Highly crosslinked polymeric matrix for efficient ultralong dual-mode afterglow with multiple responses

Organic persistent luminescence (OPL) materials have enjoyed a long term research interest for promising applications in optical encryption, bio-imaging and optoelectronic devices. However, to achieve further promotion in afterglow efficiency and stability for responsive OPL systems are still challenging. Herein, an efficient responsive OPL system is prepared by doping an acridine derivative in a highly crosslinked poly(N-methylol acrylamide) matrix. The resulted doped polymeric system exhibits persistent phosphorescence and thermally activated delayed fluorescence with a high afterglow quantum yield up to 82.8% under ambient conditions without photoactivation for oxygen consuming. Benefitted from the dense structure brought by the chemical crosslinking with rich hydrogen bonding, the system exhibits good resistance to different organic solvents and shows response to water without complete afterglow quenching. Moreover, the dual-mode delayed emission consisting of persistent delayed fluorescence and phosphorescence provides time- and temperature-dependent OPL color. Benefitted from the stable feature, high afterglow efficiency and multiple stimuli-responses, the system can serve as OPL inkjet printing, providing potential applications in anti-counterfeiting and data-storage.