Abstract

The sandwich structure core–shell–shell nanospheres SiO 2@(Y,Gd)BO 3:Eu 3+@SiO 2 (SiO 2@YGB@SiO 2) have been synthesized by depositing YGB nanoparticles on silica core surface through the precipitation method, followed by sol–gel processing of tetraethoxysilane (TEOS) to form smooth silica shell over the surface of YGB. The phosphors were characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), transmission electronic microscope (TEM) and photoluminescence spectra. The results showed that the phosphors with spherical morphology can be produced easily by assembling the core–shell or core–shell–shell structure, and the XRD patterns indicated that the crystallinity of YGB is weakened due to the core–shell structure, which resulting from the local site symmetry of Eu 3+ was decreased. The photoluminescence properties of the product are compared with those of the pure YGB, the core–shell structure SiO 2@YGB and YGB@SiO 2. The emission intensity, relative luminous efficiency and Red/Orange values of phosphors are increased in the order SiO 2@YGB@SiO 2>SiO 2@YGB>YGB@SiO 2>YGB; and the chromaticity coordinates of the phosphors are shifted from orange of pure YGB to red of SiO 2@YGB@SiO 2.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.