Photochromic and fluorescent ink using photoluminescent strontium aluminate pigment and screen printing towards anticounterfeiting documents,Luminescence

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Photochromic and fluorescent ink using photoluminescent strontium aluminate pigment and screen printing towards anticounterfeiting documents
Luminescence ( IF 3.2 ) Pub Date : 2020-11-20 , DOI: 10.1002/bio.3987
Marwa M Abdelhameed ₁ , Yasser A Attia ₁ , Meram S Abdelrahman ₂ , Tawfik A Khattab ₂

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Novel inorganic–organic hybrid photochromic and fluorescent ink for anticounterfeiting documents was developed using a pigment/resin ink formula enclosing a long‐lived luminescent inorganic pigment with good thermal photostability. The produced ink exhibited an optimal excitation wavelength at 360 nm with an absorption colour and fluorescence changes in the printed document. To develop a transparent printed film from pigment/resin ink, the phosphorescent pigment has to be well dispersed physically without agglomeration. The pigment/resin hybrid was applied effectively onto commercial cellulose paper sheets using screen‐printing technology. An homogeneous photochromic layer was deposited on cellulose paper document surface to afford a considerable greenish‐yellow colour as demonstrated by CIE coloration measurements under a UV lamp, even at a pigment concentration as low as 0.1 wt% of the ink formulation. The printed paper sheets exhibited three excitation bands at 235, 274 and 378 nm and three emission bands at 416, 418 and 436 nm. Fluorescence optical microscopy, Fourier‐transform infrared spectroscopy, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and wavelength‐dispersive X‐ray fluorescence spectrometry of the printed paper sheet were explored. The screen‐printed paper sheets displayed a reversible and fast photochromism during ultraviolet irradiation without fatigue. The rheological properties, stability, and printability of the ink were studied.

中文翻译：

使用光致发光铝酸锶颜料的光致变色和荧光墨水，并丝网印刷成防伪文件

使用颜料/树脂油墨配方开发了一种新型的无机-有机混合光致变色和荧光油墨，该油墨/树脂油墨配方封装了具有良好热光稳定性的长寿命发光无机颜料。所产生的油墨在360nm处表现出最佳的激发波长，并且在印刷文件中具有吸收颜色和荧光变化。为了用颜料/树脂油墨显影透明的印刷膜，磷光颜料必须在物理上良好地分散而不结块。使用丝网印刷技术将颜料/树脂杂化材料有效地应用于商业纤维素纸上。均匀的光致变色层沉积在纤维素纸质文档的表面上，提供了相当的黄绿色，这在紫外灯下通过CIE着色测量得到了证明，即使在颜料浓度低至油墨配方的0.1 wt％的情况下也是如此。印刷的纸张在235、274和378 nm处显示三个激发带，在416、418和436 nm处显示三个发射带。探索了印刷纸张的荧光光学显微镜，傅里叶变换红外光谱，扫描电子显微镜，能量色散X射线光谱和波长色散X射线荧光光谱。在紫外线照射下，丝网印刷的纸张显示出可逆且快速的光致变色现象，且无疲劳感。研究了油墨的流变性，稳定性和可印刷性。探索了印刷纸张的荧光光学显微镜，傅里叶变换红外光谱，扫描电子显微镜，能量色散X射线光谱和波长色散X射线荧光光谱。在紫外线照射下，丝网印刷的纸张显示出可逆且快速的光致变色现象，且无疲劳感。研究了油墨的流变性，稳定性和可印刷性。探索了印刷纸张的荧光光学显微镜，傅里叶变换红外光谱，扫描电子显微镜，能量色散X射线光谱和波长色散X射线荧光光谱。在紫外线照射下，丝网印刷的纸张显示出可逆且快速的光致变色现象，且无疲劳感。研究了油墨的流变性，稳定性和可印刷性。

更新日期：2020-11-20

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