title: Bright visible light emission from graphene.
abstract: Graphene and related two-dimensional materials are promising candidates for atomically thin, flexible and transparent optoelectronics. In particular, the strong light-matter interaction in graphene has allowed for the development of state-of-the-art photodetectors, optical modulators and plasmonic devices. In addition, electrically biased graphene on SiO2 substrates can be used as a low-efficiency emitter in the mid-infrared range. However, emission in the visible range has remained elusive. Here, we report the observation of bright visible light emission from electrically biased suspended graphene devices. In these devices, heat transport is greatly reduced. Hot electrons (∼2,800 K) therefore become spatially localized at the centre of the graphene layer, resulting in a 1,000-fold enhancement in thermal radiation efficiency. Moreover, strong optical interference between the suspended graphene and substrate can be used to tune the emission spectrum. We also demonstrate the scalability of this technique by realizing arrays of chemical-vapour-deposited graphene light emitters. These results pave the way towards the realization of commercially viable large-scale, atomically thin, flexible and transparent light emitters and displays with low operation voltage and graphene-based on-chip ultrafast optical communications.
authors.affiliation: 1] Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea [2] Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Young Duck
authors.identifier: 0000000325939826
authors.initials: YD
authors.lastname: Kim
authors.affiliation: School of Physics, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Hakseong
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Physics, Sogang University, Seoul 121-742, Republic of Korea.
authors.forename: Yujin
authors.initials: Y
authors.lastname: Cho
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Ji Hoon
authors.initials: JH
authors.lastname: Ryoo
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Cheol-Hwan
authors.identifier: 0000000315846896
authors.initials: CH
authors.lastname: Park
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Pilkwang
authors.initials: P
authors.lastname: Kim
authors.affiliation: Department of Physics and Graphene Research Institute, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: Yong Seung
authors.initials: YS
authors.lastname: Kim
authors.affiliation: Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Sunwoo
authors.initials: S
authors.lastname: Lee
authors.affiliation: 1] Department of Electrical Engineering, Columbia University, New York, New York 10027, USA [2] Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Yilei
authors.initials: Y
authors.lastname: Li
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Seung-Nam
authors.initials: SN
authors.lastname: Park
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Yong Shim
authors.initials: YS
authors.lastname: Yoo
authors.affiliation: Department of Physics, Sogang University, Seoul 121-742, Republic of Korea.
authors.forename: Duhee
authors.initials: D
authors.lastname: Yoon
authors.affiliation: Micro and Nanotechnology Lab and Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: Vincent E
authors.initials: VE
authors.lastname: Dorgan
authors.affiliation: Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA.
authors.forename: Eric
authors.initials: E
authors.lastname: Pop
authors.affiliation: 1] Department of Electrical Engineering, Columbia University, New York, New York 10027, USA [2] Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Tony F
authors.initials: TF
authors.lastname: Heinz
authors.affiliation: Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: James
authors.initials: J
authors.lastname: Hone
authors.affiliation: Department of Physics and Graphene Research Institute, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Chun
authors.affiliation: Department of Physics, Sogang University, Seoul 121-742, Republic of Korea.
authors.forename: Hyeonsik
authors.identifier: 0000000223474044
authors.initials: H
authors.lastname: Cheong
authors.affiliation: School of Physics, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Sang Wook
authors.initials: SW
authors.lastname: Lee
authors.affiliation: 1] Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea [2] Department of Nano Science, University of Science and Technology, Daejeon 305-350, Republic of Korea.
authors.forename: Myung-Ho
authors.initials: MH
authors.lastname: Bae
authors.affiliation: 1] Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea [2] Center for Subwavelength Optics, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Yun Daniel
authors.initials: YD
authors.lastname: Park