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    Synthesis and Research of Rare Earth Nanocrystal Luminescent Properties for Security Labels Using the Electrohydrodynamic Printing Technique

    Year: 2020

    Journal: Processes, Volume 8, FEB

    Authors: Trinh Chinh Dung; Doan Thuan Van; Pham Phuong Hau Thi; Dang Dung My Thi; Quan Pham Van; Dang Chien Mau

    Organizations: Ministry of Science and Technology of Vietnam [03/2019/HD-SPDP]

    Keywords: luminescent material; nanoparticles; YVO4; Eu3+

    YVO4:Eu3+ nanoparticles were successfully synthesized by two methods, namely the sonochemical method and hydrothermal method. The X-ray diffraction (XRD) patterns showed the tetragonal phase of YVO4 (JCPDS 17-0341) was indexed in the diffraction peaks of all samples. The samples synthesized by the sonochemical method had a highly crystalline structure (X-ray diffraction results) and luminescence intensity (photoluminescence results) than those synthesized by the hydrothermal method. According to the results of field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), the average size of YVO4:Eu3+ nanoparticles was around 25-30 nm for the sonochemical method and 15-20 nm for the hydrothermal method. YVO4:Eu3+ nanoparticles in the case of the sonochemical method had a better crystalline structure and stronger emissivity at 618 nm. The Eu3+ ions' average lifetime in YVO4:Eu3+ at 618 nm emission under 275 nm excitation were at 0.955 ms for the sonochemical method and 0.723 ms for the hydrothermal method. The security ink for inkjet devices contained YVO4:Eu3+ nanoparticles, the binding agent as polyethylene oxide or ethyl cellulose and other necessary solvents. The device used for security label printing was an inkjet printer with an electrohydrodynamic printing technique (EHD). In the 3D optical profilometer results, the width of the printed line was similar to 97-167 mu m and the thickness at similar to 9.1-9.6 mu m. The printed security label obtained a well-marked shape, with a size at 1.98 x 1.98 mm.
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