This Reprint collects research articles and reviews on optical and quantum electronics, comprising advances in the properties and performance of a wide range of materials. These include theoretical calculations of electronic and phonon properties, experimental results on low-dimension materials such as nanowires, atomic clusters, Langmuir-Blodgett films, heat-and-charge transport including hot carriers, applications of photonic upconversion, and results on devices such as transparent RRAMs and perovskite solar cells.