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Carbon nanotubes have the potential to function as light-emitting devices, which could lead to a variety of nanophotonics applications. However, nanotubes currently have a low luminescence quantum yield, typically around 1%, which is restricted by their one-dimensional nature. In a new study, scientists have demonstrated that artificially modifying the dimensionality of carbon nanotubes by doping them with zero-dimensional states can increase their luminosity to 18%. The findings could lead to the development of nanophotonics devices such as a near-infrared single-photon emitter that operates at room temperature.