Abstract
We report a simple method for the synthesis of ultra-fineEu3+-dopedyttria (Y2O3) nanophosphors with an average diameter of∼5 nm for development of a transparent colloid that could be used as aluminescent security ink. This has been achieved by suitably substitutingEu3+ ions at thefavorable C2 symmetry sites of Y3+ ions and quantum mechanically confining the growth of the nanophosphorusing a novel acid-catalyzed sol–gel technique. This is one of the fewreports that depict the development of a transparent aqueous-stableY2O3:Eu3+ colloidal solution for strategic applications related to security codes. High resolutiontransmission electron microscopy images showed excellent lattice fringes that in turn supportthe presence of better crystal quality and enhanced photoluminescence (PL) emission from theY1.9O3Eu0.13+ nanophosphor system. Time resolved emission spectroscopy measurement indicated a PLdecay time in the range of a few milliseconds, suitable for making luminescent securityink and other advanced applications in optoelectronic devices and bio-labeling.
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