Yao Wenhuan, Lan Ruochen, Li Kexuan, Zhang Lanying
Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-Environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
ACS Appl Mater Interfaces. 2021 Jan 13;13(1):1424-1430. doi: 10.1021/acsami.0c18132. Epub 2021 Jan 5.
A composite film with multiple anti-counterfeiting features was demonstrated by superposing quantum dots (QDs) polymer matrix (film A) and cholesteric liquid crystal film (film B) together. The first-line and second-line anti-counterfeiting characteristics were successfully implemented by employing thermochromic, angular photochromic, and circularly polarized discoloration of film B, respectively. By initiatively utilizing the different relative positions between the fluorescence emission peak (λ) of film A and the central selective reflection wavelength (λ) of film B at different temperatures, which resulted in changes in the fluorescence spectra or the different presence of latent patterns, the most important third-line anti-counterfeiting feature was successfully achieved.
通过将量子点（QD）聚合物基质（膜A）和胆甾相液晶膜（膜B）叠加在一起，展示了一种具有多种防伪特征的复合膜。分别利用膜B的热致变色、角光致变色和圆偏振变色成功实现了一线和二线防伪特性。通过主动利用膜A的荧光发射峰（λ）与膜B在不同温度下的中心选择性反射波长（λ）之间的不同相对位置，这导致荧光光谱的变化或潜图案的不同呈现，成功实现了最重要的三线防伪特征。
