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(a) Transmission electron microscopy (TEM) images of UCNPs-2; (b) depletion efficiency of UCNPs-2; (c) the upconversion imaging of UCNPs-2 film with laser co-irradiation; (d) the UCNPs-2 image with/without 810 nm laser co-irradiation; (e) the fluorescence spectra of UCNPs-2 under the different excitation wavelength; (f) the depletion efficiency of UCNPs-2 with different Tm3+-doped concentrations; (g) the curve of depletion efficiency of UCNPs-2 [55].
