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We demonstrate extremely stable and highly efficient organic light-emitting diodes (OLEDs) based on molybdenum oxide (MoO3) as a buffer layer on indium tin oxide (ITO). The significant features of MoO3 as a buffer layer are that the OLEDs show low operational voltage, high electroluminescence (EL) efficiency and good stability in a wide range of MoO3 thickness. A green OLED with structure of ITO∕MoO3∕N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidene (NPB)∕NPB: tris(8-hydroxyquinoline) aluminum (Alq3):10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H, 5H, 11H-(1)-benzopyropyrano(6,7-8-i,j)quinolizin-11-one (C545T)∕Alq3∕LiF∕Al shows a long lifetime of over 50000h at 100cd∕m2 initial luminance, and the power efficiency reaches 15lm∕W. The turn-on voltage is 2.4V, and the operational voltage at 1000cd∕m2 luminance is only 6.9V. The significant enhancement of the EL performance is attributed to the improvement of hole injection and interface stability at anode.
You et al. (Mon,) studied this question.