Structure-emission property relationship of bilayer 2D hybrid perovskites

Prof. Philip C.Y. Chow's group recently published an article in Journal of the American Chemical Society as a cover article, which reveals the structure-emission relationship of bilayer two-dimensional metal halide perovskites (2D-PVK). These novel organic-inorganic (hybrid) materials show promising properties for future opto-electronic (e.g. low-cost LEDs, solar cells) as well as opto-spintronic applications. However, the underlying structure-emission property relationship of these materials remains poorly understood, especially for those with multiple octahedral layers (n > 1). This study uses a combination of theoretical and experimental characterizations to reveal the structure-emission relationship of bilayer (n = 2) 2D-PVK single crystals in both Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) phases, revealing that the selection of organic spacer cations requires more than just considering their rigidity and length, but a detailed analysis of its effect on overall structural distortion, defect formation, and centrosymmetry is necessary for the engineering of high-performance 2D-PVKs for future applications.

The research was led by Yumeng Song (HKU Mech. Eng. PhD student) and carried out in collaboration with Prof. Jun Yin's team at Hong Kong Polytechnic University. It was accepted by JACS on April 18, 2025.

Article in Journal of the American Chemical Society

Link: https://pubs.acs.org/doi/10.1021/jacs.5c04417

Y. Song, Y. Zhou, C. Chen, K. Fan, Z. Wang, Y. Guo, Z. Chen, L. Mao, J. Yin, P. C. Y. Chow, Structure–Emission Property Relationship of Bilayer 2D Hybrid Perovskites. J. Am. Chem. Soc. (2025), doi:10.1021/jacs.5c04417