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. 2016 Jul 13;6:29746. doi: 10.1038/srep29746

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Up-converted emission spectra of as-synthesized NaYF₄:Tm³⁺,Yb³⁺ NPs in CHCl₃ (a) and after loading in PSS/PDADMAC (b) and DEX/CHIT (c) nanocapsules with different concentrations under 980 nm laser diode excitation.