Voltage-induced incandescent light emission from large-area graphene films was demonstrated. Stable, bright, and uniform incandescent emission with a low turn-on voltage (∼6 V) was obtained for a free-standing graphene film (0.5×1 cm2) under appropriate vacuum (0.05 Torr) or Ar protection. The emission spectra fit well to the blackbody emission model with the emission intensity being exponentially proportional to the external voltage and inversely proportional to the gas pressure. Our results indicate great promise of graphene-based incandescent emitters for flat-lighting applications.
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Yu et al. (2010) studied this question.
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