近日，中山大学的杨柏儒及其研究团队取得一项新进展。经过不懈努力，他们基于TiO₂/CsPbBr₃复合颗粒研制出荧光多功能防伪快速响应电泳显示器。相关研究成果已于2024年8月20日在国际知名学术期刊《光：科学与应用》上发表。

在此，该研究团队基于荧光电泳显示器（EPD）制备了一种动态防伪（AC）装置，并在双模式驱动（电场和紫外线）下实现了黑色、白色和绿色荧光状态之间的图像切换。研究人员将钙钛矿量子点（CsPbBr₃）加载到TiO₂颗粒上，并通过接枝和聚合方法进一步制备了荧光电泳颗粒TiO₂/CsPbBr₃-3-PLMA（TiO/CPB-3）。

此外，研究人员基于荧光EPD制作了防伪装置，该装置具有多功能防伪特性，其中荧光EPD具有350毫秒的快速响应时间、17的高对比度以及明亮的绿色荧光。该原型为未来动态防伪和识别提供了一种新方法。

据悉，传统的光学防伪（AC）技术是通过静态印刷图像实现的，这使得它们的安全级别较低，更容易被复制。因此，开发具有动态调制功能的防伪装置以提高安全性至关重要。电泳显示器（EPD）具有低功耗、高环境对比度以及显示动态图像的能力，适用于动态防伪应用。

附：英文原文

Title: Fluorescent, multifunctional anti-counterfeiting, fast response electrophoretic display based on TiO₂/CsPbBr₃ composite particles

Author: Liu, Guangyou, Wu, Xinzao, Xiong, Feng, Yang, Jinglan, Liu, Yunhe, Liu, Jie, Li, Zhuohang, Qin, Zong, Deng, Shaozhi, Yang, Bo-Ru

Issue&Volume: 2024-08-20

Abstract: 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 (CsPbBr₃) onto the TiO₂ particles and further prepared fluorescent electrophoretic particles TiO₂/CsPbBr₃-3-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 350ms, a high contrast ratio of 17, and bright green fluorescence. This prototype demonstrates a new way for future dynamic AC and identification.

DOI: 10.1038/s41377-024-01526-x

Source: https://www.nature.com/articles/s41377-024-01526-x