Figure 4From: The correlation between radiative surface defect states and high color rendering index from ZnO nanotubes CRI values corresponding to different injected currents. (a) Chromaticity diagram shows high CRI values lying close to the Planckian locus. The insert shows the EL emission spectrum of the heterostructure LED. (b) High magnified image showing the CRI values at different operating currents (10, 20, 30, 50 mA).Back to article page