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Photoactivity represents the ability of a material, generally speaking a semiconductor, to become active when interacting with light. It can be declined in many ways, and several functionalities arising from this behavior of materials can be exploited, all leading to positive repercussions on our environment. There are several classes of effects of photoactivity, all of which have been deeply investigated in the last few decades, allowing to develop more and more efficient materials and devices. All of them share a common point, that is, the interaction of a material with light, although many different materials are taken into account depending on the effect desired—from elemental semiconductors like silicon, to more complex compounds like CdTe or GaAs, to metal oxides like TiO2 and ZnO. Given the broadness of the field, a huge number of works fall within this topic, and new areas of discovery are constantly explored. The special issue “Novel Photoactive Materials” has been proposed as a means to present recent developments in the field, and for this reason the articles included touch different aspects of photoactivity, from photocatalysis to photovoltaics to light emitting materials.

organometal --- crystallinity --- surfactant --- confocal microscope --- nanostructured materials --- titanium dioxide --- anodizing --- photocatalysis --- toluene --- rhodamine B --- hydrothermal synthesis --- silver phosphate --- degradation --- low power white-light LED irradiation --- broadband spectra --- photocatalysis --- Fe/N-TiO2 --- sol-gel --- hydrothermal --- photocatalytic --- visible-light --- electron transport material --- titanium oxide --- charge dynamics --- metal-halides perovskites --- advanced oxidation processes --- bio-based substances --- hybrid nanomaterials --- magnetic materials --- photo Fenton --- caffeine --- perovskite solar cell --- DFT calculations --- mechanical property --- CH3 --- titanium(IV) oxo-clusters --- photoactivity --- band gap modification --- photoluminescence --- DFT calculations --- composite materials --- ZnO --- photo-oxidation --- 4-chlorophenol --- CuxO-ZnO catalyst --- photodeposition --- TiO2 nanoparticles --- alkylalkoxysilane --- stone protection --- water-repellency --- photocatalysis --- UV ageing --- artificial rain --- photo-oxidative degradation --- durability --- photocatalysis --- photovoltaics --- organic light emitting diodes (OLEDs) --- TiO2 --- ZnO --- density functional theory (DFT)