Structurally Nontraditional Benzo[c]cinnoline‐Based Electron‐Transporting Materials with 3D Molecular Interaction Architecture

Abstract The academically widely used electron‐transporting materials (ETMs) typically suffer from low glass transition temperatures ( T g ) that could lead to poor device stability. Considering practical applications, we herein put forward a “3D molecular interaction architecture” strategy to design high‐performance ETMs. As a proof‐of‐concept, a type of structurally nontraditional ETMs with the benzo[ c ]cinnoline ( BZC ) skeleton have been proposed and synthesized by the C−H/C−H homo‐coupling of N ‐acylaniline as the key step. 2,9‐diphenylbenzo[ c ]cinnoline ( DPBZC ) exhibits strong intermolecular interactions that feature a 3D architecture, which boosts T g to exceedingly high 218 °C with a fast electron mobility ( μ e ) of 6.4×10 −4 cm 2 V −1 s −1 . DPBZC ‐based fluorescent organic light‐emitting diodes show outstanding electroluminescent performances with an external quantum efficiency of 20.1 % and a power efficiency as high as 70.6 lm W −1 , which are superior to those of the devices with the commonly used ETMs.