Figure 4
From: Manipulating Mn–Mgk cation complexes to control the charge- and spin-state of Mn in GaN
Infrared photoluminescence of GaN:(Mn,Mg) samples.
(a) evolution of the PL spectra (excited with a 442 nm (2.8 eV) laser) as a function of the y ratio, measured at 2 K (a multiplying factor of 1.4 has been applied between consecutive spectra for clarity); (b) integrated PL intensity normalized by the Mn concentration and sample thickness as a function of the y ratio (red circles, left scale) and evolution of the fraction of different complexes, calculated as a function of y (lines, right scale); (c) evolution of the PL spectra with temperature, for a sample with y = 4.1; the background at 296 K is also included. A factor of 1.4 has been applied between consecutive spectra for clarity. (d) evolution of the integrated PL intensity as a function of the inverse temperature, normalized to the value at T = 5 K; the line is a guide for the eye. Inset: levels relevant to PL as discussed in the Supplementary Information.
