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首页> 外文期刊>Nanotechnology >Sol-gel synthesis and photoluminescence properties of spherical SiO2@LaPO4 : Ce3+/Tb3+ particles with a core-shell structure
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Sol-gel synthesis and photoluminescence properties of spherical SiO2@LaPO4 : Ce3+/Tb3+ particles with a core-shell structure

机译：具有核-壳结构的球形SiO2 @ LaPO4：Ce3 + / Tb3 +颗粒的溶胶-凝胶合成和光致发光性能

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摘要

LaPO4: Ce3+ and LaPO4: Ce3+, Tb3+ phosphor layers have been deposited successfully on monodispersed and spherical SiO2 particles of different sizes ( 300, 500, 900 and 1200 nm) through a sol - gel process, resulting in the formation of core - shell structured SiO2@ LaPO4: Ce3+/ Tb3+ particles. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microcopy (SEM), transmission electron microscopy (TEM), and general and time-resolved photoluminescence (PL) spectra as well as lifetimes were used to characterize the resulting SiO2@ LaPO4: Ce3+/ Tb3+ samples. The XRD results demonstrate that the LaPO4: Ce3+, Tb3+ layers begin to crystallize on the SiO2 templates after annealing at 700 degrees C, and the crystallinity increases on raising the annealing temperature. The obtained core - shell phosphors have perfectly spherical shape with a narrow size distribution, non-agglomeration, and a smooth surface. The doped rare-earth ions show their characteristic emission in the core - shell phosphors, i.e. Ce3+ 5d - 4f and Tb3+5D4 - F-7(J) (J = 6 - 3) transitions, respectively. The PL intensity of the Tb3+ increased on increasing the annealing temperature and the SiO2 core particle size. The energy transfer process from Ce3+ to Tb3+ in SiO2@ LaPO4: Ce3+, Tb3+ core - shell particles was studied using the time-resolved emission spectra.
机译：LaPO4：Ce3 +和LaPO4：Ce3 +，Tb3 +荧光粉层已通过溶胶-凝胶工艺成功沉积在不同大小（300、500、900和1200 nm）的单分散球形SiO2颗粒上，形成了核-壳结构SiO2 @ LaPO4：Ce3 + / Tb3 +颗粒。使用X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM），透射电子显微镜（TEM）以及常规和时间分辨光致发光（PL）光谱以及寿命来进行分析表征所得的SiO2 @ LaPO4：Ce3 + / Tb3 +样品。 XRD结果表明，在700摄氏度下退火后，LaPO4：Ce3 +，Tb3 +层开始在SiO2模板上结晶，并且结晶度随着退火温度的升高而增加。所获得的核-壳磷光体具有完美的球形形状，具有窄的尺寸分布，无团聚和光滑的表面。掺杂的稀土离子在核-壳磷光体即Ce3 + 5d-4f和Tb3 + 5D4- F-7（J）（J = 6-3）跃迁中分别显示出它们的特征发射。 Tb3 +的PL强度随着退火温度和SiO2核粒径的增加而增加。用时间分辨发射光谱研究了SiO2 @ LaPO4中Ce3 +到Tb3 +的能量转移过程：Ce3 +，Tb3 +核-壳颗粒。

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