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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Preparation of spherical core-shell structured SiO_2@CaMoO_4:Eu~(3+),Li~+ red phosphors N^Gui-hua Peng D Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Chemical Engineering Guangxi Normal University, Cuilin 541001, China
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Preparation of spherical core-shell structured SiO_2@CaMoO_4:Eu~(3+),Li~+ red phosphors N^Gui-hua Peng D Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Chemical Engineering Guangxi Normal University, Cuilin 541001, China

机译：球形核壳结构的SiO_2 @ CaMoO_4：Eu〜（3 +），Li〜+红色荧光粉的制备N ^ Gui-hua Peng 药物资源化学与分子工程重点实验室（中国教育部）广西师范大学化学化工学院，崔林541001

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Uniform spherical core-shell structured SiO_2@CaMoO_4:Eu~(3+),Li~+,Li+ phosphors were prepared by a combined homogeneous precipitation approach and combustion synthesis. SiO_2@CaMoO_4:Eu~(3+),Li~+ layer was grown onto submicrometer amorphous SiO_2 particles, which were synthesized by the Stober method, via a homogeneous precipitation technique. The following combustion reaction at 600 °C and simply post-annealing resulted in uniform spherical SiO_2@CaMoO_4:Eu~(3+),Li~+,Li~+ core-shell structured phosphors. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectra (EDS), and photoluminescence (PL). The results show that the amorphous SiO_2 submicrospheres were coated by crystalline SiO_2@CaMoO_4:Eu~(3+),Li~+ nanoparticles, forming spherical core-shell structure with uniform size of~260 nm. The powder samples showed strong red emission corresponding to ~5D_0→ ~77F_2 transitions of Eu~(3+) ions under near ultraviolet (UV) or blue light. Their color coordinate (0.63, 0.36) is close to the standard of national television standards committee (NTSC) (0.67, 0.33).
机译：采用均相沉淀法和燃烧合成相结合的方法，制备了球形核-壳结构均匀的SiO_2 @ CaMoO_4：Eu〜（3 +），Li〜+，Li +荧光粉。 SiO_2 @ CaMoO_4：Eu〜（3 +），Li〜+层生长在亚微米非晶SiO_2颗粒上，该颗粒通过Stober方法通过均相沉淀技术合成。随后在600°C的燃烧反应和简单的后退火得到均匀的球形SiO_2 @ CaMoO_4：Eu〜（3 +），Li〜+，Li〜+核壳结构磷光体。产品通过X射线衍射（XRD），傅里叶变换红外光谱（FT-IR），场发射扫描电子显微镜（FE-SEM），扫描透射电子显微镜（STEM），能量色散X射线光谱（ EDS）和光致发光（PL）。结果表明：无定形SiO_2亚微球被结晶的SiO_2 @ CaMoO_4：Eu〜（3 +），Li〜+纳米粒子包覆，形成球形核-壳结构，尺寸均匀，约为260nm。粉末样品在近紫外（UV）或蓝光下显示出强红色发射，对应于Eu〜（3+）离子的〜5D_0→〜77F_2跃迁。它们的色坐标（0.63，0.36）接近国家电视标准委员会（NTSC）的标准（0.67，0.33）。

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