Ultrafast dynamics under high-pressure

Abstract

High-pressure is a mechanical method to regulate the structure and internal interaction of materials. Therefore, observation of properties’ change can be realized in a relatively pure environment. Furthermore, high-pressure affects the delocalization of wavefunction among materials’ atoms and thus their dynamics process. Dynamics results are essential data for understanding the physical and chemical characteristics, which is valuable for materials application and development. Ultrafast spectroscopy is a powerful tool to investigate dynamics process and becoming a necessary characterization method for materials investigation. The combination of high-pressure with ultrafast spectroscopy in the nanocosecond~femtosecond scale enables us to investigate the influence of the enhanced interaction between particles on the physical and chemical properties of materials, such as energy transfer, charge transfer, Auger recombination, etc. Base on this point of view, this review summarizes recent progress in the ultrafast dynamics under high-pressure for various materials, in which new phenomena and new mechanisms are observed.
In this review, we describe in detail the principles of in situ high pressure ultrafast dynamics probing technology and its field of application. On this basis, the progress of the study of dynamic processes under high-pressure in different material systems is summarized. An outlook on in situ high-pressure ultrafast dynamics research is also provided.

Ultrafast Dynamics Across Pressure‐Induced Electronic State Transitions, Fluorescence Quenching, and Bandgap Evolution in CsPbBr3 Quantum Dots

“…The probe and pump lights were kept overlapped in the sample chamber. [ 57 , 58 , 77 ] Detection was carried out using a charge‐coupled device (CCD) detector. The acquired fs‐TA spectroscopy was globally fitted using the CarpetView software.…”

“…[ 75 , 76 ] By combining in situ high‐pressure XRD, PL, Abs, and fs‐TA spectroscopy detection techniques, the intricate connection between the microscopic ultrafast carrier dynamics and macroscopic optical behaviors can be explored comprehensively. [ 77 ] This advancement enabled the systematic study of optical physics mechanisms in materials.…”