The exciplex has attracted immense attention as a highly efficient organic light-emitting diode (OLED) emitter owing to the inclusion of a thermally activated delayed fluorescence (TADF) process. Moreover, the exciplex can exhibit long-persistent luminescence (LPL) over several hours by optimization of the donor and acceptor concentrations. However, there have been no reports of LPL from exciplex OLEDs, and the correlation between OLEDs and OLPLs has not yet been clarified. In this study, we confirmed the presence of OLPL under electrical excitation. We elucidated the detailed emission processes of OLPL systems including the thermal activation process such as TADF.
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