Figure 3.

The CIE 1931 x, y chromaticity space of ZnO nanotubes, for (a) as grown, (b) annealed in argon, (c) annealed in air, (d) annealed in oxygen, (e) annealed in nitrogen, and (f) all together.

Alvi et al. Nanoscale Research Letters 2011 6:130   doi:10.1186/1556-276X-6-130
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