Thermally Activated Delayed Fluorescence Materials Based on Donor–Acceptor Molecular Systems

The design and characterization of thermally activated delayed fluorescence (TADF) materials for optoelectronic applications represents an active area of recent research in organic electronics. This chapter presents an overview of the quick development in the molecular structure engineering of TADF materials in donor-acceptor (D-A) molecular architecture. It discusses fundamental design principles and the common relations between the molecular structures and optoelectronic properties for the diversified device applications as emitters, sensitizers, or hosts in organic light-emitting diodes (OLEDs). The chapter highlights a survey of recent progress in the studies of the donor-acceptor (D-A) type TADF materials, with a particular emphasis on the different molecular building blocks for TADF phenomenon. The success in the breakthrough of the theoretical and technical challenges and the revolution of the understandings of organic optoelectronics that arise in developing high-performance TADF materials may pave the way to shape the future of organoelectronics.