The Stanford University have successfully developed a new concept with a few nanometer of graphene as transparent conductor for OLEDs.They demonstrate organic light-emitting diodes with solution-processed graphene thin film transparent conductive anodes. The graphene electrodes were deposited on quartz substrates by spin-coating of an aqueous dispersion of functionalized graphene, followed by a vacuum anneal step to reduce the sheet resistance. Small molecular weight organic materials and a metal cathode were directly deposited on the graphene anodes, resulting in devices with a performance comparable to control devices on indium?tin-oxide transparent anodes. The outcoupling efficiency of devices on graphene and indium?tin-oxide is nearly identical, in agreement with model predictions.
More Infos:http://pubs.acs.org/doi/abs/10.1021/nn900728d
