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Liu, Yang; Han, Fei; Li, Fushan; Zhao, Yan; Chen, Maosheng; Xu, Zhongwei; Zheng, Xin; Hu, Hailong; Yao, Jianmin; Guo, Tailiang; Lin, Wanzhen; Zheng, Yuanhui; You, Baogui; Liu, Pai; Li, Yang; Qian, Lei
Nature communications, 06/2019, Volume: 10, Issue: 1Journal Article
An ideal anti-counterfeiting technique has to be inexpensive, mass-producible, nondestructive, unclonable and convenient for authentication. Although many anti-counterfeiting technologies have been developed, very few of them fulfill all the above requirements. Here we report a non-destructive, inkjet-printable, artificial intelligence (AI)-decodable and unclonable security label. The stochastic pinning points at the three-phase contact line of the ink droplets is crucial for the successful inkjet printing of the unclonable security labels. Upon the solvent evaporation, the three-phase contact lines are pinned around the pinning points, where the quantum dots in the ink droplets deposited on, forming physically unclonable flower-like patterns. By utilizing the RGB emission quantum dots, full-color fluorescence security labels can be produced. A convenient and reliable AI-based authentication strategy is developed, allowing for the fast authentication of the covert, unclonable flower-like dot patterns with different sharpness, brightness, rotations, amplifications and the mixture of these parameters.
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