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Optical properties of UCNPs and PS-UCNPs. (A) Photoluminescence (PL) spectra of core UCNPs and core@shell UCNPs. (B) Absorbance spectra of RB and Ce6, and PL spectrum of UCNPs. (C) PL spectra of four kinds of UCNP samples (Bare, RB-loaded, Ce6-loaded, and RB and Ce6-loaded samples).
