Figure 1
From: Comparison of the Optical Properties of Graphene and Alkyl-terminated Si and Ge Quantum Dots
Photoluminescence excitation and optical density. Tunable PL emission (left axis) obtained for different excitation energies ranging between 2.5–3.9 eV for (a) GQDS and butyl-terminated (b) Si and (c) Ge QDs. In all graphs, the optical density is indicated by the gray solid line (right axis). The colored arrows indicate the different excitation energies.
