High-efficiency electroluminescent polymers with stable high work function metal Al and Au as cathode

Soluble conjugated copolymers (PFN-TPA) derived from 2,1,3-benzothiadiazole (BTDZ), triphenylamine (TPA) and 9,9-bis(3'-(N,N-dimethylamino)propyl)fluorene (DMAPF) were synthesized by palladium(0)-catalyzed Suzuki coupling reactions. Optoelectronic properties of the copolymers were characterized by UV-vis absorption, cyclic voltammetry, photoluminescence and electroluminescence. All these copolymers show excellent EL performances in the devices with Ba/Al, Al and even Au as cathode and are promising candidate for fabrication and patterning of air-stable flat panel displays. (c) 2006 Elsevier Ltd. All rights reserved.