Superlattice-Induced Superfluorescence in Quasi-2D Metal Halide Perovskites

Document Type

Article

Publication Date

1-1-2025

Abstract

This paper reports the role of the superlattice (crystal) structure of the quasi-two-dimensional (2D) perovskite (PEA2(FAPbBr3)n-1PbBr4) in room-temperature superfluorescence. Through steady-state and time-resolved spectroscopy, we observe a narrow spectral width, a quadratic emission dependence on the excitation fluence, and a burst of emission after a time delay in quasi-2D perovskite, key indicators of superfluorescence. Notably, bulk three-dimensional (3D) perovskite (FAPbBr3) does not demonstrate these features, suggesting that the quasi-2D structure containing superlattices is a requirement for superfluorescence. The formation of superlattices in quasi-2D perovskite thin films was confirmed using scanning transmission electron microscopy (STEM). These results suggest that the search for new superfluorescent materials should prioritize exploring analogous materials with well-defined superlattice structures.

Publication Title

ACS Photonics

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