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Luminescent ink from europium-doped  Y2O3 ( Y2O3:Eu) has been synthesized by two steps method: first, synthesis of luminescent powder of  Y2O3:Eu by simple heating of metallic nitrates in a polymer solution and second, dispersing the powder in a polyvinyl alcohol (PVA) solution. The stability of the ink (luminescent colloid) was strongly affected by mixing process of the powder and the solution. Mixing process must be performed for a long time (about 8 hours) at above room temperature to product stable colloids. We observed that mixing at 30–40∘C resulted in a stable and highly dispersed colloid. The writing test was performed on a white paper to show the potential use of the colloid for making security codes

Synthesis of Luminescent Ink from Europium-Doped Y2O3 Dispersed in Polyvinyl Alcohol Solution

Synthesis of Luminescent Ink from Europium-Doped Y₂O₃ Dispersed in Polyvinyl Alcohol Solution