A broad and tunable visible‐light emission, excited by electrons, from Eu‐doped BN nanotubes has been realized for the first time (see SEM image and corresponding cathodoluminescence, CL, image). The special broad light emission is due to the insertion of Eu2+ ions into the nanotube walls via in situ Eu doping during nanotube growth instead of a common post‐synthesis doping process.

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One-dimensional (1D) nanomaterials including nanotubes, nanowires and nanorods have many new properties, functionalities and a large range of promising applications. A major challenge for these future industrial applications is the large-quantity production. We report that the ball milling and annealing process has the potential to achieve the mass production. Several examples including C, BN nanotubes and SiC, Zn nanowires are presented to demonstrate such capability. In addition, both size and structure of 1D nanomaterials can be controlled by varying processing conditions. New growth mechanisms involved in the process have been investigated and the highenergy ball milling has an important role in the formation of these 1D nanomaterials. r

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