Abstract
In this paper, semitransparent electrodes with the structure substrate/MoO3/Al/MoO3 (OMO) were fabricated via the thermal deposition method for use as the anode in organic light-emitting diodes (OLEDs). The optical transmittance of the metal layer was enhanced by depositing metal oxidation (MoO3) and metal (Al) layers. The optimal thickness of the Al thin films was determined to be 15nm for high optical transmittance and good electrical conductivity. The optimized films show the typical sheet resistance of 7Ω/sq and a high transmittance of 70% at 550nm. The indium-tin-oxide (ITO)-free OLEDs with the fabricated composite anodes on a glass substrate exhibited the high luminance and current efficiency of 21,750cd/m2 and 3.18cd/A, respectively. In addition, bending effects on the polyethersulfone (PES) substrate/MoO3/Al/MoO3 and PES substrate/MoO3/Al structures were investigated. Cracks formed on the surface of the samples with a bending radius smaller than or equal to 1cm. MoO3 covering the Al layer modifies the surface of the electrode and enhances durability. The surface roughness of the bi-layer films was higher than that of the tri-layer films. Therefore, OLEDs with OMO anode outperform those with bi-layer films anode.
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