In this paper we report an effective synthesis and the characterization of novel 1,3,4-oxadiazole monomers via tetrazole intermediates and their polymerization to side group polymers with laterally fixed charge transport units. The use of these polymers as electron transport layer in light emitting diodes (LED) together with poly (phenylene vinylene) (PPV) leads to improved device performance. The light intensity of our LEDs was increased by a factor of 100 compared to a PPV monolayer diode to 300 Cd/m(2) at 30 V. This corresponds to an external quantum yield of 0.1% using a silver electrode, as cathode.