Flexible inverted bottom-emitting organic light-emitting devices with a semi-transparent metal-assisted electron-injection layer

— The development of highly efficient and color-saturated green-fluorescent C545T dye-doped flexible inverted bottom-emitting organic light-emitting diode (IBOLED) is reported. This was enabled by the insertion of a silver (Ag) based semi-transparent metal-assisted electron-injection layer between the ITO cathode and n-doped electron-transporting layer on a flexible polyethersulphone substrate. This flexible IBOLED with an ITO/Ag bilayer cathode with its synergistic microcavity effect achieved luminous efficiencies of 20.4 cd/A and 12 lm/W and a saturated CIEx,y of (0.28, 0.68) at 20 mA/cm2, which are 1.5 times higher than those of a conventional OLED.