Solution‐processable thermally activated delayed fluorescence emitters for application in organic light emitting diodes

Abstract Solution‐processed organic light emitting diodes (OLEDs) have been fabricated using the thermally activated delayed fluorescence (TADF) emitter, DACT‐II, and its soluble derivative, t Bu‐DACT‐II, as emitting dopants. DACT‐II reportedly exhibits very high external quantum efficiencies (EQEs) in vacuum‐processed OLEDs. The solution‐processed DACT‐II‐based and t Bu‐DACT‐II‐based OLEDs exhibited external quantum efficiency exceeding the theoretical upper limit of classical fluorescent OLEDs.