Excitation-Wavelength- and Time-Dependent Fluorescent Ink Based on RGB Building Blocks for Advanced Anti-Counterfeiting

荧光 墨水池 激发波长 激发 RGB颜色模型 波长 光电子学 材料科学 光学 计算机科学 物理 工程类 人工智能 电气工程 复合材料
作者
Chengxin Lin,Chenxi Kang,Xinxin He,Jiaci Yi,Qi Zhu
出处
期刊:Coatings [MDPI AG]
卷期号:14 (4): 506-506 被引量:1
标识
DOI:10.3390/coatings14040506
摘要

What is reported here is an advanced anti-counterfeiting ink whose luminous effect changes over time and at different excitation wavelengths. Unlike traditional anti-counterfeit fluorescent materials, the phosphors used here exhibit multicolor emissions under multiple excitation modes. In this work, the most important building blocks are three classic phosphors with primary colors, red (Ca2YNbO6:0.4Eu3+), green (SrAl2O4:0.01Eu2+, 0.02Dy3+) and blue (CaAl2O4:0.012Eu2+, 0.06Nd3+, 0.036Gd3+), which were synthesized using the high-temperature solid-state method. The phosphors formed homogeneous solid solutions and were uniformly distributed throughout the mixture. A homogeneous transparent luminescent ink was obtained by blending the multi-mode phosphors with transparent screen-printing ink, resulting in multi-mode luminescence by simply varying the proportions of the red (R), green (G) and blue (B) phosphors. Thanks to this simple process, an advanced anti-counterfeiting ink with low production costs was achieved. Anti-counterfeiting logos of a “Giraffe” and “Steam Train” were printed using the transparent fluorescent ink onto black cardstock, exhibiting the characteristic of dynamic luminescence dependent on the duration and excitation wavelength. The anti-counterfeiting effect of the patterns suggests that the fluorescent ink is worth developing and is reliable in its application.
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