Time-resolved cathodoluminescence imaging of Mn2+ luminescence in Mn-doped CsPbCl3

Using time-resolved cathodoluminescence imaging, we measure the pixel-by-pixel cathodoluminescence decay of Mn2+ dopants in cesium lead chloride perovskite microplates. This measurement generates a spatially resolved map of the excited state decay dynamics of the Mn2+ dopants, which suggest an explanation for enhanced Mn2+ emission near the surface of the microplate. Near the surface, the contribution from the longer lifetime component increases, which implies that the population of excited Mn2+ is higher near the surface. This may arise due to the increased probability of carrier recombination at a Mn2+ dopant near the surface, possibly enabled by an increased concentration of traps.