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<p>Understanding the emission process of Stokes-shifted broad photoluminescence (PL) in HOIPs is important for both fundamental science and applications. We present here results of temperature-dependent PL, X-ray diffraction, and Raman studies of solution-processed (BA)<sub>2</sub>PbCl<sub>4</sub> flakes and powder prepared from these flakes to unveil the structural signature of the self-trapped exciton mechanism that explains the observed Stokes shift of broad PL in HOIPs. We also present sharp and intense PL spectra obtained from nanofilms of Lead-Formate perovskites prepared from the Langmuir monolayer of Stearic acid over solution of these flakes. A prominent position shift of broad PL peak and X-ray diffraction peak occurs only in 2D flakes as the temperature decreases, and laser-excitation intensity increases. Such redshift in PL peak position does not happen in 3D flake-powder. In 2D perovskite nanofilms, broad PL disappears as pseudo-halide Formate substitutes for Chlorine. Results on these three systems enable us to decipher the role of composition, dimensionality, and structure on the PL of HOIPs.</p>

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Structural signature in Stokes-shifted broad emission of solution-processed hybrid lead perovskites

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  • 发表日期：

    2025年12月6日

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  • Subhadip Chowdhury,
  • Mrinmay K. Mukhopadhyay,
  • Satyaban Bhunia,
  • Milan K. Sanyal

摘要

Understanding the emission process of Stokes-shifted broad photoluminescence (PL) in HOIPs is important for both fundamental science and applications. We present here results of temperature-dependent PL, X-ray diffraction, and Raman studies of solution-processed (BA)2PbCl4 flakes and powder prepared from these flakes to unveil the structural signature of the self-trapped exciton mechanism that explains the observed Stokes shift of broad PL in HOIPs. We also present sharp and intense PL spectra obtained from nanofilms of Lead-Formate perovskites prepared from the Langmuir monolayer of Stearic acid over solution of these flakes. A prominent position shift of broad PL peak and X-ray diffraction peak occurs only in 2D flakes as the temperature decreases, and laser-excitation intensity increases. Such redshift in PL peak position does not happen in 3D flake-powder. In 2D perovskite nanofilms, broad PL disappears as pseudo-halide Formate substitutes for Chlorine. Results on these three systems enable us to decipher the role of composition, dimensionality, and structure on the PL of HOIPs.