Chirality Transfer in Carbon-Dot Composited Sol-Gel Systems for Excitation-Dependent Circularly Polarized Luminescence.

In situ control of a circularly polarized luminescent (CPL) signal is desirable but rarely addressed. Even to compare with traditional chemical regulations, controlling the CPL signal at the material level using simple physical manipulation (such as photoexcitation) can be more convenient and preferable. In this work, we have constructed carbon dot-based composite luminescent materials with CPL activity. The materials can exist in the sol-gel state in a mixture solvent by chiral co-assembly, and chirality transfer occurred in the supramolecular assemblies and induced the CPL activity. Owing to the unique luminescent properties of the carbon dot component, the obtained CPL signal of the composite system is therefore excitation-dependent. The control ability of the CPL signal may allow the composite materials to find potential usage in advanced chirality-related fields.