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Advances in OptoElectronics
Volume 2009 (2009), Article ID 918351, 8 pages
http://dx.doi.org/10.1155/2009/918351
Research Article

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

Department of Physics, Bandung Institute of Technology, Jl. Ganeca 10, Bandung 40132, Indonesia

Received 1 January 2009; Revised 16 February 2009; Accepted 17 March 2009

Academic Editor: W.-C. Chen

Copyright © 2009 et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Luminescent ink from europium-doped ( :Eu) has been synthesized by two steps method: first, synthesis of luminescent powder of :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– 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.