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Dependence of photoluminescence (PL) emission intensity on Eu and ZnO concentrations in Y2O3:Eu and ZnO·Y2O3:Eu nanophosphors |
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| Authors: | G.H. Mhlongo M.S. Dhlamini H.C. SwartO.M. Ntwaeaborwa K.T. Hillie |
| Affiliation: | a National Centre for Nano-structured Materials, Council for Scientific and Industrial Research, 1-Meiring Naude Road, Brummeria, PO Box 395, Pretoria 0001, South Africa b Department of Physics, University of Free State, Bloemfontein ZA9300, South Africa c Department of Physics, University of South Africa, Pretoria, South Africa |
| Abstract: | Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol-gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main emission peak at 612 nm was observed to increase with Eu3+ concentration from 0.25 to 0.75 mol% and decreased notably when the concentration was increased to 1 mol%. The decrease in the PL intensity at higher Eu3+ concentrations can be associated with concentration quenching effects. The red emission at 612 nm was shown to increase considerable when ZnO nanoparticles were incorporated in Y2O3:Eu3+ while green emission from ZnO was suppressed. The increase is attributed to energy transfer from ZnO to Eu3+. |
| Keywords: | Energy transfer Phosphors Concentration quenching effect |
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