Synthesis, Spectroscopy Property and Luminescence Study of the Chelate Complexes of Europium with β-diketone and its Derivatives

The disclosed red luminous invisible ink composition is comprised of europium complex which is represented by the formula (1). 1.cf3(cf2)c(o)ch2c(o)c(ch3) 2.ch3c(o)ch2c(o) ch3 3.(cf3)c(o)ch2c(o) ch3cf3c(o)nhp (o)r1r2(r1&r2=c6h5ch2nch3) in this work, we made invisible offset print inks based on europium (iii) β–diketonates complexes and their derivatives. moreover, we used a new formulation by oprating such as solvent, resins, semi dry oils, anti-adhesive material, wet silicate aluminums, powder magnesium silicate for the synthesis of these inks.