Long‐Persistent Luminescence from an Exciplex‐Based Organic Light‐Emitting Diode

Abstract Organic long‐persistent luminescent systems (OLPLs) exhibiting long‐lasting emission after photoexcitation consist of organic electron donors and acceptors, that are widely used in organic light‐emitting diodes (OLEDs). Although OLPLs and OLEDs include very similar excitonic processes, long‐lasting emission has never been observed in OLEDs. This study confirms the presence of long‐persistent luminescence (LPL) under electrical excitation.