Counterfeiting of confidential documents has been a costly challenge for banks, companies, and customers. Encryption of invisible security marks, such as barcodes, quick response codes, and logos, in national or international confidential documents by high-security anticounterfeiting inks is the most significant solution for counterfeiting problems. Ecofriendly multi-color photoluminescent anticounterfeiting inks based on highly-fluorescent polymer nanoparticles functionalized with new oxazolidine derivatives were developed for the fast and facile encryption of security labels on cellulosic documents, such as paper currency, passport, and certificate. Depending on the polarity of functionalized polymer nanoparticles, a wide range of colors and fluorescence emissions were observed as a result of polar-polar interactions between the oxazolidine molecules and surface functional groups of the nanoparticles. The fluorescent polymer nanoparticles showed spherical, vesicular, and cauliflower-like morphologies resulted from different surface functional groups. Functional polymer nanoparticles displayed high stability and printability on cellulosic substrates due to hydrogen bonding interactions. The highly-fluorescent polymer nanoparticles were also used to prepare anticounterfeiting inks with different colors and fluorescence emissions. All the ecofriendly polymeric anticounterfeiting inks were loaded to stamps with specific marks, and then applied to different confidential documents. Printed labels displayed highly intense fluorescence emission in different colors (green, orange, pink, and purple depending on the matrix polarity) under UV irradiation (365 nm). These water-based multi-color fluorescent anticounterfeiting inks with highly intense, bright, and sensitive fluorescence emission have potential applications in encryption and authentication of security patterns.

对于银行，公司和客户而言，伪造机密文件一直是一项昂贵的挑战。解决伪造问题的最重要方法是使用高安全性的防伪油墨对国家或国际机密文档中的条形码，快速响应代码和徽标等隐形安全标记进行加密。开发了一种基于高荧光聚合物纳米颗粒的环保多色光致发光防伪油墨，该纳米颗粒用新的恶唑烷衍生物进行了功能化，可快速，轻松地加密纤维素证件（例如纸币，护照和证书）上的安全标签。根据官能化聚合物纳米粒子的极性，由于恶唑烷分子与纳米颗粒的表面官能团之间存在极性相互作用，因此观察到了多种颜色和荧光发射。荧光聚合物纳米颗粒表现出由不同的表面官能团导致的球形，水泡状和花椰菜状的形态。由于氢键相互作用，功能聚合物纳米颗粒在纤维素基材上显示出高稳定性和可印刷性。高荧光聚合物纳米颗粒还用于制备具有不同颜色和荧光发射的防伪油墨。所有环保聚合物防伪油墨都被装载到带有特定标记的邮票上，然后应用于不同的机密文件。打印的标签在紫外线（365 nm）下显示不同颜色（取决于基质极性的绿色，橙色，粉红色和紫色）​​的强烈荧光发射。这些具有高强度，明亮和敏感荧光发射的水性多色荧光防伪油墨在安全图案的加密和认证中具有潜在的应用。