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Robust color purity of reddish-orange emission from Sm^(3+)-activated La10W22O81 biocompatible microphosphors for solid state lighting and anticancer applications

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Journal of Rare Earths 2023年第12期41卷 1850-1859,I0001页

作者： K.Naveen Kumar L.Vijayalakshmi Gayeon Lee gumin kang Jiseok Lim Jungwook Choi School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeongbuk38541Republic of Korea Department of Automotive Engineering Yeungnam UniversityGyeongsanGyeongbuk38541Republic of Korea School of Mechanical Engineering Chung-Ang UniversitySeoul06974Republic of Korea Nanophotonics Research Center Korea Institute of Science and TechnologySeoul2792Republic of Kora

We synthesized reddish-orange luminescent La_(10)W_(22)O_(81)(LWO):Sm^(3+)microphosphors by hydrothermalassisted solid-state reaction.X-ray diffraction analysis reveals that all the studied phosphors crystallize in an orthorhombic structure in the Pbcn space group(60),Field emission scanning electron microscopy indicates that the LWO:1.5 mol% Sm^(3+)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 *** chemical composition and valence states of the phosphor were investigated using X-ray photoelectron *** 403 nm excitation,LWO:1.5 mol% Sm3+exhibits maximum intensity with the strongest band at 596 nm(^(4)G_(5/2)→^(6)H_(7/2)) in the reddish-orange *** intensity of Sm^(3+) emission decreases beyond 1.5 mol% owing to concentration quenching regulated by dipole-quadrupole interaction between Sm^(3+)*** optimized microphosphor LWO:1.5 mol% Sm^(3+)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 *** addition,both breast cancer cells MCF-7 and normal lung fibroblasts WI-38 were tested for toxicity with the optimized *** is found that the LWO:1.5 Sm^(3+)microphosphor is extremely toxic to cancer cells,but not to normal *** on these results,LWO:Sm^(3+)microphosphor can serve as a biomedical candidate for the treatment of cancer,as well as a potential multicolor emitting material for w-LEDs.

关键词： Sm^(3+):La_(10)W_(22)O_(81) Reddish-orangeemission Color purity Photonic applications Anticancer Rareearths

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