Pressure Treatment Induces Structural Symmetry Breaking to Narrow the Bandgap and Enhance Emission in UiO-66.

Metal-organic frameworks (MOFs), with a tunable porous structure and unique optical properties, exhibit excellent application potential in photocatalysis, fluorescent sensing, analytical detection, and biomedicine. Among numerous MOFs, UiO-66 is widely studied for its remarkable thermal and chemical stability, yet its optical performance is severely limited by a large bandgap and low charge transfer efficiency. This study proposes a pressure treatment strategy to regulate the conformation of octahedral secondary building units (SBUs) in UiO-66.