title: A spectrally tunable all-graphene-based flexible field-effect light-emitting device.
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.
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Xiaomu
authors.initials: X
authors.lastname: Wang
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: He
authors.identifier: 0000000173282182
authors.initials: H
authors.lastname: Tian
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Mohammad Ali
authors.identifier: 0000000157053611
authors.initials: MA
authors.lastname: Mohammad
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Li
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Can
authors.initials: C
authors.lastname: Wu
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.affiliation: 1] Institute of Microelectronics, Tsinghua University, Beijing 100084, China. [2] Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
authors.forename: Tian-Ling
authors.initials: TL
authors.lastname: Ren