SYNTHESIS AND PROPERTY INVESTIGATION OF THE LUMINESCENT NANOMATERIAL GdVO₄:5%Eu³⁺ FOR SECURITY FLUORESCENT INK APPLICATIONS

Abstract

The luminescent nanomaterial GdVO₄ was synthesized via a combustion method. The structure and morphology of the synthesized material were studied using XRD, SEM, and EDX methods. The optical properties of the material were recorded by fluorescence spectroscopy and fluorescence lifetime measurement. Under excitation light with a wavelength of 254 nm, the fluorescence spectrum showed the characteristic transitions of Eu³⁺ ions ⁵D₀→⁷F_J (J = 1,2,3,4), in which the red emission corresponding to the transition ⁵D₀→⁷F₂ at 615 nm was dominant. The fluorescence lifetime of the material was determined to be 1.34 ms. There was an initial successful signal when testing security ink with a composition of GdVO₄:5%Eu, PVA, and ethanol. The security ink fluoresced red under excitation light with a wavelength of 254 nm.