Amplified circularly polarized luminescence of chiral lanthanide-based chains through helical assembly†

Abstract

Accurately designing and controlling the synthesis of circularly polarized luminescent (CPL) materials with both large asymmetry factor (g_lum) and high quantum yield (Φ_lum) values is a key scientific challenge. In this study, chiral ligands and luminescent π-conjugated systems are utilized as mixed ligands to form chiral helical polymers R/S-Ln-phen (Ln = Eu/Tb) by the regulation of intramolecular and intermolecular interactions. This approach aims to amplify the chirality and enhance luminescence efficiency. The compounds R/S-Eu-phen and R/S-Tb-phen demonstrated extremely high Φ_lum (86.88% for R/S-Eu-phen and 88.93% for R/S-Tb-phen) and relatively large g_lum (≈10⁻³) values.