Synthesis and characterization of monodisperse spherical SiO2@RE2O3 (RE=rare earth elements) and SiO2@Gd2O3:Ln3+ (Ln=Eu, Tb, Dy, Sm, Er, Ho) particles with core-shell structure
Synthesis and characterization of monodisperse spherical SiO2@RE2O3 (RE=rare earth elements) and SiO2@Gd2O3:Ln3+ (Ln=Eu, Tb, Dy, Sm, Er, Ho) particles with core-shell structure
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DOI：
10.1016/j.jssc.2009.07.033
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发表时间：
2009-10
影响因子：
3.3
通讯作者：
Hulin Wang;J. Yang;Cuimiao Zhang;Jinyou Lin
中科院分区：
文献类型：
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作者：
Hulin Wang;J. Yang;Cuimiao Zhang;Jinyou Lin
通过 Pechini 溶胶-凝胶工艺在球形 SiO2 颗粒上涂覆稀土氧化物层，形成核壳结构的 SiO2@RE2O3（RE=稀土元素）和 SiO2@Gd2O3:Ln3+（Ln=Eu、Tb、Dy、Sm、Er、Ho）颗粒。使用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、光致发光（PL）和阴极发光光谱以及寿命来表征所得的SiO2@RE2O3（RE=稀土元素）和SiO2@Gd2O3:Ln3+（Eu3+，Tb3+，Dy3+， Sm3+、Er3+、Ho3+）样品。所得核壳荧光粉形状完美，尺寸分布窄（平均尺寸约380nm），表面光滑，不团聚。通过改变沉积周期的数量（两个沉积周期为 40nm）可以轻松控制壳的厚度。在紫外激发下，Ln3+离子主要在Gd2O3:Ln3+(Eu3+、Tb3+、Sm3+、Dy3+、Er3+、Ho3+)壳层的核壳颗粒中表现出特征发射。
Spherical SiO2particles have been coated with rare earth oxide layers by a Pechini sol–gel process, leading to the formation of core-shell structured SiO2@RE2O3(RE=rare earth elements) and SiO2@Gd2O3:Ln3+(Ln=Eu, Tb, Dy, Sm, Er, Ho) particles. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and cathodoluminescence spectra as well as lifetimes were used to characterize the resulting SiO2@RE2O3(RE=rare earth elements) and SiO2@Gd2O3:Ln3+(Eu3+, Tb3+, Dy3+, Sm3+, Er3+, Ho3+) samples. The obtained core-shell phosphors have perfect spherical shape with narrow size distribution (average size ca. 380nm), smooth surface and non-agglomeration. The thickness of shells could be easily controlled by changing the number of deposition cycles (40nm for two deposition cycles). Under the excitation of ultraviolet, the Ln3+ion mainly shows its characteristic emissions in the core-shell particles from Gd2O3:Ln3+(Eu3+, Tb3+, Sm3+, Dy3+, Er3+, Ho3+) shells.