Journal
MOLECULES
Volume 26, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/molecules26041041
Keywords
NaYF4:Er,Yb; upconversion emission; surface modification; hydrophilic; screen printing
Funding
- National Foundation for Science and Technology Development [103.03-2018.326.] Funding Source: Medline
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NaYF4:Er,Yb upconversion luminescent nanoparticles were prepared by hydrothermal methods with MA grafting for hydrophilic properties, showing high stability and emission intensity suitable for screen printing applications.
NaYF4:Er,Yb upconversion luminescent nanoparticles (UCNPs) were prepared by hydrothermal methods at 180 degrees C for 24 h. The X-ray diffraction (XRD) and TEM (transmission electron microscopy) images show that the resulting 60 nm UCNPs possess a hexagonal structure. In this work, maleic anhydride (MA) was grafted on the surface of UCNPs to induce hydrophilic properties. The photoluminescence spectra (PL) show upconversion emissions centered around 545 nm and 660 nm under excitation at 980 nm. The luminescent inks, including UCNPs@MA, polyvinyl alcohol (PVA), deionized water (DI), and ethylene glycol (EG), exhibit suitable properties for screen printing, such as high stability, emission intensity, and tunable dynamic viscosity. The printed patterns with a height of 5 mm and a width of 1.5 mm were clearly observed under the irradiation of a 980 nm laser. Our strategy provides a new route for the controlled synthesis of hydrophilic UCNPs, and shows that the UCNPs@MAs have great potential in applications of anti-counterfeiting packing.
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