ITO-free OLEDs Research Articles

P‐116: Efficiency Enhancement in ITO‐free Green Organic Light Emitting Diodes Utilizing Nano‐Composite Scattering Films

AbstractWe demonstrate significant efficiency enhancement of ITO‐free OLEDs by combining both the high‐conductivity conducting polymer PEDOT: PSS as the transparent electrode and the solution‐processed nano‐composite scattering films as optical extraction layers. The external quantum efficiency (EQE) of ITO‐free device can be significantly enhanced by a factor of 1.8 at 1000 cd/m2.

Enhanced light extraction in ITO-free OLEDs using double-sided printed electrodes

We show how nanoimprint lithographic techniques are particularly suited for the realization of OLED device structures. We tested them to realize nanopatterned metallic electrodes containing photonic crystals to couple the light out and plasmonic crystals showing extraordinary transmission. At similar current densities, a two-fold electroluminescence is achieved with devices having double-sided structured metallic electrodes as compared to a control OLED with an ITO anode. The use of combined nanoimprint lithography processes has the potential to expand the performance range of various organic optoelectronic devices.