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Remanagement of Singlet and Triplet Excitons in Single‐Emissive‐Layer Hybrid White Organic Light‐Emitting Devices Using Thermally Activated Delayed Fluorescent Blue Exciplex

A high-performance hybrid white organic light-emitting device (WOLED) is demonstrated based on an efficient novel thermally activated delayed fluorescence (TADF) blue exciplex system. This device shows a low turn-on voltage of 2.5 V and maximum forward-viewing external quantum efficiency of 25.5%, which opens a new avenue for achieving high-performance hybrid WOLEDs with simple structures.