Eu3+ doped SrMoO4: A promising nanophosphor for enhanced fingerprint detection and cheiloscopy

Abstract

Developing a single material with diverse applications like fingerprint detection, cheiloscopy, and anti-counterfeiting is truly innovative and has the potential to revolutionize various fields. Here, we synthesized nano phosphors powders of SrMoO4 nanoparticles, doped with spherical-shaped Eu3+ ions via co-precipitation method. X-ray diffraction (XRD) analysis confirmed the formation of the SrMoO4 phase with Eu3+ successfully incorporated into the lattice. Field emission scanning electron microscopy (FESEM) images revealed the nanoparticles to be spherical and monodispersed with a narrow size distribution. Energy dispersive X-ray spectroscopy (EDS) confirmed the presence of Sr, Mo, Eu3+, and O elements, indicating a homogeneous elemental composition. Fourier transform infrared (FTIR) spectroscopy showed characteristic bands for MoO bonds and hydroxyl groups. Diffuse reflectance spectroscopy (DRS) analysis revealed a decrease in band gap with increasing Eu3+ concentration, suggesting that Eu3+ doping potentially modifying the optical properties of SrMoO4, and introducing new functionalities. Their red photoluminescence property, making them suitable for various optical applications. The nanoparticles showed potential applications in fingerprint detection, cheiloscopy (lip print analysis), and anti-counterfeiting due to their red luminescence, small size, and biocompatibility. The developed fingerprints showed excellent contrast, high sensitivity and selectivity on various substrates. In vitro cytotoxicity studies indicated that the nanoparticles were non-toxic to normal kidney epithelial cells at the tested concentrations. Thess versatilities demonstrate the potential of engineered materials for criminal identification in forensic applications. Therefore, they play a crucial role in solving crimes and bringing justice to victims.