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To improve the light extraction efficiency of organic light emitting diodes(OLEDs), we developed a novel substrate, i.e., a metamaterial based flat Moiremicro-lens array formed using double nanoimprint, termed Mlens-array,consisting of a hexagonal moir\'e pattern pillar array. By choosing a lowrefractive index dielectric material for the pillar array and a high refractiveindex dielectric material for the layer capped on top of the pillar array, wefabricated the Mlens-array behaving as a conventional convex optical micro-lensarray. The Mlens-array was fabricated on a 4-inch wafer-size glass substrate bydouble-cycle compositional nanoimprint lithography (NIL) which is easy forachieving high throughput fabrication in large-scale. Applying the Mlens-arraysubstrate in a typical green-emitting OLED, the light extraction efficiency wasenhanced by over 100% (2.08-fold) compared to a control device fabricated onthe conventional planar glass substrate.

Over 100% Light Extraction Enhancement of Organic Light Emitting Diodes  Using Flat Moire Micro-Lens Array Fabricated by Double Nanoimprint  Lithography Over a Large Area