Abstract
Red-emitted Y2O3:Eu3+ nanophosphor coated on a mica flake (Y2O3:Eu@MF) or on TiO2 having a rutile crystalline mica flake (Y2O3:Eu@TMF) has been prepared by an electrostatic interaction with the wet-coating method for the purpose of a pigment with luminescent and gloss properties. Aggregated Y2O3:Eu3+, prepared by the template method, was dispersed into nanosol by a controlled bead-mill wet process. The (+) charged Y2O3:Eu3+ nanosol was effectively coated on the (-) charged mica flake (MF) or the TiO2/mica flake (TMF) by an electrostatic interaction between the Y2O3:Eu3+ nanoparticles and MF or TMF at pH 6–8. The coating factors of Y2O3:Eu@MF were also studied and optimized by controlling the pH, stirring temperature, calcination temperature, and coating amount of Y2O3:Eu3+. The Y2O3:Eu3+ was partially coated and optimized on the MF or TMF surface with a coating coverage of about 40–50% or 60–70%, respectively. Y2O3:Eu@MF and Y2O3:Eu@TMF were exhibiting the luminescent property of a red color under a 254 nm wavelength, and had a color purity of over 95% according to CIE chromaticity coordinates. These materials were characterized by X-ray diffraction, FE-SEM, zeta potential, and a fluorescence spectrometer. These materials with luminescent and gloss properties prepared in this work potentially meet their applications for security purposes.
Highlights
Europium-doped Y2 O3 (Y2 O3 :Eu3+ ) is an important red phosphor, which is known for various applications due to its excellent optical properties
We have recently reported that lanthanide-based nanophosphor and its dispersed nanosol with good luminescent property have the potential to be applied for security purposes [16]
This study confirmed that Y2 O3 :Eu3+ coated on mica flake (MF) or TiO2/mica flake (TMF) can be applied for the preparation of a photo-functional security pigment with anti-counterfeiting properties
Summary
Europium-doped Y2 O3 (Y2 O3 :Eu3+ ) is an important red phosphor, which is known for various applications due to its excellent optical properties. The products obtained by the SSR method have some disadvantages, such as non-homogeneous phase distribution, a bulky and non-uniform particle shape, which may degrade the luminescence properties of the phosphors. Such problems have been overcome by using a novel liquid-phase precursor approach or the confined space method using a template source, which may be a good way to prepare these materials with excellent luminescence properties [12,13]. This study confirmed that Y2 O3 :Eu3+ coated on MF or TMF can be applied for the preparation of a photo-functional security pigment with anti-counterfeiting properties
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