Abstract
This work demonstrates the favorable performance of a transparent polymeric light-emitting diode (PLED) using an effective LiF/Ag/indium tin oxide (ITO) cathode. An Ag layer can prevent the underlying emitting layer from damage by bombardment during ITO sputtering. Devices that have an Ag layer have a lower driving voltage and lower leakage current than those without. X-ray photoelectron spectroscopy data show that Ag increases the concentration of Li in the polymer, enhancing its electron injection and transport capacities. The lower leakage current results from the fact that the work function of Ag is lower than that of ITO. The insertion of the Ag layer also enhances the optical characteristics by improving carrier balance and reducing sputtering damage.
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