Bright visible light emission from graphene.

Autor: Kim YD; 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., Kim H; School of Physics, Konkuk University, Seoul 143-701, Republic of Korea., Cho Y; Department of Physics, Sogang University, Seoul 121-742, Republic of Korea., Ryoo JH; Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea., Park CH; Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea., Kim P; Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea., Kim YS; Department of Physics and Graphene Research Institute, Sejong University, Seoul 143-747, Republic of Korea., Lee S; Department of Electrical Engineering, Columbia University, New York, New York 10027, USA., Li Y; 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., Park SN; Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea., Yoo YS; Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea., Yoon D; Department of Physics, Sogang University, Seoul 121-742, Republic of Korea., Dorgan VE; Micro and Nanotechnology Lab and Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA., Pop E; Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA., Heinz TF; 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., Hone J; Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA., Chun SH; Department of Physics and Graphene Research Institute, Sejong University, Seoul 143-747, Republic of Korea., Cheong H; Department of Physics, Sogang University, Seoul 121-742, Republic of Korea., Lee SW; School of Physics, Konkuk University, Seoul 143-701, Republic of Korea., Bae MH; 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., Park YD; 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.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2015 Aug; Vol. 10 (8), pp. 676-81. Date of Electronic Publication: 2015 Jun 15.
DOI: 10.1038/nnano.2015.118
Abstrakt: 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.
Databáze: MEDLINE