Fig. 1: The need for near-planar, in-pixel light outcoupling structure for ultra-efficient light-emitting devices. | Nature Communications

Fig. 1: The need for near-planar, in-pixel light outcoupling structure for ultra-efficient light-emitting devices.

From: Near-planar light outcoupling structures with finite lateral dimensions for ultra-efficient and optical crosstalk-free OLED displays

Fig. 1

a Conceptual illustration of light outcoupling properties of (i) macroscale half-ball, (ii) microlens array, and (iii) optical structure proposed in this work. Insets are ray diagrams thereof. b Enhancement of the external quantum efficiency (EQE) of OLEDs estimated by trans-scale optical simulation. Here, both the OLED stack and LOS designs are optimized together to maximize EQE for each of the cases. The aperture ratio is defined by the ratio of the area on which a light outcoupling structure is placed to the light-emitting area defined by the intersection of all layers from the anode to the cathode of an OLED. The \({t}_{{{{\rm{LOS}}}}}\) is defined as the maximal height difference between two points at the outcoupling structure. c A comprehensive overview of the trans-scale optimization of the OLED structure and design strategy of the LOS topography.

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