%0 Journal Article
%T Synthesis of Luminescent Ink from Europium-Doped Y2O3 Dispersed in Polyvinyl Alcohol Solution
%A Astuti
%A Mikrajuddin Abdullah
%A Khairurrijal
%J Advances in OptoElectronics
%D 2009
%I Hindawi Publishing Corporation
%R 10.1155/2009/918351
%X 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 30–40ˇăC 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.
%U http://www.hindawi.com/journals/aoe/2009/918351/