Moreover, the peaks of the native ligand shell (oleic acid and oleylamine) decrease significantly compared to the spectrum of the native NCs before exposure to DCzGPC (Fig. , blue data). A peak broadening is often attributed to an increased lateral relaxation due to neighboring ligand molecules, indicating an attachment of this species to the NCs. Taken together, these finding support a successful, partial replacement of oleylamine/oleic acid from the surface of the NCs by DCzGPC. By scanning electron microscopy (SEM) before and after ligand exchange, we find an increase in the average size of the NCs by ~1.5 nm (Fig. ) and an unaltered cubic shape (Fig. ). A comparison of the absorption and PL properties before and after ligand exchange reveals a significant hypsochromic shift, which increases upon adding more DCzGPC ligand (Fig. ).