“…This leads to the characteristics of SF emission such as accelerated decay rates and superlinear emission intensity. , As a result, the SF emission characteristics are highly dependent on the number of coupled NC emitters and are therefore highly sensitive to changes in NC coupling as a result of irregular ordering of the NCs. SL crystallographic defects such as grain boundaries, NC vacancies, and steps and kinks, along with size inhomogeneity and segregation, are all contributors to a reduced SL structural coherence. − Inconsistencies in reported SF measurements were attributed to these structural heterogeneities of the CsPbBr 3 SLs and may be the main cause for reduced coupled emission. ,, Lapkin et al mapped the structural and optical heterogeneities of single CsPbBr 3 SLs, using spatially resolved X-ray diffraction and scattering techniques along with photoluminescence (PL) measurements. A PL blue shift from the SL edges compared to their center was observed and attributed to residual uniaxial compressive strains from the SL formation .…”