Liu Yang, Zheng Yuanhui, Zhu Yangbin, Ma Fumin, Zheng Xiaojing, Yang Kaiyu, Zheng Xin, Xu Zhongwei, Ju Songman, Zheng Yueting, Guo Tailiang, Qian Lei, 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. 2020 Sep 2;12(35):39649-39656. doi: 10.1021/acsami.0c11103. Epub 2020 Aug 5.
Anticounterfeiting techniques based on physical unclonable functions exhibit great potential in security protection of extensive commodities from daily necessities to high-end products. Herein, we propose a facile strategy to fabricate an unclonable super micro fingerprint (SMFP) array by introducing in situ grown perovskite crystals for multilevel anticounterfeiting labels. The unclonable features are formed on the basis of the differential transportation of a microscale perovskite precursor droplet during the inkjet printing process, coupled with random crystallization and Ostwald ripening of perovskite crystals originating from their ion crystal property. Furthermore, the unclonable patterns can be readily tailored by tuning in situ crystallization conditions of the perovskite. Three-dimensional height information on the perovskite patterns are introduced into a security label and further transformed into structural color, significantly enhancing the capacity of anticounterfeiting labels. The SMFPs are characterized with tunable multilevel anticounterfeiting properties, including macroscale patterns, microscale unclonable pattern, fluorescent two-dimensional pattens, and colorful three-dimensional information.
基于物理不可克隆功能的防伪技术在从日用品到高端产品等广泛商品的安全保护方面展现出巨大潜力。在此，我们提出一种简便策略，通过引入原位生长的钙钛矿晶体来制造不可克隆的超微指纹（SMFP）阵列，用于多级防伪标签。不可克隆特征基于喷墨打印过程中微尺度钙钛矿前驱体液滴的差异传输而形成，同时伴随着源自其离子晶体特性的钙钛矿晶体的随机结晶和奥斯特瓦尔德熟化。此外，通过调整钙钛矿的原位结晶条件，可以轻松定制不可克隆图案。将钙钛矿图案的三维高度信息引入安全标签，并进一步转化为结构色，显著增强了防伪标签的能力。SMFP具有可调谐的多级防伪特性，包括宏观图案、微尺度不可克隆图案、荧光二维图案和彩色三维信息。
