TADF stands for Thermally Activated Delayed Fluorescence, which is a phenomenon in organic materials that allows for the conversion of non-emissive triplet excitons into emissive singlet excitons through a delayed process. This process enables high efficiency in organic light-emitting diodes (OLEDs) and other optoelectronic devices. Research in TADF focuses on developing new organic materials with efficient TADF properties, understanding the underlying mechanisms, and optimizing device performance for applications in lighting, displays, and sensing technologies.