کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1332177 | 979032 | 2008 | 7 صفحه PDF | دانلود رایگان |

The core–shell structured YNbO4:Eu3+/Tb3+@SiO2 particles were realized by coating the YNbO4:Eu3+/Tb3+ phosphors onto the surface of spherical silica via a sol–gel process. The obtained materials were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform IR spectroscopy (FT-IR), photoluminescence (PL) spectra, and cathodoluminescence (CL) spectra. The results indicate that 600 °C annealed samples consist of amorphous silica core and crystalline YNbO4:Re shell, having perfect spherical morphology with uniform size distribution. Upon excitation by UV or electron beam, these phosphors show the characteristic 5D0–7F1–4 emission lines of Eu3+ and the characteristic 5D4–7F3–6 emission lines of Tb3+. The PL intensities of Eu3+ can be tuned by altering the annealing temperature and the coating number of YNbO4:Eu3+ layers.
YNbO4:Eu3+/Tb3+ layers were deposited on spherical SiO2 particles via a sol–gel process, resulting in the formation of core–shell structured YNbO4:Eu3+/Tb3+@SiO2 phosphors. The luminescence properties of phosphors in the core–shell particles can be tuned by altering the annealing temperature and the coating layers of the phosphors.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 181, Issue 8, August 2008, Pages 1943–1949