Tb3+ doped CaWO4 nanomaterials for double level multicolor mode anticounterfeiting

Abstract

Numerous new demands and obstacles have been posed to contemporary luminescent materials and anti-counterfeiting systems by the ever-increasing importance of data security and identification. The legibility, repeatability, multicolorism, and stimuli-responsiveness of luminescent materials have recently garnered a lot of interest in this area. A multicolor luminescent material, CaWO4:Tb3+, was effectively synthesized using an ethylene glycol-aided solvothermal technique in our present study. Under the 254 nm UV light, the sample may change its emission color from blue to green by increasing the concentration of Tb3+ dopant from 0 to 5 at%. However, its color changes from bluish-white to greenish-white when excited at 365 nm UV light. Energy transfer from host to Tb3+ ions increases with increasing the terbium concentration with an efficiency of 62 % for 5 at% doped samples. Anti-counterfeiting ink for screen-printed alphabets is made from samples with adjustable luminescence. Luminescent security goods can benefit from the material's outstanding multicolor anti-counterfeiting qualities, as demonstrated by the results under diverse light sources.