A novel photoluminescent ink has been formulated by synthesizing Eu(FAC)3Phen as a red luminescent down-shifting emitter and employing SrAl2O4:Eu, Dy as a long persistent green phosphor. Both emitters are incorporated to design a photoluminescent ink with binary emission under a single UV excitation wavelength, where a red light is emitted when exposed under 325 nm, subsequently becoming green upon the UV light being switched off. The concept presented here is unequivocally distinct from the classical dual-mode emission, which requires a second extra near-infrared excitation around 980 nm to produce a binary luminescence.
The technology concerns a new luminescent ink composed of LDS and afterglow complexes, which release separate emissions under one excitation wavelength and, consequently, simplify the use of the more complex concept of up-converted near-infrared luminescent materials. In contrast to traditional europium(III)β-diketonate complexes as luminescent down-shifting agents,12-15the complex used is Eu(FAC)3Phen that it exhibits a very strong red emission at 612 nm under UV light at 325 nm. Under the same excitation wavelength, the SrAl2O4:Eu, Dy releases a very strong green emission several minutes after
removal of the UV excitation.
There are currently several high-security techniques proposed for the prevention of document and identity fraud, namely,
invisible personal information (IPI) technology containing a specialfilter integrated within the polycarbonate data page, rendering concealed personalized data visible. More recent dual-fluorescence mode techniques have been implemented as alternatives in anti-counterfeiting applications using a lanthanide-doped NaLuF4/Y2O3composite,which, upon exposure to excitation with a laser at 980 nm and with UV light at 254 nm, results in a multicolor dual emission.This trend to provide diverse security printing methods comes with its own set of challenges, especially regarding the use of expensive materials. Moreover, while single-fluorescence luminescent materials may be widely integrated as part of the forensic features, they are nonetheless susceptible to potential counterfeiting.
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Mohammed VI Polytechnic University is an institution oriented towards applied research and innovation with a focus on Africa. The University is engaged in economic and human development and puts research and innovation at the forefront of African development. A mechanism that enables it to consolidate Morocco’s frontline position in these fields, in a unique partnership-based approach and boosting skills training relevant for the future of Africa.
Located in Benguerir, near Marrakech, in the heart of the Mohammed VI Green City, Mohammed VI Polytechnic University intends to shine on a national, continental and international scale.
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