Confining electron donor and acceptor in space to realize high efficiency charge-transfer luminescence

摘要

Through-bond charge transfer (CT) could easily occur between an electron donor (D) and an electron acceptor (A),which is fundamental to design various D-A type emissive materials for organic light-emitting diode (OLED) application. Although D-A type emitters have been developed for many years, what makes them in the spotlight is the rise of thermally activated delayed fluorescence (TADF) materials.In 2012, Adachi et al.[1] reported a series of D-A emitters with TADF features to fully utilize electrogenerated excitons. After the pioneer work, numerous TADF materials with D-A structure were extensively explored for the application of organic light emitting diodes (OLEDs)[2].