Engineering LE-CT State Synergy in Aminoboranes for Single Molecule White Light Emission and Dual-Mode Chiroptical/Phosphorescence Output.

Axially chiral aminoboranes that integrate multiple emissive functions within a single molecular framework are reported. These compounds exhibit dual emission, originating from two electronically distinct excited states: high-energy fluorescence from a binaphthyl-localized state and low-energy emission from an aminoborane-centered charge-transfer state. Circularly-polarized luminescence is observed exclusively from the high-energy channel, directly linking chiroptical activity to the binaphthyl-localized excited state. Restricting intramolecular motion enhances high-energy emission. In contrast, incorporation into a rigid polymer matrix enables efficient triplet harvesting, affording persistent room-temperature phosphorescence with lifetimes on the order of seconds. This RTP feature further enables time-gated optical encoding, highlighting the potential of these materials for anti-counterfeiting applications. The combination of white-light emission, selective circular polarization, and ultralong phosphorescence in a single scaffold establishes a molecular design strategy for multifunctional chiroptical materials.