Cui Hao, Li Junwei, Wei Kai, Zhang Guosheng, Zhou And Sheng
Opt Express. 2022 Apr 11;30(8):13106-13113. doi: 10.1364/OE.453521.
High security and convenient operation have been the aim of the anticounterfeiting field. An anticounterfeit system in which multiple information are written on an overlapping area with quantum dot (QD) inks of different fluorescence wavelengths that combines spectroscopy technology for information identification is proposed in this study. Because the emission spectra of QDs can be tuned by simply changing the size, ultraviolet (UV) glue mixed with different sizes of CdSe/ZnS QDs is used as the printing ink with different fluorescence wavelengths. Software-design labels with different information are printed on the overlapping area using inks with different luminescent QDs. The printed information can only be identified by the bandpass filter with the corresponding wavelength under UV light. Under natural light, the information cannot be identified by the naked eye. In the proposed anticounterfeiting system, the excitation light and filter are both indispensables. Our method makes the fabrication of anticounterfeit labels flexible in design, fast in production, and high in information concealment. Meanwhile, the proposed system is quick and convenient, which has huge application potential in the field of display and anticounterfeiting.
高安全性和便捷操作一直是防伪领域的目标。本研究提出了一种防伪系统，该系统将多种信息写在具有不同荧光波长的量子点（QD）墨水的重叠区域上，并结合光谱技术进行信息识别。由于量子点的发射光谱可以通过简单地改变尺寸来调节，因此将混合了不同尺寸CdSe/ZnS量子点的紫外（UV）胶水用作具有不同荧光波长的印刷油墨。使用具有不同发光量子点的油墨在重叠区域上打印带有不同信息的软件设计标签。打印的信息只能在紫外光下通过具有相应波长的带通滤波器进行识别。在自然光下，肉眼无法识别这些信息。在所提出的防伪系统中，激发光和滤波器都是必不可少的。我们的方法使防伪标签的制造在设计上灵活、生产快速且信息隐蔽性高。同时，所提出的系统快速便捷，在显示和防伪领域具有巨大的应用潜力。
