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Thermally activated delayed fluorescence (TADF) materials have been widely studied for the fabrication of high‐performance organic light‐emitting diodes (OLEDs), but the serious efficiency roll‐offs still remain unsolved in most cases. Herein, it is wish to report a series of robust green TADF compounds containing rigid xanthenone acceptor and acridine‐based spiro donors. The enhancement in molecular...