Fabrication of Flexible PDMS Films with Micro-Convex Structure for Light Extraction from Organic Light-Emitting Diodes

In this study, we demonstrated organic light-emitting diodes (OLEDs) outcoupling with a flexible polydimethylsiloxane (PDMS) film micro-convex structure using the breath figure (BF) method. We can easily control pattern by adjusting concentration of polystyrene and humidity during BF process. As process conditions to fabricate structure, polymer concentrations 10, 20, 40, 80 mg/mL 60, 70, 80% relative were used. To evaluate optical properties, analyzed transmission, diffusion, electroluminescence or without on OLEDs. The shape density are related its properties have experimentally this. By applying it achieved up 42% improvement in external quantum efficiency compared bare OLEDs (without any light extraction film). expect fabricated be effective for applicable devices.