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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Chen et al. (2007) studied this question.
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