Paper Title:

Cooperative Pair Driven Quenching of Yb3+ Emission in Nanocrystalline ZrO2:Yb3+

Periodical Journal of Nano Research (Volume 5)
Main Theme Journal of Nano Research Vol. 5
Pages 121-134
DOI 10.4028/www.scientific.net/JNanoR.5.121
Citation O. Meza et al., 2009, Journal of Nano Research, 5, 121
Online since February, 2009
Authors O. Meza, L.A. Diaz-Torres, P. Salas, E. De la Rosa, C. Ángeles-Chávez, D. Solis
Keywords Cooperative Upconversion, Nanocrystal, Ytterbium, Zirconium Oxide
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Abstract

The concentration luminescence quenching of the NIR emission of Yb3+ in nanocrystalline ZrO2 is studied. It is found that the quenching is dominated by cooperative energy transfer processes from isolated Yb3+ ions to Yb-Yb pairs (Yb dimers). The Yb dimer concentration depends on the crystallite phase and size, which on time depends on Yb concentration. An extended energy transfer model was developed to predict the IR and cooperative visible fluorescence emissions by taking in to account the crystalline phase, the nanocrystals size, and the geometrical construction of Yb dimers. Our model succeeds to fit simultaneously both experimental VIS and NIR emissions, and the corresponding interaction parameters are reported.