writer：Xiaoyan Peng, Jiajun Chen, Rui Xu, Jin Feng, and Tao Zhou*
keywords：fluorescence, laser patterning, laser direct writing, rewritable, polymer
source：期刊
specific source：Industrial & Engineering Chemistry Research, 2022, 61, 6468–6480
Issue time：2022年
There is an urgent need to broaden the new horizons of laser direct writing (LDW). Herein, the programmable rewriteable laser fluorescent patterning on polymers was realized by doping dyes and CO2 laser LDW for the first time. The prepared fluorescent patterns had high brightness and high precision under 365 nm UV light. Importantly, the designed patterns could repeatedly be rewritten using CO2 laser. A series of PMMA doped with quinacridone (DClQA) dye were prepared to perform CO2 laser LDW and characterizations. ATR-FTIR revealed no generation of new compounds after LDW. TGA-FTIR-GC-MS indicated that the samples could be decomposed into complex products at high temperatures, and it also revealed no generation of any fluorescent substances. We confirmed the mechanism of the laser-induced fluorescence is that the dissociated DClQA molecules caused by the CO2 laser are more inclined to form hydrogen bonds with PMMA macromolecules so that they cannot be re-stacked and re-crystallized, leading to the disappearance of the intrinsic fluorescence quenching phenomenon of DClQA; thus, the fluorescence is naturally emitted. Benefitting from high precision, rewriteable, and programmability, laser fluorescent patterning will have good application prospects in the field of polymer products anti-counterfeiting.