Abstract
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.
Highlights
Rare earth ions have long been used for producing phosphor materials
In this study, red phosphor of Y2O3:Eu was prepared by using a simple heating of the corresponding nitrous metals in a polymer liquid
We identified an increase of colloid stability when using higher polyvinyl alcohol (PVA) molarity
Summary
Rare earth ions have long been used for producing phosphor materials. Doping appropriate host matrix (usually oxide) with these ions products sharp and intense emission under UV excitation [1]. Researchers have succeeded to produce many kinds of rare earth-doped oxide phosphors emitting various colors. To date, they succeeded to produce blue phosphor of (Zn,Mg)O:Zn, green phosphor of ZnGa2O4:Mn, red phosphor of Y2O3:Eu and CrTiO3:Pr [2, 3], red phosphor of SrTiO3:Pr,M(M = Al or Ga) [4], and yellow-green phosphor of (Y,Gd)Al5O12:Ce [5, 6]. Red phosphor of Y2O3 doped with trivalent ions such as Eu has attracted considerable interest in terms of high chemical durability and thermal stability [7]. This phosphor has been widely used in CRT displays. Many kinds of methods have been proposed to synthesize Y2O3-based phosphors such as solgel method [8], chemical vapor deposition [9], combustion synthesis [10] coprecipitation [11], spray pyrolysis [12], simple heating of precursors in a polymer solution [13], hydrothermal [14,15,16], and bicontinuous cubic phase [17, 18]
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