Fig. 5
Dynamics of excited states. a Time-resolved photoluminance of biexciton which can be seen as a single decay process shows that the lifetime is τbx = 510 ± 5 ps. b Single index decay of exciton and fit with a lifetime of τex = 1170 ± 10 ps represents the electron–hole recombination dominating the photoluminance. The lifetime of the exciton is approximately twice that of the biexciton. Here, the extracted ratio ~2.29 is consistent with the theoretical result. The error bar corresponds to the standard deviation of the measurements
