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. 2022 Jan 6;20:22. doi: 10.1186/s12951-021-01227-2

Fig. 1.

Fig. 1

Comparison of characterizations between the conventional multi-layer quantum dot (MQD) and alloy-typed quantum dot (alloy QD). a Schematic representation of MQD (left) and alloy QD (right). b Transmission electron microscopy (TEM) images of (i) MQDs and (ii) alloy QDs. c UV–vis absorption spectra and PL intensities of (i) MQDs and (ii) alloy QDs (inset: fluorescence spectra under 365-nm UV light). d Comparison of the simulated time-of-flight-medium energy ion scattering (TOF-MEIS) spectra of (i) MQDs and (ii) alloy QDs