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Fraction of Er in the excited state as a function of incident flux at nonresonant excitation for the samples studied in this work.
Experimental data and simulation of the number of Er atoms in the excited state for sample annealed for . Solid curves account for the evolution without upconversion and a different percentage of Er coupled to the Si nanoclusters. Dashed curves included upconversion effects.
Effective excitation cross section of Er as a function of the incident flux at . The inset shows the representation of effective excitation cross section of sample annealed for as a function of the interaction radius. The characteristic distance obtained from that fitting is .
Excitable Er fraction as a function of the concentration of sensitizers (Si nanoclusters) calculated from the distance dependent interaction model developed in this work.
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