Molecular hybridization of multiple resonance cores and responsive heterocycles for versatile optoelectronic and sensing applications

Multi-functional materials that integrate high color purity with environmental responsiveness are highly desirable for next-generation smart luminescent systems. Herein, a series of novel luminescent molecules are developed via a molecular hybridization strategy, wherein the multiple resonance (MR) core, DABNA, is integrated with classic HBT/HBO heterocycles. Owing to the incorporation of the DABNA fragment, the highly emissive, narrow-band delayed fluorescence intrinsic to MR systems is successfully retained. Concurrently, benefiting from the inherent microenvironment sensitivity of the HBT/HBO skeletons, highly tunable photophysical behaviors in response to external stimuli are achieved. Specifically, distinct acid-base (pH)-triggered switching is demonstrated, and highly sensitive luminescent responses to a Tabun analogue are realized. Furthermore, room-temperature phosphorescence (RTP) is successfully activated when these molecules are incorporated into a highly crystalline TPA matrix via a host-guest doping strategy. Their viability as active emitters is also validated through preliminary electroluminescence explorations, providing a valuable proof of concept for further OLED applications. This work represents a versatile design strategy for the development of advanced luminescent materials with multi-dimensional responsiveness.