Synthesis , luminescence and effect of anneal temperature on chromaticity of YVO4:Dy3+ nanorods

摘要

Dy3+-doped YVO4 nanorods were synthesized via a modified hydrothermal route in pentanol-water mixtures at 150℃. The structures and optical properties of the products were investigated using the X-ray powder diffraction, transmission electron microscopy, and photoluminescence spectroscopy. The results showed that these nanorods with average particle size of from 20nm to 600nm might be fabricated through the growth of the large particles which is favored by the dissolution of the small particles. The photoluminescence (PL) measurements showed that these nanorods exhibited improved chromaticity compared with YVO4:Dy3+ irregular nanoparticles. It can be ascribed to the perfect crystal structure of nanorods. From PL spectra, it is inferred that YVO4:Dy3+ nanorods annealed at higher temperature have higher ratio of yellow (4F9/2 → 6H13/2) to blue (4F9/2 →6H15/2) emissions, which ascribe to high site symmetry resulting from the crystallite size and crystallization increased.