Multi-Hydrogen Bonds Enhanced Anchoring Effect Enabling High-Efficiency Blue Phosphorescence, Single-Molecule White Light, and Tunable Colorful Emission with Quantitative Energy Transfer

Ultralong organic room-temperature phosphorescence (RTP) materials, especially high-energy blue emission materials, have attracted tremendous attention but remain difficult to achieve. Here, a strategy based on the multi-hydrogen bonds enhanced anchoring effect is developed to activate single-molecule blue phosphorescence emission with the highest efficiency of 29.79%. Specifically, the aromatic electrophilic directing (AED) effect provides a rational explanation for the structural spectral change. The construction of artificial light-harvesting systems via physical blending achieves on-demand modulation for afterglow color, including white afterglow. Furthermore, cold-white emission is also achieved via a structural π-extension optimization strategy. Moreover, the high transmittance and reversible water-sensitivity render these polymer films with applicability as smart organic optoelectronic materials.