Color-Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Circularly polarized luminescence (CPL) materials are currently drawing rapidly increasing interest. However, constructing color-tunable CPL materials is still a big challenge, primarily due to the lack of simple, powerful, and universal preparation strategies. In this contribution, color-tunable CPL emissions are easily realized by taking helical polyacetylenes as fluorescence converters. The investigated helical polyacetylenes are prepared by solution polymerization of a substituted acetylenic monomer with cholesteryl pendant. The prepared polymer exhibits dynamically reversible solvatochromism performance in different solvents, owing to the change of conjugated length of polymer main-chains. More excitingly, when circularly polarized light with blue emission passes through the as-prepared helical polyacetylene with different conjugated lengths, multicolor CPL emissions of cyan, green, and orange are obtained, with high dissymmetry factors (g(lum)) in the range of 10(-2)-10(-1). Also notably, neither any covalent nor noncovalent interaction is required during this CPL color-tuning process. The present study provides a new insight for developing multicolor CPL materials.