基于螺烯结构单元的手性纳米石墨烯圆偏振发光研究进展

As a class of conjugated nanocarbon materials with atomically precise structures， chiral nanographenes integrate the excellent optoelectronic properties of graphene and the unique circularly polarized optical characteristics of chiral molecules， thus holding great application potential in cutting-edge fields such as circularly polarized luminescence (CPL) devices， chiral sensing， biological imaging and quantum information.Benefiting from the inherent helical conjugated framework and chiral features， helicenes have served as the core building blocks for constructing highperformance chiral nanographenes， effectively overcoming the bottlenecks of traditional planar nanographenes including intrinsic achirality， poor stability of chiral doping systems and low luminescence dissymmetry factors.This paper systematically reviews the latest research advances in helicene-based chiral nanographenes.It mainly elaborates on the structural construction strategies and CPL modulation mechanisms of helicene-based chiral nanographenes， and summarizes how diverse helicene topologies and conjugated extension degrees affect the CPL dissymmetry factor and fluorescence quantum yield of chiral nanographenes.Furthermore， the current application status of such materials in chiral optoelectronic devices is summarized.Several critical challenges are also discussed， including high cost of chiral resolution， solid-state aggregation-caused quenching， and the difficulty in synergistically optimizing multiple CPL performances.Finally， the future development prospects of chiral nanographene research are outlooked.