Different microstructures of ss-NaYF4 fabricated by hydrothermal process: Effects of pH values and fluoride sources
Data(s) |
2007
|
---|---|
Resumo |
beta-NaYF4 microcrystals with a variety of morphologies, such as microrod, hexagonal microprism, and octadecahedron, have been synthesized via a facile hydrothermal route. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and photoluminescence (PL) spectra were used to characterize the samples. The intrinsic structural feature of beta-NaYF4 seeds and two important external factors, namely, the pH values in the initial reaction solution and fluoride sources, are responsible for shape determination of beta-NaYF4 microcrystals. It is found that the organic additive trisodium citrate (Cit(3-)) as a shape modifier has the dynamic effect by adjusting the growth rate of different facets under different experimental conditions, resulting in the formation of the anisotropic geometries of various beta-NaYF4 microcrystals. The possible formation mechanisms for products with various architectures have been presented. A systematic study on the photoluminescence of Tb3+-doped beta-NaYF4 samples with rod, prism, and octadecahedral shapes has shown that the optical properties of these phosphors are strongly dependent on their morphologies and sizes. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Li CX;Yang J;Quan ZW;Yang PP;Kong DY;Lin J.Different microstructures of ss-NaYF4 fabricated by hydrothermal process: Effects of pH values and fluoride sources,CHEMISTRY OF MATERIALS,2007 ,19(20):4933-4942 |
Palavras-Chave | #UP-CONVERSION EMISSION #DOPED NAYF4 NANOCRYSTALS #SOL-GEL SYNTHESIS #LUMINESCENCE PROPERTIES #LAF3 NANOPARTICLES #CRYSTAL-STRUCTURE #OPTICAL-PROPERTIES #HEXAGONAL-PHASE #SOLUTION ROUTE #SHAPE CONTROL |
Tipo |
期刊论文 |