Abstract
A capping IZO film was used to successfully improve the storage and thermal stabilities of Ag films applied in top-emitting OLEDs (TOLEDs). Ag films at the thickness of 200 nm were prepared by direct current (DC) magnetron sputtering onto glass substrates, after which IZO films of various thicknesses were deposited by radio frequency (RF) sputtering. It was found that the optimized Ag/IZO films showed no deterioration in reflectance after accelerated aging tests. SEM and XRD results revealed that the void-free capping IZO films could efficiently prevent Ag films from tarnishing and agglomerating. Additionally, the patterning property, surface roughness and resistivity of the composite Ag/IZO film have been characterized and show good potential when used as the reflective electrode in TOLEDs. Finally, green TOLEDs using Ag/IZO as the anode were fabricated. Compared with the conventional single-layer Ag anode, the luminance efficiency at 1000 cd/m2 increased from 17.6 cd/A to 22.0 cd/A. The half-life was extended by 42.7%.
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