Liu Guangyou, Wu Xinzao, Xiong Feng, Yang Jinglan, Liu Yunhe, Liu Jie, Li Zhuohang, Qin Zong, Deng Shaozhi, Yang Bo-Ru
State Key Laboratory of Opto-electronic Materials and Technology, Guangdong Province Key Laboratory of Display Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China.
Light Sci Appl. 2024 Aug 20;13(1):198. doi: 10.1038/s41377-024-01526-x.
Traditional optical anti-counterfeiting (AC) is achieved by static printed images, which makes them susceptible to lower levels of security and easier replication. Therefore, it is essential to develop AC device with dynamic modulation for higher security. Electrophoretic display (EPD) has the advantages of low power consumption, high ambient contrast ratio, and capability of showing dynamic images which is suitable for dynamic AC applications. Herein, we prepared a dynamical AC device based on a fluorescent EPD, and achieving the image switch between black, white, and green fluorescence states under the dual-mode driving (electronic field and UV light). We loaded perovskite quantum dots (CsPbBr) onto the TiO particles and further prepared fluorescent electrophoretic particles TiO/CsPbBr-3-PLMA (TiO/CPB-3) by grafting and polymerizing method. In addition, we fabricated the AC devices based on the fluorescent EPD, which exhibits the multifunctional AC, where the fluorescent EPD has a fast response time of 350 ms, a high contrast ratio of 17, and bright green fluorescence. This prototype demonstrates a new way for future dynamic AC and identification.
传统的光学防伪技术是通过静态印刷图像实现的，这使得它们在安全性方面较低且更容易被复制。因此，开发具有动态调制功能的防伪设备以提高安全性至关重要。电泳显示（EPD）具有低功耗、高环境对比度以及能够显示动态图像的优点，适用于动态防伪应用。在此，我们制备了一种基于荧光EPD的动态防伪设备，并在双模驱动（电场和紫外光）下实现了黑色、白色和绿色荧光状态之间的图像切换。我们将钙钛矿量子点（CsPbBr）负载到TiO颗粒上，并通过接枝聚合方法进一步制备了荧光电泳颗粒TiO/CsPbBr-3-PLMA（TiO/CPB-3）。此外，我们基于荧光EPD制造了防伪设备，该设备具有多功能防伪功能，其中荧光EPD具有350毫秒的快速响应时间、17的高对比度和明亮的绿色荧光。该原型为未来的动态防伪和识别展示了一种新方法。
