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Emission spectra from a selection of as-grown bare nanocolumns, and from nanocolumns containing single InGaN QDisks. The extra emission peaks from the QDisk sample are attributed to emission from the disks.
[(a)–(c)] Spatial PL maps from the column under investigation at emission energies of 3.46 eV (GaN), 3.41 eV (defect), and 3.33 eV, respectively. [(d)–(f)] Emission spectra at various positions along the column length as shown in the figure insets.
Photoluminescence decay traces measured from the three main emissions from the nanocolumn (at peak intensity).
Spatially resolved PL intensity at slices in time after the laser excitation pulse. At low values of the distribution is fairly homogeneous, whereas at large values of almost all remaining carriers are in the QDisk. The plot on the right shows the total PL intensity as a function of time from the regions labeled 1, 2, and 3.
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