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Role of Yb3+ and Er3+ concentration on the tunability of green-yellow-red upconversion emission of codoped ZrO2:Yb3+Er3+ nanocrystals

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6 Author(s)
Solis, D. ; Centro de Investigaciones en Optica, A.P. 1-948, León Gto. 37160, Mexico ; De la Rosa, E. ; Meza, O. ; Diaz-Torres, L.A.
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Strong green and red visible emissions were obtained from ZrO2:Yb3+Er3+ nanocrystals synthesized by sol-gel method and annealed at 1000 °C for 5 h. The average crystallite size was ∼70 nm with tetragonal phase for total concentration lower than 3 mol % and cubic phase for concentration higher than 5 mol %. The color coordinate of the upconverted signal was tailored by controlling the dopant composition that change the red/green ratio dominated by the cross relaxation and energy back transfer process as was demonstrated theoretically and confirmed experimentally. Both coefficients were calculated, C51∼1.02×10-16 and C5b∼6.04×10-17, from the theoretical model based on the rate equations. The highest energy transfer efficiency was η∼64% for 2 mol % of Yb and 2 mol % of Er3+. However, for the highest upconverted signal was only η∼29% obtained for 2 mol % Yb and 1 mol % Er with effective decay time τeff∼438 μs for red and τeff∼290 μs for green band.

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Journal of Applied Physics  (Volume:108 ,  Issue: 2 )