Concentration‐Switchable Assembly of Carbon Dots for Circularly Polarized Luminescent Amplification in Chiral Logic Gates and Deep‐Red Light‐Emitting Diodes

Abstract Stimuli‐responsive circularly polarized luminescent (CPL) materials are expected to find widespread application in advanced information technologies, such as 3D displays, multilevel encryption, and chiral optical devices. Here, using R‐/S‐α‐phenylethylamine and 3,4,9,10‐perylenetetracarboxylic dianhydride as precursors, chiral carbon dots (Ch‐CDs) exhibiting bright concentration‐dependent luminescence are synthesized, demonstrating reversible responses in both their morphologies and emission spectra. By adjusting Ch‐CD concentration, the switchable wavelength is extended over 180 nm (539–720 nm), with the maximum quantum efficiency reaching 100%. Meanwhile, upon increasing Ch‐CD concentration, the emission wavelength red‐shifts, while the chirality of the assembled nanoribbons is synchronously amplified, ultimately achieving CPL at 709 nm and a maximum luminescence asymmetry factor of 2.18 × 10 −2 . These values represent the longest wavelength and the largest g lum reported for CDs. Considering the remarkable optical properties of the synthesized Ch‐CDs, multilevel chiral logic gates are designed, and their potential practical applications are demonstrated in multilevel anti‐counterfeiting encryption, flexible electronic printing, and solid‐state CPL. Furthermore, deep‐red chiral electroluminescence light‐emitting diodes (EL‐LEDs) are prepared using these Ch‐CDs, achieving an external quantum efficiency of 1.98%, which is the highest value reported to date for CDs in deep‐red EL‐LEDs, and the first report of chiral electronic devices based on CDs.