Ionic liquid modified zinc oxide injection layer for inverted organic light-emitting diodes

We have demonstrated a novel approach for fabricating efficient hybrid organic–inorganic light emitting diodes (HyLEDs) by introducing dopants into solutions processable metal oxides as an interfacial layer. The doped ZnO is prepared by adding ionic liquid (IL) to a precursor solution for the ZnO. In this way a heavily doped ZnO:ILs cathode was obtained that enhances the electron injection properties and assures a good wetting of the organic active materials.

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► Ionic Liquid blended with ZnO leads to enhanced electron injection.
► Ionic Liquid blended with ZnO allows for facile solution processing.
► High luminance levels are reached using inverted OLEDs.