A portion of the intensity map has been flipped and arranged next to the energy map. A spatial fluctuation in peak energy directly corresponds to a variation in intensity.
Intensity is highest for high emission energy.
Figure 2 Energy distribution of maximum PL emission. The scale for the coded energy is identical to Fig. Luminescence peak energies show a very narrow distribution in energy. Lower energy peak emissions are irrelevant when their relative intensity is taken into account. The brightest emission occurs in the high-energy end of the distribution.