Fig. 4: The photophysical properties and chemical composition of CA, m-CDs and m-CDs@CA. | Light: Science & Applications

Fig. 4: The photophysical properties and chemical composition of CA, m-CDs and m-CDs@CA.

From: Enabling robust and hour-level organic long persistent luminescence from carbon dots by covalent fixation

Fig. 4: The photophysical properties and chemical composition of CA, m-CDs and m-CDs@CA.

a UV-Vis absorption (Abs), photoluminescence (PL) emission and excitation spectra of CA (top), m-CDs (middle), and m-CDs@CA (bottom) under ambient conditions. PL, phosphorescence emission and excitation spectra of m-CDs were measured from their ethanol dispersion and PVA film, respectively; PL, afterglow emission and excitation spectra of CA and m-CDs@CA (0.1 wt% sample) are measured from their powders. The absorption spectra of m-CDs, CA and m-CDs@CA were obtained from DMF dispersions of each material. Phosphorescence was abbreviated as Phos in this figure for clarity. b, c PL (b) and afterglow (c) emission spectra of m-CDs@CA with different ratios of m-CDs under 365 nm excitation. d, e FT-IR (d) and XPS (e) spectra of m-CDs, CA, and m-CDs@CA. f–h High-resolution XPS spectra and the corresponding fitting curves of the C 1 s (f), N 1 s (g), and O 1 s (h) core levels of the CA, m-CDs, and m-CDs@CA.

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