Fig. 5: Statistics of single-photon emission up to 150 K.

a Evolution of the PL spectrum as function of the temperature. b Redshift of the SPE line with temperature increase due to the reduction of the bandgap following Varshni’s empirical relationship. c Homogenous linewidth broadening due to the increase of temperature. d Arhenious plot of the integrated intensity. The PL peak starts to quench around 150 K and reaches e⁻¹ at 215 K. Shaded region in b, c, and d demonstrate the range of recorded parameters for an ensemble of emitters. Open circles demonstrate measured data for a single emitter in the ensemble and the solid black lines are theoretical fit to the data. e Second-order correlation measurement g⁽²⁾ at T = 5 K and f at 150 K exhibiting g²(0) < 0.3, evidencing that the single-photon nature persists up to our maximum measurement temperature of 150 K and likely persists beyond 200 K. Horizontal dashed lines represents the quantum limit of g⁽²⁾ at 0.5.