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

• Published in: Angewandte Chemie International Edition Vol. 61; no. 49; pp. e202213823 - n/a
• Main Authors: Xie, Feng‐Ming, Li, Hao‐Ze, Zhang, Kai, Shen, Yang, Zhao, Xin, Li, Yan‐Qing, Tang, Jian‐Xin
• Format: Journal Article
• Language: English
• Published: WEINHEIM Wiley 05.12.2022; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: Charge materials; Charge transfer; Chemistry; Chemistry, Multidisciplinary; Configurations; Fluorene; Fluorescence; Locking; Multiple Through-Space Charge Transfer; Organic Light-Emitting Diodes; Organic materials; Photoluminescence; Photons; Physical Sciences; Polycyclic Aromatic Hydrocarbons; Quantum efficiency; Science & Technology; Space charge; Thermally Activated Delayed Fluorescence; Triazine; Twin-Locking Configuration; Thermally Activated Delayed Fluorescence; Polycyclic Aromatic Hydrocarbons; Organic Light-Emitting Diodes; CRYSTALLIZATION-INDUCED EMISSION; Multiple Through-Space Charge Transfer; AGGREGATION; Twin-Locking Configuration
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.202213823

Organic materials featuring intramolecular through‐space charge transfer (TSCT) excited states are advantageous for efficient thermally activated delayed fluorescence (TADF), although the realization of multiple TSCT systems remains challenging. Herein, a rigid molecule with a three‐dimensional dislocated sandwich acceptor‐donor‐acceptor configuration has been developed by a linking biphenazine (2PXZ) donor and 2,4,6‐triphenyl‐1,3,5‐triazine (TRZ) acceptor through the 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, a 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 a dopant displays an optimal external quantum efficiency of 27.1 % and a low efficiency roll‐off. Locking a large polycyclic aromatic hydrocarbon (PAH) by two spirofluorene groups has led to a rigid dislocated sandwich acceptor‐donor‐acceptor (A‐D‐A) configuration that exhibits multiple through‐space charge transfer (TSCT). This emitter shows both efficient thermally activated delayed fluorescence (TADF) and aggregation‐induced emission (AIE).