Figure 2: Electroluminescence of GFLED.
From: A spectrally tunable all-graphene-based flexible field-effect light-emitting device
(a) Source-drain current (circles) and EL intensity (solid squares) versus source-drain bias voltage. The device used has a W/L ratio around 0.1 mm/0.1 mm. The solid line shows the Poole–Frenkel fitting of the drive current. The EL peak is at 690 nm. Inset: source-drain current versus gate voltage of the same device, showing a p-type field effect. (b) Histogram of EL intensity distribution under fixed voltage and current bias. The data have been obtained from 20 devices. (c) Typical EL spectra of a single GFLED. Gate biases are from 0 to 50 V. (d) Peak position (wavelength) and intensity of the GFLED EL versus gate voltage. The data have been collected from 19 devices. Error bars (standard uncertainty) are estimated from the device variations.
