| Autor: |
Naveen Kumar, K., Vijayalakshmi, L., Lee, Gayeon, Kang, Gumin, Lim, Jiseok, Choi, Jungwook |
| Zdroj: |
Journal of Rare Earths; December 2023, Vol. 41 Issue: 12 p1850-1859, 10p |
| Abstrakt: |
We synthesized reddish-orange luminescent La10W22O81(LWO):Sm3+microphosphors by hydrothermal-assisted solid-state reaction. X-ray diffraction analysis reveals that all the studied phosphors crystallize in an orthorhombic structure in the Pbcnspace group (60). Field emission scanning electron microscopy indicates that the LWO:1.5 mol% Sm3+phosphor displays a smooth-surfaced hexagonal rod-like shape, with a closed shape at both ends, and high-resolution transmission electron microscopy demonstrates a robust crystalline structure. The chemical composition and valence states of the phosphor were investigated using X-ray photoelectron spectroscopy. At 403 nm excitation, LWO:1.5 mol% Sm3+exhibits maximum intensity with the strongest band at 596 nm (4G5/2 → 6H7/2) in the reddish-orange region. The intensity of Sm3+emission decreases beyond 1.5 mol% owing to concentration quenching regulated by dipole–quadrupole interaction between Sm3+ions. The optimized microphosphor LWO:1.5 mol% Sm3+exhibits color coordinates (0.5760, 0.4207), which is close to that of the Amber LED-NSPAR 70 BS (0.570, 0.420), displaying the highest color purity of 99.2% and correlated color temperature of 1694 K. In addition, both breast cancer cells MCF-7 and normal lung fibroblasts WI-38 were tested for toxicity with the optimized microphosphor. It is found that the LWO:1.5 Sm3+microphosphor is extremely toxic to cancer cells, but not to normal cells. Based on these results, LWO:Sm3+microphosphor can serve as a biomedical candidate for the treatment of cancer, as well as a potential multicolor emitting material for w-LEDs. |
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