Abstract
Large-area top-emitting organic light-emitting diodes (TEOLEDs) with multi-layer structure are successfully demonstrated using the solution-processable blade coating on ITO-free substrate. The semitransparent cathode of TEOLED is composed of lithium fluoride (LiF), aluminum (Al) and silver (Ag). The composition of 3nm Al and 10nm Ag has a transmittance of 56% and a sheet resistance of 11Ω/□. It is applied to the green phosphorescence device with an emissive area of 2cm by 2.5cm. The maximum current efficiency is 25.2cd/A with high light-emission uniformity within 10% variation. The large-area TEOLEDs show comparable current efficiency as the small-area devices with an emissive area of 2mm by 2mm (having the same device structure) and better efficiency than traditional large-area bottom-emitting devices. Cesium fluoride (CsF) and n-doped electron transport layer are applied to improve electron injection. At 6V, the luminance is raised from 141cd/m2 to 502cd/m2 and 304cd/m2, respectively. In n-doped device, a simple Al/Ag cathode is used without LiF.
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