Efficient and color-saturated inverted bottom-emitting organic light-emitting devices with a semi-transparent metal-assisted electron injection layer

Abstract

We report the development of highly efficient and color-saturated green fluorescent 10-(2-benzothiazolyl)-1 1 7 7-tetramethyl-2 36 7-tetrahydro-l H 5H 11H-benzo[l]pyrano-[6 7 ij]quinolizin-11-one dye-doped inverted bottom-emitting organic light-emitting diode (IBOLED) 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 This IBOLED with ITO/Ag bilayer cathode with its synergistic microcavity effect achieved luminous efficiencies of 207 cd/A and 124 1m/W and a saturated ClE(x,y) of (0 22 0 72) at 20 mA/cm(2) which are twice better than those of the conventional OLED and have over 60% improvement on IBOLED without ITO/Ag Mayer cathode (c) 2010 Elsevier B V All rights reserved