Polymer light emitting diodes: new materials and devices

Single layer polymer light emitting diodes (LEDs) are ideal candidates for practical applications due to their easy processing conditions. However, lo w quantum efficiency of light generation is often obtained due to imbalance d charge injection and transport of holes and electrons. In this paper we r eport new conjugated polymers with electron deficient oxadiazole moieties a s side-chains. These polymers have shown at least an order of magnitude inc rease in electroluminescence efficiencies and better charge injection prope rties compared to their corresponding conjugated backbone polymers. In addi tion, novel patterned LED device structures which emit in geometries with f eatures into the submicron range will be presented. Finally, issues regardi ng integration of polymer transistors with organic LEDs will be discussed. (C) 1999 Elsevier Science B.V. All rights reserved.