1. Investigation on broadband emission of two-dimensional melamine lead iodide perovskite (2D-C 3 H 8 N 6 PbI 4 ): An experimental and theoretical approach.
- Author
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Shellaiah M, Lin WL, Raghunath P, Sun KW, and Lin MC
- Abstract
Novel two-dimensional melamine lead iodide perovskite (2D-C
3 H8 N6 PbI4 ) is synthesized to investigate its crystallinity, optical band gap and broadband emission properties and to make comparisons with 2D-C3 H8 N6 PbCl4 /2D-C3 H8 N6 PbBr4 perovskites. Both experimental and density functional theory (DFT) interrogations on 2D-C3 H8 N6 PbX4 (X = Cl, Br and I) are conducted. The crystal structure, morphology and percentile of Pb and halide elements are confirmed using scanning electron microscope (SEM), and energy dispersive spectrum (EDS), powder/single crystal X-ray diffraction (PXRD/SXRD), DFT and X-ray crystallography simulations. The optical band gaps of 2D-C3 H8 N6 PbX4 perovskites are determined from the Tauc plot fitting of absorbance and DFT studies. Distinct broadband emission of 2D-C3 H8 N6 PbX4 perovskites between 300 and 800 nm is observed, which can be fitted with multiple Gaussian distributions. The fittings of broad PL spectra from 2D-C3 H8 N6 PbCl4 /2D-C3 H8 N6 PbBr4 perovskites confirm the involvement of both Dexter energy transfer from melamine cation and self-trapped excitons (STEs). However, the broadband emission of 2D-C3 H8 N6 PbI4 is attributed only to the Dexter energy transfer from melamine cation and the absence of STEs is attributed to the larger lattice deformation of 2D-C3 H8 N6 PbI4 . Moreover, the involvement of spin-orbit coupling (SOC) in the energy transfer is clarified to attest that the broadband emission of 2D-C3 H8 N6 PbI4 is distinct among its halide family., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier B.V. All rights reserved.)- Published
- 2023
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