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A Dislocated Twin-Locking Acceptor-Donor-Acceptor Configuration for Efficient Delayed Fluorescence with Multiple Through-Space Charge Transfer.

Organic materials featuring intramolecular through-space charge transfer (TSCT) excited states are advantageous for efficient thermally activated delayed fluorescence (TADF), while the realization of multiple TSCT systems remains challenging. Herein, a rigid molecule with three-dimensional dislocated sandwich acceptor-donor-acceptor configuration has been developed by linking bi-phenazines (2PXZ) donor and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor via twin-locking of two spiro-fluorene bridges. The twin-locking construction with multiple TSCT effects suppresses the intramolecular rotations of various segments in 2PXZ-2TRZ, leading to a small singlet-triplet energy difference, fast reverse intersystem crossing process, and high photoluminescence quantum yield. This material simultaneously possesses the capabilities of TADF and aggregation-induced emission. The device employing 2PXZ-2TRZ as dopant displays an optimal external quantum efficiency of 27.1% and low efficiency roll-off.