To realize high-efficiency organic light-emitting diodes (OLEDs), it is essential to boost out-coupling
efficiency. Here we review our latest reports upon light manipulation for OLEDs by integrating a
dual-side bio-inspired deterministic quasi-periodic moth’s eye nanostructure with broadband
anti-reflective and quasi-omnidirectional properties. Light out-coupling efficiency of OLEDs with
stacked triple emission units is over 2 times that of a conventional device, resulting in drastic increase in
external quantum efficiency and current efficiency to 119.7% and 366 cd A-1 without introducing
spectral distortion and directionality. Theoretical calculations furthermore clarify that the improved
device performance is primarily attributed to the effective extraction of the waveguide and surface
plasmonic modes of the confined light over all the emission wavelengths and viewing-angles.
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