New progress has been made in the research of circularly polarized luminescent materials

Recently, the team of Professor Ma Xiao of the School of Chemistry and Molecular Engineering of East China University of Science and Technology and the Feringa Nobel Prize Scientists Joint Research Center and the laser physics and quantum regulation team of the School of Physics have made important progress in the research of circularly polarized luminescence (CPL) materials, and the relevant results were published in the National Science Review with the title “Size Effect of Circularly Polarized Luminescent Signals of Matter”.

Circular polarized luminescent model. Photo courtesy of the research team

Scientists often use electron microscopy, polarimeters, or other spectroscopic methods to analyze and discuss chiral or asymmetric properties of chiral materials. However, with the development of CPL spectroscopy, CPL spectroscopy has gradually become the main technical means to characterize the chirality of luminescent materials. In this study, the researchers found that in addition to chiral structures that can induce CPL luminescence, non-chiral ordered structures can also have a significant effect on CPL signaling. The influence of these chiral structures on CPL signals is mainly reflected in the microscopic or macroscopic particle scale, which is difficult to eliminate by simple and universal macroscopic measurement strategies.

On this basis, the research team established a CPL luminescence model based on the ordered dielectric scale effect through design experiments, and quantified the influence of dielectric orderliness on the spontaneous emission CPL signal of materials. The results show that the scale effect of ordered media has a greater impact on the CPL signal of luminescent materials than that of potential chiral excited states of molecules. The study also found that the measured entropy in the measurement is the dominant factor determining the isotropy and anisotropy of the CPL signal. (Source: China Science News, Zhang Shuanghu, Li Chenyang)

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