Two light‐driven chiral fluorescent molecular switches, (R,S,R)‐switch 1 and (R,S,R)‐switch 2, are prepared by means of hydrogen‐bonded (H‐bonded) assembly of a photoresponsive (S) chiral fluorescent molecule, respectively with a cyano substitution at different positions as an H‐bond acceptor and an opposite (R) chiral molecule as an H‐bond donor. The resulting two switches exhibit tunable and reversible Z/E photoisomerization irradiated with 450 nm blue and 365 nm UV light. When doped into an achiral liquid crystal, both switches are found to be able to form a CPL tunable luminescent helical superstructure. In contrast to the tunable CPL characteristics of the system incorporating switch 2, exposure of the system incorporating switch 1 to 365 nm and 450 nm radiation can lead to controllable different photostationary CPL behavior, including switching‐off and polarization inversion. In addition, optical information coding is demonstrated using the system containing switch 1.

Stimuli‐triggered changes in the emission color of functional materials are in demand for a variety of potential applications. Herein, a strategy to reversibly phototune fluorescence color in cholesteric liquid crystal (CLC) with self‐organized luminescent helical superstructure via fluorescence resonance energy transfer (FRET) is developed. This dynamic FRET system is constructed by doping with 1,2‐dithienyldicyanoethene‐based chiral fluorescent photoswitch (switch 7) as an acceptor and a conventional coumarin dye C6 as a donor into a nematic liquid crystal (LC) host. The efficient energy transfer from C6 to switch 7 in the LC media, which is evidenced by both of emission color shift and enhanced circularly polarized luminescence, can be modulated on the basis of reversible trans–cis photoisomerization of switch 7 upon visible/UV light irradiations, leading to the emission color change from orange to green. Noteworthily, the FRET efficiency can be significantly improved when CLCs are confined in the polymer microtubes. Preliminary demonstrations of the LC film and LC microtubes array for information display and encryption with ease of electrical operation between planar, homeotropic, and focal conic states or light manipulation are described.

The first example of photo-driven reversible chirality inversion of circularly polarized luminescence in a helical cholesteric superstructure is reported.

The reversible switching of circularly polarized luminescence in a self-organized emissive helical superstructure using 980 nm NIR excitation light with different power intensities is reported for the first time.

Irradiation-wavelength directing…circularly polarized luminescence in emissive self-organized helical superstructures is demonstrated by Jinbao Guo,Q uan Li, and co-workers in their Research Article on page 27158. Phototuning of the turning-off and the polarization inversion of circularly polarized luminescence signals was achieved in the corresponding photostationary state of the same helical superstructure constructed from the light-driven hydrogen-bonded chiral fluorescent molecular switch.