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. 2018 Jun 12;8(38):21505–21512. doi: 10.1039/c8ra02928h

Fig. 6. (a) Evolution of the fluorescence intensity of core/shell UCNPs with the same concentration at different time points under 980 nm-excitation with power intensity of 0.08 W cm−2. (b) The ratio of green and red emission intensity at the different time points.

Fig. 6