POLYMETHACRYLATES WITH PENDANT OXADIAZOLE UNITS SYNTHESIS AND APPLICATION IN ORGANIC LEDS

In this paper we report an effective synthesis and the characterizatio n of novel 1,3,4-oxadiazole monomers via tetrazole intermediates and t heir polymerization to side group polymers with laterally fixed charge transport units. The use of these polymers as electron transport laye r in light emitting diodes (LED) together with poly (phenylene vinylen e) (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.