Distinct Excitonic Emissions in 2D (C₇H₇N₂)₂PbX₄ (X = Cl, Br) under Compression

Zhang, Hai; Zhang, Peijie; Xie, Chenlong; Han, Jiang; Xu, Bin; Quan, Zewei

2023-11-01

10.1002/advs.202305597

ADVANCED SCIENCE   影响因子和分区

2198-3844

Two dimensional (2D) hybrid metal halides (HMHs) usually exhibit free excitonic (FE) emission, and self-trapped excitonic (STE) emission can also be achieved by adopting appropriate halogens and organic cations. Recently, significant efforts have been made to modulate and then clarify the transformation and connection between these two types of excitonic emissions in 2D HMHs. In this study, intriguing pressure-tuned transitions between FE emission and STE emission are observed in 2D (C7H7N2)(2)PbCl4. In contrast, only FE emissions with tunable emission energies are observed in 2D (C7H7N2)(2)PbBr4 which possesses a similar structure with (C7H7N2)(2)PbCl4 under compression. Such distinct halide-dependent optical responses under pressure are experimentally revealed to arise from the intricate interplay among several factors in these HMHs, including the stiffness of the structure, the Coulomb force between the organic cations and the inorganic octahedra, and the magnitude of inorganic octahedral distortion. These high-pressure optical explorations can unravel the underlying interrelationship between the crystal structure and excitonic emission in 2D HMHs.

free excitonic emission high pressure hybrid metal halides self-trapped emission

SCI ; EI

英语

第一 ; 通讯

This work was supported by by the National Natural Science Foundation of China (NSFC) (Grant 52072166), the Guangdong Science and Technology Department (Grant 2022A1515010918), and the Shenzhen Science and Technology Innovation Committee (Grants RCJC202106[52072166] ; National Natural Science Foundation of China (NSFC)[2022A1515010918] ; Guangdong Science and Technology Department[RCJC20210609104441068]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001107532200001

WILEY

20234715089728

Crystal structure ; Positive ions

Chemical Products Generally:804 ; Crystal Lattice:933.1.1

2-s2.0-85177168548

Web of Science

Southern Univ Sci & Technol SUSTech, Dept Chem, Shenzhen 518055, Guangdong, Peoples R China

Zhang, Hai,Zhang, Peijie,Xie, Chenlong,et al. Distinct Excitonic Emissions in 2D (C₇H₇N₂)₂PbX₄ (X = Cl, Br) under Compression[J]. ADVANCED SCIENCE,2023,11(4).

Zhang, Hai,Zhang, Peijie,Xie, Chenlong,Han, Jiang,Xu, Bin,&Quan, Zewei.(2023).Distinct Excitonic Emissions in 2D (C₇H₇N₂)₂PbX₄ (X = Cl, Br) under Compression.ADVANCED SCIENCE,11(4).

Zhang, Hai,et al."Distinct Excitonic Emissions in 2D (C₇H₇N₂)₂PbX₄ (X = Cl, Br) under Compression".ADVANCED SCIENCE 11.4(2023).