Researchers from the University of Michigan and The Pennsylvania State University, in collaboration with OLEDWorks, has managed to create high aspect ratio OLED devices, by fabricating the OLEDs on substrates with sub-millimeter, high aspect ratio surface textures. This design increases the active OLED area per panel, reducing the local current density needed to achieve a given luminance.
The researchers report that this approach can extend the lifetime by up to 2.7X, this was verified on a blue fluorescent OLED device. These devices also offer up to 40% higher light extraction efficiency, as the corrugated substrates scatter the trapped light, significantly boosting EQE.
The researchers have used uses standard vacuum thermal evaporation, which is compatible with existing manufacturing techniques, and can be used to deposit tandem OLED stacks.
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