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+.
Reference:
Mhlongo, GH, Dhlamini, MS, Swart, HC, Ntwaeaborwa, OM and Hillie, KT. 2011. Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors. Optical Materials, vol. 33(10), pp 1495-1499
Mhlongo, G. H., Dhlamini, M., Swart, H., Ntwaeaborwa, O., & Hillie, K. (2011). Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors. http://hdl.handle.net/10204/5624
Mhlongo, Gugu H, MS Dhlamini, HC Swart, OM Ntwaeaborwa, and KT Hillie "Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors." (2011) http://hdl.handle.net/10204/5624
Mhlongo GH, Dhlamini M, Swart H, Ntwaeaborwa O, Hillie K. Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors. 2011; http://hdl.handle.net/10204/5624.
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