Persistent luminescence of Eu2+ and Dy3+ doped barium aluminate (BaAl2O4:Eu2+,Dy3+) materials |
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| Affiliation: | 1. Universidade de São Paulo, Instituto de Química, C.P. 26077, CEP 05513-970, São Paulo-SP, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes 2242, Cidade Universitária, São Paulo-SP, Brazil;3. University of Turku, Department of Chemistry, FI-20014 Turku, Finland;4. Turku University Center for Materials and Surfaces (MatSurf), Turku, Finland;5. Departamento de Química da Universidade Federal de Ouro Preto, Ouro Preto, Brazil;1. Institute of Experimental Physics, University of Gdansk, Poland;2. Institute of Physics, Polish Academy od Science, Warsaw, Poland;3. Institute of Physics, N. Copernicus University, Torun, Poland;4. Institute of Experimental Physics, University of Gdansk, Poland;1. Department of Physics, RTM Nagpur University, Nagpur 440033, India;2. Department of Chemistry, Sevadal Mahila Mahavidyalaya, Nagpur 440009, India;1. Department of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea;2. Department of Physics, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur (Dt) 522502, A.P, India;3. Department of Applied Physics, Delhi Technological University, Bawana Road, New Delhi, 110 042, India;4. Department of Physics, Sri Venkateswara University, Tirupati, 517 502, A.P, India;5. Department of Physics, SIRT, Bhopal, 462041, India;6. Department of Electrical Engineering, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, 64200, Pakistan;1. Grupo de Nanomateriais Funcionais (GNF), Departamento de Física, Universidade Federal de Sergipe, Campus Universitário, 49100-000, Itabaiana, SE, Brazil;2. Coordenadoria de Física, Instituto Federal de Sergipe, 49400-000, Lagarto, SE, Brazil;3. Departamento de Física, Universidade Federal de Sergipe, Campus Universitário, 49100-000, São Cristovão, SE, Brazil;4. School of Chemical and Physical Sciences, Keele University, Keele, Staffordshire, ST5 5BG, UK;1. Department of Physics, Maulana Azad National Institute of Technology (MANIT), Bhopal, MP 462003, India;2. Department of Medical Physics, Jawaharlal Nehru Cancer Hospital and Research Centre (JNCHRC), Bhopal, MP 462001, India;1. Department of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea;2. Department of Applied Physics, Delhi Technological University, Bawana Road, New Delhi, 110 042, India;3. Department of Physics, S.V. University, Tirupati, 517 502, Andhra Pradesh, India;4. Department of Electrical Engineering, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, 64200, Pakistan |
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| Abstract: | Polycrystalline Eu2+ and Dy3+ doped barium aluminate materials, BaAl2O4:Eu2+,Dy3+, were prepared with solid state reactions at temperatures between 700 and 1500 °C. The influence of the thermal treatments on the stability, homogeneity and structure as well as to the UV-excited and persistent luminescence of the materials was investigated by X-ray powder diffraction, SEM imaging and infrared spectroscopies as well as by steady state luminescence spectroscopy and persistent luminescence decay curves, respectively. The IR spectra of the materials prepared at 250, 700, and 1500 °C follow the formation of BaAl2O4 composition whereas the X-ray powder diffraction of compounds revealed how the hexagonal structure was obtained. The morphology of the materials at high temperatures indicated important aggregation due to sintering. The luminescence decay of the quite narrow Eu2+ band at ca. 500 nm shows the presence of persistent luminescence after UV irradiation. The dopant (Eu2+) and co-dopant (Dy3+) concentrations affect the crystallinity and luminescence properties of the materials. |
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