Unlocking efficient near-infrared circularly polarized phosphorescence reaching 800 nm via rational molecular engineering of cyclometalated Pt(II) complexes

Abstract

Achieving efficient near-infrared (NIR) circularly polarized phosphorescence (CPP) remains challenging. We report a promising strategy to design efficient NIR chiral Pt(II) complexes via ligand regulation and planar chirality formation. The point chirality of the bridging ligand enables exceptional diastereoselectivity promoted by the intramolecular Pt-Pt interaction, affording pure binuclear Pt(II) enantiomers that exhibit unprecedented NIR CPP reaching 800 nm, photoluminescence quantum yields of up to 35.4%, short lifetimes within 2 μs, and luminescence dissymmetry factors of ~3.9 × 10-3.