A small-molecule zwitterionic electrolyte without a π-delocalized unit as a charge-injection layer for high-performance PLEDs

Down to the bare bones: Small-molecule zwitterionic materials were found to be more efficient as charge-injection materials in an organic electronic device than a previously described polymer (see structures). Furthermore, the superior device performance observed for 1 indicates that it is not necessary to focus only on π-delocalized systems and that solid ionic liquids may be promising alternative candidates for charge-injection materials.