Synthesis and characterization of BaAl2O4:Eu co-doped with different rare earth ions |
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Authors: | MA Lephoto OM Ntwaeaborwa Shreyas S Pitale HC Swart JR Botha BM Mothudi |
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Institution: | 1. Department of Physics, University of the Free State, Private bag X 13, Phuthaditjaba 9866, P.O. Box 339, Bloemfontein, ZA 9300, South Africa;2. Department of Physics, Nelson Mandela Metropolitan University, Port Elizabeth, ZA 6031, South Africa;3. Department of Physics, University of South Africa, P.O Box 392, Pretoria, ZA 6031, South Africa |
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Abstract: | Combustion method was used in this study to prepare BaAl2O4:Eu2+ phosphors co-doped with different trivalent rare-earths (Re3+=Dy3+, Nd3+, Gd3+, Sm3+, Ce3+, Er3+, Pr3+ and Tb3+) ions at an initiating temperature of 600 °C. The phosphors were annealed at 1000 °C for 3 h. As confirmed from the X-ray diffraction (XRD) data, both as prepared and post annealed samples crystallized in the well known hexagonal structure of BaAl2O4. All samples exhibited bluish-green emission associated with the 4f65d1→4f7 transitions of Eu2+ at ∼500 nm. Although the highest intensity was observed from Er3+ co-doping, the longest afterglow (due to trapping and detrapping of charge carriers) was observed from Nd3+ followed by Dy3+ co-doping. The traps responsible for the long afterglow were studied using thermoluminescence (TL) spectroscopy. |
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Keywords: | Combustion synthesis Phosphors Photoluminescence Thermoluminescence |
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