Atomic‐Scale Structural Distortion Drives Exciton Localization for Near‐Unity Photoluminescence in Copper–Iodide Clusters
Abstract
Abstract Engineering structural distortions presents a powerful strategy for tailoring the optoelectronic properties of luminescent materials, while a fundamental understanding of how atomic‐scale distortions govern photoluminescence in copper‐iodide clusters has remained elusive. Herein, we report a model van der Waals solid based on copper–iodide clusters, where two vertically oriented and alternately arranged [Cu 2 I 4 ] 2− clusters are assembled via protection and interaction afforded by peripheral long‐alkyl‐chain cetyltrimethylammonium bromide ligands. This unique architecture affords a cooperative distortion response and exceptional buffering capacity, enabling precise control and direct probing of atomic‐scale structural distortions under pressure. We demonstrate that hydrostatic pressure induces controlled atomic distortions and an isostructural phase transition, which collectively enhance exciton localization. This leads to a dramatic amplification of self‐trapped emission, boosting the photoluminescence quantum yield from 32.25% to near‐unity (99.82%). Our work establishes atomic‐distortion engineering as a general principle for achieving ultimate control over light emission in hybrid semiconductors.
Article Details
Authors (13)
Haifeng Zhu
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
Shengrong He
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
Zhihao Xiao
Guangming Niu
Yanxue Yin
State Key Laboratory of Superhard Materials Synergetic Extreme Condition High‐Pressure Science Center College of Physics Jilin University 2699 Qianjin Street Changchun 130012 P.R. China
Shengqiao Wang
State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOE Key Laboratory of Material Simulation Methods & Software of MOE School of Materials Science and Engineering Jilin University 2699 Qianjin Street Changchun 130012 P.R. China
Laizhi Sui
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source
Xinyi Yang
School of Materials Science and Engineering, Tianjin University, Tianjin, China.
Bo Zou
State Key Laboratory of High Pressure and Superhard Materials, College of Physics
Lijun Zhang
Key Laboratory of Functionalized Molecular Solids of Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science
Zhennan Wu
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
Yu Zhang
Xiangya Hospital, Central South University Changsha China
Xue Bai