Spatial Isolation Induced Solid‐State Emissive Chiral Carbon Dots for Achieving Efficient Circularly Polarized Light Emission and Detection

Abstract Chiral carbon dots (C‐dots) are highly promising for constructing advanced chiroptical materials with significant applications, especially in circularly polarized light (CPL)‐related application scenarios. Herein, solid‐state emissive chiral C‐dots are facilely synthesized through solvent‐free pyrolysis using 4,4‐dibromotriphenylamine, (R/S)‐1,1′‐binaphthyl‐2,2′‐diamine and p‐phenylenediamine as precursors. Structural and theoretical analyses demonstrate that reasonable interlayer spacing and extended conjugated structures effectively promote solid‐state emission. The chiral C‐dots exhibit intense Cotton effect and intrinsic CPL emission, with dissymmetry factors (| g _lum |) ≈6.9 × 10 ⁻⁴ . Significantly, introducing achiral helical polyacetylene triggers reciprocal chirality transfer, leading to enhanced CPL emission with over 80‐fold amplification of | g _lum |. More importantly, the induced chirality is further transferred to a series of achiral C‐dots via circularly polarized energy transfer, achieving full‐color CPL emissions with | g _lum | up to 10 ⁻² . Notably, with chiral C‐dots as active layer, efficient CPL photodetectors are fabricated, achieving a maximum photocurrent dissymmetry factor (| g _ph |) of 0.78 and outstanding CPL detection responsivity of 0.16 A W ⁻¹ . As far as known, this is the first report of CPL photodetector based on chiral C‐dots. This pioneering work opens up the possibility of detecting CPL with 0D chiral luminescent nanomaterials on highly integrated photonic platforms.