title: Spherical SiO2 @ GdPO4: Eu3+ core-shell phosphors: sol-gel synthesis and characterization.
abstract: Nanocrystalline GdPO4 : Eu3+ phosphor layers were coated on non-aggregated, monodisperse and spherical SiO2 particles by Pechini sol-gel method, resulting in the formation of core-shell structured SiO2 @ GdPO4 : Eu3+ particles. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), photoluminescence (PL), low-voltage cathodoluminescence (CL), time-resolved PL spectra and lifetimes were used to characterize the core-shell structured materials. Both XRD and FT-IR results indicate that GdPO4 layers have been successfully coated on the SiO2 particles, which can be further verified by the images of FESEM and TEM. Under UV light excitation, the SiO2 @ GdPO4 : Eu3+ phosphors show orange-red luminescence with Eu3+ 5D0-7F1 (593 nm) as the most prominent group. The PL excitation and emission spectra suggest that an energy transfer occurs from Gd3+ to Eu3+ in SiO2 @ GdPO4 : Eu3+ phosphors. The obtained core-shell phosphors have potential applications in FED and PDP devices.
authors: Key laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
authors: Cuikun
authors: C
authors: Lin
authors: Bo
authors: B
authors: Zhao
authors: Zhenling
authors: Z
authors: Wang
authors: Min
authors: M
authors: Yu
authors: Huan
authors: H
authors: Wang
authors: Deyan
authors: D
authors: Kong
authors: Jun
authors: J
authors: Lin
mesh_terms: D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003460:Crystallization; D005063:Europium / Q000737:chemistry* / Q000528:radiation effects; D005682:Gadolinium / Q000737:chemistry* / Q000528:radiation effects; D005782:Gels; D008027:Light; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008863:Microspheres; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D044367:Phase Transition; D010777:Photochemistry / Q000379:methods; D011208:Powders; D012822:Silicon Dioxide / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D020099:Coated Materials, Biocompatible; D005782:Gels; D011208:Powders; D005063:Europium; D012822:Silicon Dioxide; D005682:Gadolinium