Fig. 2 | Nature Communications

Fig. 2

From: Controlling the fluorescence and room-temperature phosphorescence behaviour of carbon nanodots with inorganic crystalline nanocomposites

Fig. 2

Characterisation of the photoluminescent (PL) behaviour of folic acid-derived carbon nanodot (FF-CND)/host composites. Photographs of the nine F-CND/host nanocomposites with, and immediately after the removal of, UV (365 nm) excitation (a). Steady-state photoluminescence (SS-PL) emission spectra (λex = 320 nm) of Ca (black) Sr (red) and Ba (blue) carbonates (b, solid line), sulphates (c, dotted line), and oxalates (d, dashed line) F-CND/host nanocomposites. Images obtained during video stroboscopy experiments of afterglow from F-CND/CaCO3 nanocomposite (e). UV ON: Nanocomposite under UV (365 nm) excitation showing steady-state luminescence. UV OFF: Photographs of the afterglow at different times (160 ms intervals) showing a decay in afterglow intensity with time. Decay curves obtained from video stroboscopy for Ca (black square), Sr (red circle), and Ba (blue triangle) carbonates (f, solid line), sulphates (g, dotted line), and oxalates (h, dashed line) F-CND/host nanocomposites

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