Polymer light-emitting diodes with cathodes printed from conducting Ag paste

All-printable polymer light-emitting diodes (PLEDs) are realized by the development of a new bilayer cathode that combines Ag paste with aminoalkyl-substituted polyfluorenes. PLEDs with a printed Ag-paste cathode (see figure) show comparable device performance to those devices incorporating a low-work-function cathode (Ba/Al) that is deposited thermally.