Poly(phenylenevinylene)-based organic light-emitting diodes (OLEDs) are fabricated using air-stable metal oxides as electrodes, producing very efficient and 21 bright electroluminescent devices. Efficiencies of 8 cd A(-1) and luminances above 20000 cd m(-2) are obtained, comparable parable to the values reported for classic OLED structures using reactive metals as cathodes.