Bright visible light emission from graphene

Young Duck Kim, Hakseong Kim, Yujin Cho, Ji Hoon Ryoo, Cheol Hwan Park, Pilkwang Kim, Yong Seung Kim, Sunwoo Lee, Yilei Li, Seung Nam Park, Yong Shim Yoo, Duhee Yoon, Vincent E. Dorgan, Eric Pop, Tony F. Heinz, James Hone, Seung Hyun Chun, Hyeonsik Cheong, Sang Wook Lee, Myung Ho BaeYun Daniel Park

Research output: Contribution to journalArticlepeer-review

243 Scopus citations

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 SiO 2 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 (2,800K) 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.

Original languageEnglish
Pages (from-to)676-681
Number of pages6
JournalNature Nanotechnology
Volume10
Issue number8
DOIs
StatePublished - 6 Aug 2015

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