Correlated Disorder Substrate‐Integrated Nanodisk Scatterers for Light Extraction in Organic Light Emitting Diodes

A major loss mechanism in organic light emitting diodes (OLEDs) is the coupling of emitter molecule field to waveguide modes OLED thin film stack. In this work, a disordered 2D array TiO2 nanodisk scatterers integrated into substrate enable efficient extraction from these modes. Fabrication nanodisks based on bottom-up, colloidal lithography technique and subsequent pattern transfer high refractive index via reactive ion etching. The substrates are completed by spin-coating polymer planarization layer before applying This ensures reproducible optoelectronic properties through leaving electrically active layers planar. Simultaneously, close vicinity stack ensure out-of-plane scattering monochromatic (center wavelength λ0 = 520 nm), 44.2%rel increase external quantum efficiency achieved comparison device without structure. An in-depth numerical analysis reveals that significant enhancement only partly due out-coupling Additional suspected result nanodisks. Further improvements structure numerically evaluated.