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. Author manuscript; available in PMC: 2018 Sep 21.
Published in final edited form as: ACS Photonics. 2017 Oct 11;4(11):2699–2705. doi: 10.1021/acsphotonics.7b00399

Figure 2.

Figure 2

(a) TEM image of NaYF4:Yb/Tm@NaYF4:Nd core/shell UCNPs. (b) UC process of NaYF4:Yb/Tm@NaYF4:Nd UCNPs under 800 nm excitation. (c) Absorption spectrum of DM-Nitro dye (green curve), and UC emission spectra of UCNPs with ICG (blue curve), UCNPs alone (black curve), and the mixture of UCNPs & ICG & DM-Nitro dye (red curve) in DMSO solution upon 800 nm CW laser excitation. Inset: the corresponding luminescence photographs of (i) UCNPs alone, (ii) the mixture of UCNPs & ICG, and (iii) the mixture of UCNPs & ICG & DM-Nitro dye in DMSO solution under 800 nm CW laser excitation.