Abstract
We report a novel model of high efficiency Organic Light Emitting Diodes (OLEDs) by patterning micro/nano-structures in the 3-layer (Silicon Dioxide-Silicon Nitride-Silicon Dioxide) substrate. The micro-nano-structured OLEDs have been designed and simulated using finite-difference time-domain method. A large variety of light scattering micro/nano-structures including plano-convex & plano-concave micro-lens array, and nano-pillars array were incorporated on the surface of and inside the substrate layer of the OLEDs. We varied the size, shape, and period of the micro/nano-structures to achieve high intensity and efficiency. We have investigated the far field intensity, transmitted power, internal & external quantum efficiency, and angular distribution of light. Simulation results exemplified higher light extraction, angular distribution, and external quantum efficiency in the micro/nano-patterned OLEDs as compared to the conventional OLEDs. Among all kinds of structures, nano-pillar array (height-to-width ratio: 2.13; period: 100 nm) engraved OLEDs showed highest external quantum efficiency of 61.073% at the Far Field 1 with an angular distribution of ± 77°. We strongly believe that, the proposed OLEDs will be considered for commercial applications.
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