Document Type : Review Articles
Authors
1
Department of Laser in Meteorology, Photochemistry & Agriculture, National Institute of Laser Enhanced Sciences, Cairo University, Giza 12613, Egypt
2
Department of Laser in Meteorology, Photochemistry & Agriculture (LAMPA), National Institute of Laser Enhanced Sciences, Cairo University, Giza, 12613, Egypt, Department of Laser in Meteorology, Photochemistry & Agriculture (LAMPA),
3
Textile Industries Research Division, National Research Centre, 33 El-Buhouth Street, Dokki, Cairo 12622, Egypt
4
Dyeing, Printing and Auxiliaries Department, Textile Research Division, National Research Centre, Cairo 12622, Egypt
Abstract
Luminescent security inks have great commercial importance in anti-counterfeiting applications. There are many methods and strategies for making luminescent ink and the improvement for these methods and designing strategies is the major challenge. Luminescent inks are usually characterized with high stability, low cost of ink medium, availability of ink medium, high-quality distribution of luminescent nanomaterials, strong luminescence intensity, the suitability of the print on different surfaces, high surface tension, and viscous nature of ink medium. Luminescent security inks may be hydrophilic or hydrophobic in nature so studying chemistry for this kind of ink is very important before using it to print security encodings and patterns on various kinds of surfaces. There are principles to synthesize luminescence-based security inks with desired characteristics, such as the selection of photoluminescent ink medium. Thus, we must take into consideration some conditions for the ink medium, including homogeneous dispersion of the luminescent nanomaterials, viscous medium appropriate to print onto various types of printable surfaces, and appropriate boiling point of the ink medium. In this review, we discuss the recent developments on hybrid photochromic inks for anticounterfeiting applications.
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