Issue 17, 2025

Dual switching of dielectric and SHG triggered by thermal driven helical axis transformation with fluorescence characteristics

Abstract

Organic–inorganic hybrid perovskites (OIHPs) have aroused widespread interest because of their exceptional performance in thermal, optical, electric, and information storage applications. However, it is relatively rare for OIHPs to respond to both temperature and light, which limits their multifunctional applications. Therefore, in this article, by incorporating [N,N-dimethyl-pyrrolidinium]+ as the cation, in combination with lead halide exhibiting semiconducting properties, two OIHPs (N,N-dimethyl-pyrrolidinium)PbCl3 (compound 1) and (N,N-dimethyl-pyrrolidinium)PbBr3 (compound 2) were successfully obtained. These compounds not only exhibit two phase transitions but also demonstrate second harmonic generation (SHG) and dielectric switching near 270 K and 278 K, respectively. Surprisingly, due to the presence of helical axes in the inorganic framework, both compounds crystallize in the chiral P61 space group below room temperature. The first phase transition results from the transformation of the 61 to the 63 screw axes in the inorganic framework, while the second phase transition is attributed to the order-to-disorder transformation of cations. This study provides a new perspective for designing polar multifunctional switchable phase materials.

Graphical abstract: Dual switching of dielectric and SHG triggered by thermal driven helical axis transformation with fluorescence characteristics

Supplementary files

Article information

Article type
Paper
Submitted
12 Oct 2024
Accepted
18 Mar 2025
First published
18 Mar 2025

J. Mater. Chem. C, 2025,13, 8745-8752

Dual switching of dielectric and SHG triggered by thermal driven helical axis transformation with fluorescence characteristics

Y. Zhu, B. Deng, J. Jin, Y. Wu, Y. Zhao, X. Chen, X. Hua and H. Duan, J. Mater. Chem. C, 2025, 13, 8745 DOI: 10.1039/D4TC04379K

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