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(A) Absorption spectra of the GQDs. (B) PL emission of the GQDs in the visible range (λexc = 400 nm). The inset shows the PL emission of a dispersion of GQDs upon excitation at 400 nm. (C) PL emission of the GQDs in the NIR range (λexc = 980 nm). The GQD concentration was 0.1 mg/mL.
