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(a) Photographs of ITO, graphene, TiO2/graphene/WO3 of 3–5 graphene layers. The Finite-Difference Time-Domain (FDTD) simulation. Calculated Poynting vector magnitude of OLEDs (λ = 520 nm) on (b) 3 layers graphene (G) and (c) TiO2/3 layers graphene/WO3 electrodes by FDTD method. Reproduced with the permission of Reference [69]. Copyright 2016, American Chemical Society.
