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To the novel BaGd 2 < / sub > ( as MoO in 4 < / sub >) 4 < / sub > -based light-induced color rendering light-emitting materials for pigments , phenolic resin solution as link material , adding other additives prepared photoluminescence security offset ink color . Printing ink colorless in ordinary light , red 395 nm UV laser excitation , excited by the 980 nm infrared laser green light stopped becomes colorless , strong color security features . This study determined the the photoluminescence color fluorescent agent BaGd 2 ( MoO 4 < / sub> ) 4 : the of Eu 3 , Yb 3 , Er 3 synthesis process , characterize its crystal structure and luminescence properties . Experiment to determine the the photoluminescence color offset printing ink formulations , ink luminescence properties , rheological properties and offset suitability . The following conclusions : ( 1 ) doping the of Eu 3 , Er 3 the Yb 3 < / sup> BaGd 2 ( MoO 4 ) 4 photoluminescence color material ratio of BaGd 2 (MoO 4 ) 4 : 0.6Eu 3 , 0.06Er 3 , 0.2Yb 3 , the synthesis temperature of 850 ° C , a time of five hours ; synthetic BaGd 2 (MoO 4 ) 4 crystal intact . Under UV excitation at 395 nm , the sample may issue a peak wavelength at 613 nm orange-red shade upconversion emission spectra in the 980 nm infrared excitation at 523 nm and 545 nm at the green emission is strongest . (2) the optimized formulation of the anti-counterfeiting photoinduced color offset ink (wt%): light-induced color fluorescent agent content of 35% , less the YS agent content of 2% , 2% of the content of the dispersant , antioxidant content of 1% , the resin The link material content of 60 %. Click ratio formulated fluorescent ink viscosity the 190.7Pa · S, the relative luminescence intensity maximum 299a.u. . (3) using the security of the inorganic pigment photoluminescence similar to the rheological properties of the color offset inks and the use of organic pigments with three brands of commercial monochrome offset ink , indicating that the ink dispersion formed a dispersion - condensing the brand of the structure with the use of organic pigments ink similar, with a sufficiently large initial viscosity sufficiently low shear viscosity suitable thixotropic , viscoelastic and good offset adaptation .
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