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. 2021 Jan 22;11(2):284. doi: 10.3390/nano11020284

Figure 3.

Figure 3

Upconversion luminescence spectra (UCL) of (a) core particles NaGdF4:Yb (20%) and Er(8%). (b) Core–shell particles NaGdF4:Yb (20%) and Er (8%)@ NaYb0.90F4:Nd (10%). (c) Core–shell–shell particles NaGdF4:Yb (20%) and Er (8%)@ NaYb0.90F4:Nd (10%) @ NaYF4 UCNP particles under 980 nm laser excitation at different laser intensities. UCL of (d) core–shell particles NaGdF4:Yb (20%) and Er (8%)@ NaYb0.90F4:Nd (10%). (e) Core–shell–shell particles NaGdF4:Yb (20%) and Er (8%)@NaYb0.90F4:Nd (10%)@ NaYF4 UCNP particles under 808 nm laser excitation at different laser intensities. (f) Comparison of temperature rise of 1 mg/mL CSS-PAA UCNPs dispersed in 2 mL of distilled water under 808 and 980 nm laser irradiation at 50 W ·cm−2 for 20 min.