Nanotech 2010

Effects of Non-radiative energy transfer processes on the visible upconversion in ZrO2:Yb3+/Er3+ nanocrystals

O. Meza, L.A. Diaz-Torres, P. Salas, E. De la Rosa, C.D. Solis
Centro de Investigaciones en Optica A C, MX

Keywords: upconversion, nanocrystals, Ytterbium, Erbium, Zirconium Oxide


The luminescence dynamics of both near infrared (NIR) and visible (VIS) emission of Yb3+,Er3+ in nanocrystalline ZrO2 is studied. It is found that upconversion emission is dominated by back transfer processes over direct Yb to Er energy transfer processes. A microscopic rate equation model was developed to fit both NIR and VIS fluorescence decay trends simultaneously, and to quantify the different interaction parameters responsible of the involved energy transfer processes. The microscopic model takes into account the crystalline phase as well as the size of nanocrystals.
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