Light-emitting electrochemical cells (LECs) have been fabricated by employing thin films of the blend poly(p-phenylene vinylene) (PPV) and waterborne polyurethane ionomer (WPUI) neutralized with lithium hydroxide, sandwiched between an anode (indium. tin oxide coated glass, ITO) and a cathode (Al). The conjugated polymer is p-doped and n-doped on the opposite side of the polymer layer when the external bias is applied, and a light-emitting p-n junction is in-situ formed in this assembly. The counterions are provided by WPUI to make the matrix ionically conducting, which is necessary for doping. Green light emission was observed in this study with a onset voltage of about 2.4 V. The LEC characteristics of normal LEC devices and those that had experienced assembly failure were studied using cyclic voltammetry. The results of this study would be useful to the new researchers interested in fabricating and characterizing LECs.