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

Abstract

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

Development of photoluminescent, superhydrophobic, and electrically conductive cotton fibres

“…[22] Figure 6 shows the UV-vis absorption spectrum of the spray- spectra of SAO arose from the 4f 6 5D 1 $4f 7 transition of Eu(II). [20,57] No…”

“…When the external light source is turned off, the stored light energy is released slowly from the traps over minutes or even hours. [17][18][19][20] Photoluminescent pigments such as lanthanide-doped strontium aluminium oxide have been used in various applications such as emergency marks and safety clothing. Some long-persistent photoluminescent pigments have been developed to provide different materials of different colours such as Y 2 O 2 S:Mg 2+ ,Ti 4+[ , [21] for red emission, SrAl 2 O 4 :Eu 2+ ,Dy 3+ , [22] for green emission, and CaAl 2 O 4 :Eu 2+ ,Nd 3+ , [23] for blue emission.…”

Immobilization of silver and strontium oxide aluminate nanoparticles integrated into plasma‐activated cotton fabric: luminescence, superhydrophobicity, and antimicrobial activity

“…Lanthanide-doped strontium oxide aluminate (SOA) (SrAl 2 O 4 :Eu 2+ ,Dy 3+ ) is a well known long-persisting phosphorescent pigment that showed chemical and thermal stability, high ability for recycling, a nonradioactive nature, high quantum efficiency, and a lack of toxicity. [1][2][3][4][5][6] The industry making technical textiles holds great potential significance in the marketing of nano-based merchandise, particularly antimicrobial as well as other promising medical and protective technical textiles. [7][8][9][10][11] These nano-based smart textile materials can be promptly initiated with the implementation of metal-based nanoparticles (NPs) during the finishing processing of different fibrous materials.…”

Simple production of photoluminescent polyester coating using lanthanide‐doped pigment

“…After excitation, the treated coatings showed a shift in a* from Therefore, the crystals continue to emit bright white light as time proceeds by extending the time period for light emission after turning off the light source. [32][33][34] Phosphorescent green was monitored under the UV lamp, while a bright white followed by a phosphorescent light green colour were detected in the dark after UV excitation, as displayed in Figure 5.…”

“…This strong reversibility could be attributed to the luminescent pigment, which consist of strontium aluminate oxide crystals with the ability to store light energy upon excitation by an external UV source, as well as the lanthanide traps with the ability to slowly release the already stored light energy. Crystals are the luminescent component that can be charged under the light source, while the lanthanide trap exhibited a high ability to hold the light for a longer time interval [32][33][34].…”