Abstract
Blue emission from orthorhombic InOOH nanowires was increased dramatically by 30-fold after doping with 1 mol% Eu. This was attributed to the reduction of Eu(III) to Eu(II), which was localized on the surface and created defects. On the other hand, a larger amount of Eu-doping did not result in strong blue emission. Corundum-type rhombohedral and cubic In2O3 were obtained by post-thermal annealing of the nanowires at 400 and 700 °C, respectively. Interestingly, rhombohedral In2O3 remained stable after doping with 10 mol% Eu even upon high temperature thermal annealing at 700 °C. The morphology was changed significantly for the undoped and 1 mol% doped samples, whereas the 10 mol% doped sample showed resistance to morphological changes upon annealing at 700 °C.
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