Chiral Photochromic Carbon Dots with Photoactivated Radical Emission, Circularly Polarized Luminescence and Organic Afterglow

and an afterglow lifetime up to 265 ms. Moreover, owing to the photo-induced formation of NI-radical anions, photochromism from colorless to yellow and steady-state emission from blue to yellow were also observed, and these optical responses are reversible and highly sensitive to stimuli of light, temperature, humidity, and atmosphere. With the rich and dynamic photophysical features of the stimulus-responsive chromic and luminescent chiral nanomaterial, advanced anti-counterfeiting and multilevel information encryption on flexible substrates were realized, representing a remarkable step forward in integrating radical luminescence, CPL, photochromism, afterglow, and stimuli-response together for constructing multifunctional chiral nanomaterials.