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Updated: Aug 6, 2026

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Pressure-Engineered Excitons Enable Intensified Narrowband Emission Across Visible Spectrum in Two-Dimensional Lead
Lei Li1,2, Shuo Wang1, Siya Qi1
1Key Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, School of Physics Science and Information Technology, Liaocheng University, Liaocheng, China.
Abstract:
Two-dimensional (2D) lead halides are promising optoelectronic materials, yet precise control over their exciton dynamics remains challenging. Herein, high pressure is employed to engineer excitonic behavior in 2D PMA2PbBr4 (PMA = C6H5CH2NH3 +). Initial compression induces dominant interlayer contraction with minimal intralayer distortion, suppressing electron-phonon coupling and enhancing free exciton (FE) emission with an asymmetric line shape. PMA2PbBr4 shows a visible photoluminescence shift from blue to violet. At higher pressures, pronounced structural distortion promotes the formation of self-trapped excitons, generating new broadband emission. Building on these findings, halogen substitution is applied to further introduce chemical pressure, enhancing the emission sensitivity to external force. The PMA2PbX4 (X = Br, I) series exhibits widely tunable and intensified FE emission across the visible range, spanning from violet to red-orange. These findings highlight the potential of 2D lead halides as pressure-responsive materials, highlighting potential in sensing, information encryption, and anti-counterfeiting.
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