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Fig. 6. Luminescence decay curves of the 5D4 energy level of Tb3+ ions (a) and Yb3+:7F5/2 level (c) for NaYF4 colloidal nanoparticles doped with different amounts of Mn2+ ions. Concentration dependence of luminescence lifetimes for Tb3+:5D4 (b) and Yb3+:2F5/2 (d) energy levels.