Citation: Xuan Zhu, Lin Zhou, Xiao-Yun Huang, Yan-Ling Luo, Xin Deng, Xin Yan, Yan-Juan Wang, Yan Qin, Yuan-Yuan Tang. (Benzimidazolium)2GeI4: A layered two-dimensional perovskite with dielectric switching and broadband near-infrared photoluminescence[J]. Chinese Journal of Structural Chemistry, ;2024, 43(6): 100272. doi: 10.1016/j.cjsc.2024.100272 shu

(Benzimidazolium)2GeI4: A layered two-dimensional perovskite with dielectric switching and broadband near-infrared photoluminescence

Two-dimensional (2D) lead halide perovskites have attracted tremendous attention due to their outstanding physical properties. However, the presence of toxic lead is a major problem for large-scale applications. Here, we report the synthesis, phase transition, dielectric and photoluminescence (PL) properties of a lead-free 2D Ge-based perovskite (BIM)2GeI4 (BIM = benzimidazolium) which experiences a phase transition at 405 K accompanied by an order-disorder change of organic spacer. Moreover, the step-like dielectric transition near the phase transition temperature makes it suitable for dielectric switching. Meanwhile, (BIM)2GeI4 has a direct bandgap of 2.23 eV and broadband emission from 550 to 1000 nm, implying its unique optical property for potential near-infrared lighting and displaying. This work provides a fresh example for the development of lead-free 2D Ge-based perovskite with potential applications in the fields of optoelectronics and high temperature dielectric switching.
- Lead-free perovskite,
- Photoluminescence,
- Two-dimensional perovskite,
- Lead-free perovskite
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