Polymer-Based Long-Lived Phosphorescence Materials over a Broad Temperature Based on Coumarin Derivatives as Information Anti-Counterfeiting

The development of new polymer-based room-temperaturephosphorescencematerials is of great significance. By a special molecule design anda set of feasible property-enhancing strategies, coumarin derivatives(CMDs, M-a-M-f) were doped into polyvinylalcohol (PVA), polyacrylamide (PAM), corn starch, and polyacrylonitrile(PAN) as information anti-counterfeiting. CMDs-doped PVA and CMDs-dopedcorn starch films showed long-lived phosphorescence emissions up to1246 ms (M-a-PVA) and 697 ms (M-a-corn starch),reaching over 10 s afterglow under naked eye observation under ambientconditions. Significantly, CMDs-doped PAM films can display long-livedphosphorescence emissions in a wide temperature range (100-430K). For example, the M-e-PAM film has a phosphorescencelifetime of 16 ms at 430 K. The use of PAM with the strong polarityand rigidity has expanded the temperature range of long-life polymer-basedphosphorescent materials. The present long-lived phosphorescent systemsprovide the possibility for developing new polymer-based organic afterglowmaterials with robust phosphorescence.