Yang Jyun-Chi, Ho Yu-Chieh, Chan Yang-Hsiang
Department of Medicinal and Applied Chemistry , Kaohsiung Medical University , Kaohsiung 80708 , Taiwan.
ACS Appl Mater Interfaces. 2019 Aug 14;11(32):29341-29349. doi: 10.1021/acsami.9b10393. Epub 2019 Aug 5.
Innovative and scalable security technologies are in high demand to deter increasing counterfeiting in modern society. Here, we report the first example of thermochromic-fluorescent ink based on semiconducting polymer dots (Pdots) by taking advantage of the unique optical properties of Pdots. We designed and synthesized two types of thermochromic molecules and then incorporated them with multicolor fluorescent Pdots. The resulting Pdots exhibited colorimetric and fluorescent dual-readout abilities in response to different temperatures which greatly increase the security level for anticounterfeiting applications. These multifunctional Pdots can be easily doped into flexible substrates or prepared as inks. These full-color inks can be further loaded into marker pens for handwriting or cartridges for inkjet printing with excellent signal-to-background contrast. Moreover, complex and delicate full-color images can be printed on security documents or currency for practical use. We anticipate that this first example of thermoresponsive dual-readout methodology based on Pdots will have broad use in advanced security marking technologies.
在现代社会中，为了遏制日益猖獗的假冒行为，对创新且可扩展的安全技术需求高涨。在此，我们利用半导体聚合物点（Pdots）独特的光学特性，报道了首例基于热致变色荧光墨水的研究。我们设计并合成了两种热致变色分子，然后将它们与多色荧光Pdots相结合。所得的Pdots在不同温度下展现出比色和荧光双读出能力，极大地提高了防伪应用的安全级别。这些多功能Pdots可以轻松地掺杂到柔性基材中或制备成墨水。这些全色墨水可以进一步装入标记笔用于手写，或装入墨盒用于喷墨打印，具有出色的信号与背景对比度。此外，复杂而精致的全色图像可以打印在安全文件或货币上以供实际使用。我们预计，这个基于Pdots的热响应双读出方法的首例研究将在先进的安全标记技术中得到广泛应用。
