Abstract
Y 2O 3:Eu 3+ and ZnO·Y 2O 3:Eu 3+ nanophosphor powders with different concentrations of Eu 3+ ions were synthesized by a sol–gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu 3+ ions with the main emission peak at 612 nm was observed to increase with Eu 3+ 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 Eu 3+ 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 Y 2O 3:Eu 3+ while green emission from ZnO was suppressed. The increase is attributed to energy transfer from ZnO to Eu 3+.
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