AUTHOR=Nagata Yuya , Mori Tadashi 

TITLE=Irreverent Nature of Dissymmetry Factor and Quantum Yield in Circularly Polarized Luminescence of Small Organic Molecules

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00448

DOI=10.3389/fchem.2020.00448

ISSN=2296-2646

ABSTRACT=<p>Recently, a rational modification of small organic molecules has attracted considerable attention for designing advanced materials with enhanced circularly polarized luminescence (CPL) activity. A particular emphasis has been placed on fully allowed π-π<sup>*</sup> transition of rigid aromatic systems, due to their relatively superior emission properties or quantum yields of luminescence (Φ<sub>lum</sub>). However, their dissymmetry factors (<italic>g</italic><sub>lum</sub>), differential left and right CPL intensities, are typically disappointingly low at least in one to two orders of magnitude. Truly useful organic CPL materials, rated by a circular polarization luminosity index (Λ<sub>CPL</sub>) per single molecule, possess both |<italic>g</italic><sub>lum</sub>| and Φ<sub>lum</sub> values high. However, how to improve these two factors simultaneously with a proper molecular design is an open question. Here, we addressed this issue by theoretical and statistical inspection on a possible relation of the <italic>g</italic><sub>lum</sub> and Φ<sub>lum</sub> values. According to the analysis, we propose simple, unpretentious, yet pertinent guidelines for designing superior organic CPL materials for the future with large Λ<sub>CPL</sub> values.</p>