Cover Picture: Red/Near‐Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100?% Internal Quantum Efficiency (Angew. Chem. Int. Ed. 41/2019)

作者：Chen JiaXiong; Tao WenWen; Chen WenCheng; Xiao YaFang; Wang Kai; Cao Chen; Yu Jia; Li Shengliang; Geng FengXia; Adachi Chihaya; Lee ChunSing; Zhang XiaoHong

来源：Angewandte Chemie - International Edition, 2019, 58(41): 14391-14391.

DOI：10.1002/ANIE.201910421

• molecular design
• OLEDs
• red/near-IR emission
• rigid segments
• thermally activated delayed fluorescence

Thermally activated delayed fluorescence (TADF) emitters have been studied thoroughly; however, the development of red/near‐infrared TADF emitters has lagged behind that of green and blue emitters. In their Research Article on page?14660?ff., K. Wang, C.‐S. Lee, X.‐H. Zhang, and co‐workers present two novel red TADF emitters. Organic light‐emitting diodes based on these emitters achieved near 100?% exciton utilization.