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. 2015 Apr 20;5:9693. doi: 10.1038/srep09693

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(a) The device structure: ITO/HAT-CN/VB-FNPD/PVK:Firpic/PFN:CsF/multilayer graphene, (b) The current density versus voltage (J-V) curves of devices with (▪) 4-layer pristine graphene and (•) 4-layer CsF-doped graphene as cathode. The inset shows the schematic illustration of electron injection from pristine graphene or CsF-doped graphene. (c) The current density-voltage-luminance (J-V-L) curve of the transparent polymer OLEDs, (d) Luminance efficiency verse current density characteristics. The inset shows electroluminescence spectra of the blue-light transparent polymer OLEDs from graphene cathode side.