Structural and Spectroscopic Analysis of Reddish-Orange Emitting (Y1−x)₂WO₆:xEu³⁺ (0 ≤ x ≤ 0.11) Nanophosphors for Anti-Counterfeiting Application

Exploring luminescent materials that meet the necessary specifications for anti-counterfeiting applications has been the focus of extensive research. In this study, we delve into a double perovskite-structured material, (Y 1−x ) 2 WO 6 :xEu 3+ (0 ≤ x ≤ 0.11), synthesized via a chemical combustion method. The crystallographic studies using the X-ray diffraction pattern confirm the crystallization of the nanophosphors into the monoclinic phase with a P2/c space group. The Raman and Fourier transform infrared spectroscopy studies provide insights into the nature of chemical bonding within the material. UV visible spectra are analysed to determine the optical energy gap. Notably, the photoluminescence emission spectra of the Eu 3+ incorporated phosphors exhibit a distinct emission peak at 609 nm, corresponding to the 5 D 0 → 7 F 2 electric dipole transition of the Eu 3+ ions. The optimal photoluminescence intensity is observed for the x = 0.07 nanophosphor, with estimated chroma coordinates of (0.500, 0.316), placing it in the reddish-orange region of the chromaticity diagram. The incorporation of Eu 3+ enhances magnetization, attributed to the presence of Eu 3+ ions in the 7F 2 state. The luminance stability is a critical factor for long-term performance, the x = 0.07 phosphor was analysed under rigorous physical and chemical testing and is found to be stable, making it a favourable candidate as a luminescence pigment for anti-counterfeiting applications.