Figure 4

Temperature dependence of the PL spectra. (a) PL spectra at 12 K (black) and 85 K (red) excited by 532 nm pulsed laser (filtered from the supercontinuum laser) with the fluence of 12 µJ/cm². (b) Normalized TRPL of the LE state at 12 K (black) and 85 K (red).