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Conjugated fused‐ring structures have attracted extensive attention due to their high molecular rigidity to restrain excited‐state relaxation and non‐radiative decay, and further to enhance the luminance efficiency for emissive materials. Herein, we develop a series of donor‐acceptor type thermally activated delayed fluorescence (TADF) emitters by introducing fused‐ring 5H‐benzofuro[3,2‐c]carbazole...