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We develop techniques to study the temperature dependent localization,thermalization, and the effects of phonon scattering on the excitons in halideperovskites from the analysis of the emission spectra. The excitonic Urbachedge, when inferred from the low energy tails of the temperature dependentluminescence spectra, is shown to be sensitive to the electron distribution andthermalization. A method to observe the Urbach focus is devised for halideperovskites where the temperature dependence of the excitonic gap is anomalous.The value of the zero-point bandgap renormalization is inferred to be about 33meV. This small value of the bandgap renormalization rules out the formation ofsmall polarons and points to weak electron-phonon coupling. The experiments areperformed on the nanosheets of the archetypal halide perovskite, CsPbBr$_3$.

Carrier thermalization and zero-point bandgap renormalization in halide perovskites from the Urbach tails of the emission spectrum