Abstract
This study reports a cost-effective method for fabricating densely packed micro-lens arrays (MLAs). These microstructures were created by using different particle sizes of 2, 6, and 10 μm modified silica, polymethyl methacrylate (PMMA), and ethyl acetate solvent. The proposed PMMA-silica composite MLAs were identified to feature highly transparent with a transmittance of 91.2 % and a high haze of 80.2 % in UV–vis regime. Consequently, external quantum efficiency (EQE) of OLED attached MLAs was found to be significantly improved, raising from 6.30 % to 11.67 %, corresponding to a remarkable enhancement of 85 % compared with reference OLED. Additionally, a substantially small CIE coordinate difference of (0.003, 0.0129) was obtained as viewing angles increased from 0° to 60°. The origin of high light extraction efficiency and angular-spectrum stability originated from the strong scattering induced by the high haze, leading to an emissive profile broader than Lambertian. It's worth noting that the fabrication for proposed MLAs is facile, and the substantial improvement suggests that this approach promise for next generation display and lighting applications.
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