Napoca, Romania;4. National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania;1. Key Laboratory of Transparent Opto-Functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Shanghai Institute of Technology, Shanghai 2010418, China;1. School of Physics and Electronic Information, Henan Polytechnic University, Jiaozuo,454000, China;2. Kazuo Inamori School of Engineering, Alfred University, Alfred, NY, 14802, United States;3. Glass Coatings and Concepts LLC, Monroe, OH, 45069, United States;4. School of Physics and Technology, Wuhan University, Wuhan, 430071, China;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, PR China;2. Institute of Functional Materials, Donghua University, Shanghai 201620, PR China;3. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jindezhen 333000, PR China |
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| Abstract: | Cerium-doped yttrium aluminum garnet (YAG:Ce) phosphor ceramics were fabricated by CO2 laser sintering under various powers. X-ray diffraction results indicated that all samples crystallized as a YAG phase without any impurity phase in the power range of 15–40 W. The reaction profile caused by laser ablation increased from 0.28 mm (15 W) to 2.68 mm (40 W), and it appeared deeper in the scanning sequence because of the low rigidity of YAG melts compared with solid precursors. Photoluminescence (PL) measurements revealed that the YAG:Ce sample by 15 W laser sintering upon blue light excitation presented more intense yellow emission (enhancement of 54%) as compared with YAG:Ce by solid-state reaction (SSR, 1500 °C). The laser beams were believed to distribute activators (Ce) more homogeneously compared with SSR. Additionally, a rougher surface of YAG:Ce phosphor ceramics with periodic holes caused by laser ablation resulted in more excitation and emissivity of PL. |
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| Keywords: | Laser Sintering Phosphor Yttrium aluminum garnet Light emitting diode |
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