Abstract: The development of ultralong organic room temperature afterglow (UL-RTA) materials have inspired tremendous attention owing to their great potential applications in optoelectronic areas. However, it remains a significant challenge to achieve UL-RTA, especially with activation by visible light. Herein, we reported an effective strategy to achieve excitation wavelength-dependent UL-RTA behavior covering a wide range from UV to visible light region via embedding the PAHs (TP and CN) into BA matrix. Importantly, blue afterglow of TP-BA can show duration times up to 65 s excited at 254 nm, which display ultralong lifetime of 6744 ms. More impressively, the green afterglow of CN-BA exhibit duration times up to 25 s with an ultralong lifetime of 3.72 s and an afterglow quantum yield of 11.06% upon visible light excitation of 420 nm. Such outstanding afterglow characteristics have been rarely seen so far. Experiments and theoretical calculations demonstrate that the aforementioned UL-RTA behavior is mainly because that HBA matrix provide a tight and rigid environment for TP molecules to suppress their nonradiative transitions. And their interesting excitation-dependent perfomance covering a wide range from UV to visible light region of TP-BA are because that the coexistence of the isolated individuals and J-aggregation of TP molecules supply more and efficient ISC pathways and the small contribution of BA@200°C. Inspired by these outstanding features, anti-counterfeiting and multilevel information encryption applicatioin are demonstrated.
