Grain-size effect on Cr3+ and F-centres photoluminescence in nanophase MgAl2O4 ceramics |
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| Affiliation: | 1. Laboratoire des Sciences des Procédés et des Matériaux, CNRS, Université Sorbonne Paris Nord, 93430 Villetaneuse, France;2. Laboratoire de Physique des Lasers, CNRS, Université Sorbonne Paris Nord, 93430 Villetaneuse, France;3. Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000 Nantes, France;4. Photon Science at DESY, Notkestr. 85, 22607 Hamburg, Germany;5. Institute of Physics, University of Tartu, W. Ostwald Str. 1, 50411 Tartu, Estonia;1. Laboratory for Computational Physics, Institute for Computational Science and Artificial Intelligence, Van Lang University, Ho Chi Minh City, VietNam;2. Faculty of Mechanical - Electrical and Computer Engineering, School of Technology, Van Lang University, Ho Chi Minh City, VietNam;3. Faculty of Engineering, Vietnamese-German University, Binh Duong, VietNam;4. International Training Institute for Materials Science, Hanoi University of Science and Technology, Ha Noi, VietNam;1. Key Laboratory of Advanced Structural Materials, Ministry of Education, and School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China;2. Jilin Provincial Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun 130012, China;1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK), Materials Synthesis and Processing (IEK-1), Wilhelm-Johnen-Straße, 52428 Juelich, Germany;2. RWTH Aachen University, Institute of Mineral Engineering (GHI), Aachen, Germany;3. JARA-Energy, Juelich, Germany;1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. School of Mechanical Engineering, Guilin University of Aerospace Technology, Guilin 541004, China;3. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China;1. Eskisehir Technical University, Faculty of Engineering, Department of Materials Science and Engineering, 26555, Eskisehir, Turkey;2. MDA Advanced Ceramics, Organize Sanayi Bolgesi Teknoloji Bulvari, 26250, Eskisehir, Turkey;1. Federal Institute of Santa Catarina (IFSC), Campus Criciúma, SC, Brazil;2. Department of Materials, Textiles, and Chemical Engineering, Ghent University, Ghent, Belgium;3. Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), SP, Brazil;4. Institute of Ceramic Technology (ITC), Universidad Jaume I (UJI), Campus Riu Sec, Castellón, Spain;5. Graduate Program in Materials Science and Engineering (PGMAT), Federal University of Santa Catarina (UFSC), SC, Brazil |
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| Abstract: | Photoluminescence (PL) spectroscopy of transparent MgAl2O4 spinel ceramics with grain size between 100 and 300 nm was studied at 7 K temperature in the near-IR-VUV range of spectrum with synchrotron radiation excitation. The PL spectra were composed of optical transitions from spatially different regions of the ceramics, which analysis evidenced grain size effect on the emission line-shapes and intensities. In particular, emission of impurity Cr3+ ions, being structured in the crystalline bulk, became broad-band in the grain boundary regions, which was associated with respectively strong and weak local crystalline fields. It was observed that (i) excitons and F centres transfer energy to Cr3+ and (ii) Cr(2Eg)/Cr(4T2g) and F-centres/Cr3+ PL intensity ratios underwent a linear dependence on the grain size. |
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| Keywords: | Nanophase ceramics Photoluminescence Grain size effect F-centres |
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