Nd-Doping Induced Structural Transformation and Broadband Emission in All-Inorganic Perovskites

作者：Jing Wu, Wanru Kong, Jincheng Jiang, Min Li, Tongqing Sun, Xiujuan Zhuang · 发表于：Chinese Physics B · 年份：2026 · DOI：10.1088/1674-1056/ae82de · 研究领域：Perovskite Materials and Applications、2D Materials and Applications、Strong Light-Matter Interactions

Abstract Ion doping is recognized as a practical approach for tuning the crystal structure and optoelectronic properties of metal halide perovskite materials. In this work, Nd-doped cesium lead halide perovskite samples were synthesized via a chemical vapor deposition (CVD) method. The introduction of Nd 3+ was found to modify the growth pathway of the perovskite, leading to a transformation from three-dimensional (3D) CsPb(Cl/Br) 3 to two-dimensional (2D) CsPb 2 (Cl/Br) 5 . Structural transition results in a softened lattice and a markedly enhanced electron-phonon coupling strength, thereby inducing a broad self-trapped exciton (STE) emission centered at 698 nm with a full width at half maximum (FWHM) of 187 nm. The electron-phonon coupling strength was quantitatively evaluated through temperature-dependent photoluminescence spectroscopy, yielding a Huang-Rhys factor of 8.7. Furthermore, by varying the ratio of CsBr to PbCl 2 precursors, qualitative modulation of the STE luminescence intensity was achieved. It is demonstrated that ion doping can extend beyond conventional substitutional effects, inducing significant structural and dimensional changes in perovskite materials. This finding offers a new strategy for structural engineering of perovskites via doping.