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. 2022 Jun 22;10:891727. doi: 10.3389/fbioe.2022.891727

FIGURE 2.

FIGURE 2

Luminescence analysis of NaYF4:Tm,Yb (green), NaYF4:Tm,Yb@NaYF4@SiO2 (red), and NaYF4:Tm,Yb@NaYF4 (black). The corresponding fluorescent photographs are shown in the inset images from the left to right. All samples at 1 mg/ml were used in the experiment.