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Abstract
Luminescence spectra, power dependence and luminescence lifetimes were measured and studied in pure cubic phase NaYF4:20%Yb3+, x%Tm3+ (where x=0.1%, 0.2%, 0.5%, 1% and 2%) nanocolloidal phosphors synthesized by thermal decomposition. Increasing concentration of Tm3+ ions led to decrease of luminescence intensity, increase in the slopes of power dependence as well as to the decrease in the luminescence decay- and rise-times, helping to resolve the mechanisms of up-conversion and concentration quenching.
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