A spectrally tunable all-graphene-based flexible field-effect light-emitting device

• DOI: 10.1038/ncomms8767
• Publication Date: 2015-07-16T12:26:04Z
• Authors: Xiaomu Wang; He Tian; Mohammad Ali Moha...; Cheng Li; Can Wu; Yi Yang; Tian-Ling Ren
• Keywords: Biasing

Abstract The continuous tuning of the emission spectrum a single light-emitting diode (LED) by an external electrical bias is great technological significance as crucial property in high-quality displays, yet this capability has not been demonstrated existing LEDs. Graphene, tunable optical platform, promising medium to achieve goal. Here we demonstrate bright spectrally electroluminescence from blue (∼450 nm) red (∼750 at graphene oxide/reduced-graphene oxide interface. We explain results recombination Poole–Frenkel ionized electrons localized energy levels arising semi-reduced oxide, and holes top π band. Tuning wavelength achieved gate modulation participating levels. Our demonstration current-driven LEDs only represents method for but also may find applications displays.