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Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors

✍ Scribed by G.H. Mhlongo; M.S. Dhlamini; H.C. Swart; O.M. Ntwaeaborwa; K.T. Hillie

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
566 KB
Volume
33
Category
Article
ISSN
0925-3467

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✦ Synopsis

Y 2 O 3 :Eu 3+ and ZnOÁY 2 O 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 2 O 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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