Acta Physica Sinica, Volume. 69, Issue 14, 147801-1(2020)
Fig. 1. Schematic design of core-shell structured upconversion nanoparticles synthesized with the hot injection method.
Fig. 2. (a), (b) TEM images and (c) the corresponding size distribution of the of NaYF4: Yb, Tm.
Fig. 3. (a)−(d) The schematic core-shell structure, TEM images and size distribution of NaYF4:Yb, Tm@NaYF4 (about 43.8 nm); (e)−(h) the schematic core-shell structure, TEM images and size distribution of NaYF4:Yb, Tm@NaYF4 (about 63.2 nm); (i)−(l) the schematic core-shell structure, TEM images and size distribution of NaYF4:Yb, Tm@NaYF4 (about 80.8 nm); (m)−(p) the schematic core-shell structure, TEM images and size distribution of NaYF4:Yb, Tm@NaYF4 (about 100.7 nm).
Fig. 4. (a) The energy transfer mechanisms of NaYF4:Yb, Tm@NaYF4 UCNPs; (b) the upconversion luminescent spectra and (c) the relative luminescent intensity of core-shell structured UCNPs with different shell thicknesses.
Fig. 5. (a) Schematic structure of UCNP@PEG; (b) TEM image of UCNP@PEG; (c) cell viabilities of HeLa cells after incubation with various concentrations of UCNP@PEG
Fig. 6. Upconversion luminescent images of HeLa cells after culturing with UCNP@PEG for 0.5, 3.0 and 6.0 h.
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Bei Liu, Xi-Jian Lu, Xiao-Ning Liu, Yi-Pin Wu, Bin Zou.
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Received: Mar. 8, 2020
Accepted: --
Published Online: Dec. 28, 2020
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