Efficient Color Tuning of Upconversion Luminescence from Core-Shell Oxysulfide Nanoparticles

Figure 5

Fluorescence decay curves of red (670 nm) and green (548 nm) emissions of Y₂O₂S: Er³⁺ @ Y₂O₂S: Yb³⁺, Ho³⁺ (Core-Shell) and Y₂O₂S: Yb³⁺, Er³⁺ samples under 980 nm excitation.