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Absorption (ABS) and luminescence emission (FLSC, 440 nm excitation, normalized against the peak intensity) spectra of CZnS-Dots (left) and CZnO-Dots (right) in aqueous solutions. As also shown for comparison, the carbon nanoparticles doped with ZnS or ZnO but without PEGs were not emissive (dashed lines, ×10 and offset by 0.1 for easier viewing).
