Light-emitting electrochemical cell (LEC) using polythiophene derivative

Solid-state polymer light-emitting electrochemical cells have been fabricated using thin films of blends of polymer electrolytes and urethane-containing polythiophene (PURET) as active material. We have prepared various types of polymer electrolytes such as poly(acrylate)s and poly(ether ester)s. The devices emit orange-red light with the maximum intensity at 590 nm at room temperature, The typical voltage (V)- current density (I)- luminance characteristics of an ITO / PURET + polymer electrolyte complexed with LiClO4 / Al cell under forward and reverse bias conditions were measured. The I-V curve is symmetric at zero bias. The apparent threshold voltages fur current injection and visible light emission are around 2 similar to 3V.