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(a) Proposed Jablonski diagram for carrier dynamics and optical transitions in the PEA family of ⟨100⟩ 2D halide perovskites. Band to band transitions create the narrow emission (NE) of free excitons. Electron trapping at the VX defect site and exciton self-trapping can result in broad emission, depending on the system; (b) Attribution of the emission bands to the transitions for the PEA2BX4 system.
