Figure 1: GFLED and characterization.
From: A spectrally tunable all-graphene-based flexible field-effect light-emitting device
(a) Schematic of the GFLED. A distinct semi-reduced GO (blue) at the interface between GO (orange) and rGO (gold) is responsible for light emission. (b) PL spectrum of light-emitting layer. The D and G Raman peaks are marked. Inset: Raman spectra of the GO and rGO samples. The GO and rGO samples do not show any PL signals. (c) X-ray photoemission spectroscopy spectra of rGO (red), GO (green) and the light-emission layer (black). Spectra from the C 1s and O 1s orbitals are shown. (d) Bright red light emission from the GFLED on a flexible polyethylene terephthalate (PET) substrate under a 12 V bias voltage and a 0.1 A drive current. The GFLED size is around 100 × 100 μm. The edge of the bent PET is marked by a dashed line. The bending radius is ∼8 mm.
