Synthesis of side chain polystyrenes for all organic solution processed OLEDs In the present work side chain polystyrenes were synthesized and characterized in order to be applied in multilayer OLEDs fabricated by solution process techniques. Manufacture of optoelectronic devices by solution process techniques is meant to decrease significantly fabrication cost and allow large scale production of such devices. This dissertation focusses in three series enveloped in two material classes. The two classes differ to each other in the type of charge transport exhibited either ambipolar transport or electron transport. All materials were applied in all organic solution processed green Ir based devices. In the first part a series of ambipolar host materials were developed to transport both charge types holes and electrons and be applied especially as matrix for green Ir based emitters. It was possible to increase devices efficacy by modulating the predominant charge transport type. This was achieved by modification of molecules electron transport part with more electron deficient heterocycles or by…