On your rapidly diminishing list of things graphene cannot improve, go ahead and cross off “light bulbs.” An international team of researchers drawn from Columbia University, Seoul National University, and the Korea Research Institute of Standards and Science have for the first time ever accomplished just that: a graphene light bulb. Emitting visible light is a behavior that goes against the very nature of graphene as a highly-efficient conductor of thermal energy—and was discovered quite by accident—but it may have technological applications in the future as “the world’s thinnest light bulb,” in the words of James Hone, a Columbia engineering professor and co-author of a new study describing the behavior.

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