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Updated: Feb 20, 2026
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Crystal structures and optical properties of two layered lead halide phosphites Pb3(HPO3)Cl4·H2O and
Zong-Jie Zhao1,2, Yu-Zheng Yan3, Jia-Jian Fu1
1School of Resources & Chemical Engineering, Sanming University, Sanming, 365004, PR China. zjhsmu@foxmail.com.
Abstract:
Two new all-inorganic lead halide phosphites, Pb3(HPO3)Cl4·H2O and Pb3(HPO3)2Cl2·H2O, have been synthesized and structurally characterized as layered frameworks constructed from distorted Pb-O(H2O) polyhedra linked by pseudo-tetrahedral HPO3 groups, with interlayer Cl- ions providing charge balance and imparting intrinsic structural anisotropy. UV-vis diffuse reflectance spectra analyzed using Tauc's fitting show that both compounds are direct wide-band-gap materials, with optical band gaps of 4.20 eV for Pb3(HPO3)Cl4·H2O and 4.14 eV for Pb3(HPO3)2Cl2·H2O, indicating good transparency in the UV region. Birefringence measurements at 546 nm using a Berek compensator yield Δn ≈ 0.033 and 0.057 for Pb3(HPO3)Cl4·H2O and Pb3(HPO3)2Cl2·H2O, respectively, demonstrating useful optical anisotropy for polarization-dependent applications. Density functional theory calculations reproduce the wide-gap insulating character of both phases and predict birefringence values in good agreement with experiment, supporting their identification as phosphite-based candidates for UV/visible birefringent optical crystals.
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