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

Xiaomu Wang, He Tian, Mohammad Ali Mohammad, Cheng Li, Can Wu, Yi Yang and Tian-Ling Ren ()
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Xiaomu Wang: Institute of Microelectronics, Tsinghua University
He Tian: Institute of Microelectronics, Tsinghua University
Mohammad Ali Mohammad: Institute of Microelectronics, Tsinghua University
Cheng Li: Institute of Microelectronics, Tsinghua University
Can Wu: Institute of Microelectronics, Tsinghua University
Yi Yang: Institute of Microelectronics, Tsinghua University
Tian-Ling Ren: Institute of Microelectronics, Tsinghua University

Nature Communications, 2015, vol. 6, issue 1, 1-6

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

Date: 2015
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DOI: 10.1038/ncomms8767

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