NaGd(WO4)2:Eu3+荧光材料的合成、表征及手印显现应用研究OA

The application of rare-earth ion-activated bimetallic tungstates fluorescent materials in the field of latent fingerprint visualization was investiged in this work.A red-emitting NaGd(WO4)2:Eu3+phosphor was synthesized via a high-temperature solid-state reaction,employing NaGd(WO4)2 as host matrix and Eu3+as activator.The phase structure and optical properties of the synthesized material were systematically characterized.X-ray diffraction(XRD)analysis confirmed the successful incorporation of Eu3+ions into the crystal lattice of the NaGd(WO4)2 host without inducing significant structural distortion.Under ultraviolet light excitation,the material exhibited strong photoluminescence originating from the characteristic F-F transitions of the Eu3+ions.The optimal photoluminescence intensity was achieved at a Eu3+doping concentration of 35%(Molar ratio).Further increase in concentration resulted in a quenching effect,which was primarily attributed to electric multipole interactions among the activator ions.The fingerprint development capability of the material was subsequently evaluated.On non-porous surfaces,the NaGd(WO4)2:Eu3+powder provided high contrast between the latent fingerprint ridges and the background substrate,effectively suppressing background interference.The developed fingerprints revealed level 1-3 ridge features in detail,demonstrating the material's high contrast,sensitivity,and selectivity.This work provided a promising new approach for applying rare-earth activated bimetallic tungstates in forensic technology.