Zheng Xin, Zhu Yangbin, Liu Yang, Zhou Linpeng, Xu Zhongwei, Feng Chen, Zheng Chunbo, Zheng Yueting, Bai Jieyu, Yang Kaiyu, Zhu Dongyan, Yao Jianmin, Hu Hailong, Zheng Yuanhui, Guo Tailiang, Li Fushan
Institute of Optoelectronic Technology, Fuzhou University, Fuzhou 350108, People's Republic of China.
College of Chemistry, Fuzhou University, Fuzhou 350108, People's Republic of China.
ACS Appl Mater Interfaces. 2021 Apr 7;13(13):15701-15708. doi: 10.1021/acsami.1c02390. Epub 2021 Mar 25.
Optical security labels play a significant role in protecting both our wealth and health. However, simultaneously meeting the requirements including low-cost fabrication, easy detection, and high-level security is still challenging for security labels. Here, we design an unclonable anti-counterfeiting system with triple-level security by using the inkjet printing technique, which can be authenticated by naked eyes, a portable microscope, and a fluorescence microscope. These labels are achieved by printing microscale quantum dot (QD) ink droplets on premodified substrates with random-distributed glass microspheres. Due to the unique capillary action induced by the glass microspheres, QDs in the ink droplets are deposited around the microspheres, forming microscale multicircular patterns. Multiple pinning of QDs at the three-phase contact lines appears during the evaporation of the droplet, resulting in the formation of a nanoscale labyrinthine pattern around the microspheres. The nanoscale labyrinth pattern and the microscale multicircular microsphere array, together with the printed macroscopic image, constitute a triple-level progressive anti-counterfeiting system. Moreover, the system is compatible with an artificial intelligence-based identification strategy that allows rapid identification and verification of the unclonable security labels.
光学安全标签在保护我们的财富和健康方面发挥着重要作用。然而，对于安全标签来说，同时满足低成本制造、易于检测和高级安全等要求仍然具有挑战性。在此，我们利用喷墨打印技术设计了一种具有三级安全性的不可克隆防伪系统，该系统可通过肉眼、便携式显微镜和荧光显微镜进行认证。这些标签是通过在预先改性的带有随机分布玻璃微球的基板上打印微米级量子点（QD）墨滴来实现的。由于玻璃微球诱导的独特毛细作用，墨滴中的量子点沉积在微球周围，形成微米级多圆形图案。在液滴蒸发过程中，量子点在三相接触线处多次钉扎，导致在微球周围形成纳米级迷宫图案。纳米级迷宫图案和微米级多圆形微球阵列，连同打印的宏观图像，构成了一个三级渐进防伪系统。此外，该系统与基于人工智能的识别策略兼容，能够快速识别和验证不可克隆的安全标签。
