Deep‐Red to Near‐Infrared Thermally Activated Delayed Fluorescence in Organic Solid Films and Electroluminescent Devices. Issue 38 (9th August 2017)

• Record Type: Journal Article
• Authors: Li, Chenglong; Duan, Ruihong; Liang, Baoyan; Han, Guangchao; Wang, Shipan; Ye, Kaiqi; Liu, Yu; Yi, Yuanping; Wang, Yue
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 38(2017)
• Page Start: 11525
• Page End: 11529
• Publication Date: 2017-08-09
• Subjects: deep-red emission -- near-infrared emission -- organic light-emitting devices -- thermally activated delayed fluorescence; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201706464
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The design and synthesis of highly efficient deep red (DR) and near‐infrared (NIR) organic emitting materials with characteristic of thermally activated delayed fluorescence (TADF) still remains a great challenge. A strategy was developed to construct TADF organic solid films with strong DR or NIR emission feature. The triphenylamine (TPA) and quinoxaline‐6, 7‐dicarbonitrile (QCN) were employed as electron donor (D) and acceptor (A), respectively, to synthesize a TADF compound, TPA‐QCN. The TPA‐QCN molecule with orange‐red emission in solution was employed as a dopant to prepare DR and NIR luminescent solid thin films. The high doped concentration and neat films exhibited efficient DR and NIR emissions, respectively. The highly efficient DR and NIR organic light‐emitting devices (OLEDs) were fabricated by regulating TPA‐QCN dopant concentration in the emitting layers. Abstract : TPA‐QCN with thermally activated delayed fluorescence was designed and synthesized. The pure crystal and thin film show intense deep red (DR) and NIR emissions, respectively. The supramolecular structure and intermolecular interactions are beneficial to the reduction of non‐radiative transitions and enhancement of emission in the solid state. Doped and neat films were used for high‐performance DR and NIR organic light‐emitting devices (OLEDs).