Organic light emitting diodes (OLEDs) are thin, lightweight and flexible whilst still maintaining high efficiencies. Therefore, OLEDs are at the forefront of display technology and recently, applications of OLEDs have emerged in solid state lighting. Additionally, OLEDs can be made extremely flexible and stretchable, making them suitable for use in wearable electronics. Among light emitting materials for OLEDs, thermally activated delayed fluorescent (TADF) materials have shown great promise in the last few years. In this study, we report a solution processable TADF emitting polymer as an emissive material for OLEDs. The bespoke polymer structure has the TADF emitter 4-(9H-carbazol9-yl)-2-(3′-hydroxy-[1,1′- biphenyl]-3-yl)isoindoline-1,3-dione as a pendant group on a poly(methyl methacrylate) based polymer chain. We demonstrate ink-jet printed OLEDs using our TADF polymer, which allows for precise patterning without masks, deposition of nanometer scale thicknesses, and minimal wastage
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