Fig. 1
Characterization of Ln-doped QDs. a Photodocumentation of a colloidal stability of QDs showing their stability without sedimentation at start-point (0 h) and upon 7 days of storage at 25 °C in RS. b Corresponding size distribution histograms analyzed by quasielastic DLS. Inserted are ζ-potential values analyzed in RS 100-fold diluted with Milli-Q water (pH 7.4) by Doppler microelectrophoresis. c TEM micrographs with the length of scale bar 50 nm. d XPS survey spectra and e FT-IR spectra of Ln-doped QDs and individual components used for synthesis. f Photographs of Ln-doped QDs in ambient light and after exposure to UV transillumination (λexc = 312 nm). Inserted are QY values determined using rhodamine 6G as a reference