Abstract
Silica-coated Tm 3+, Yb 3+, Li +-tridoped Gd 2O 3 nanocrystals (GTYLS) were prepared by a reverse microemulsion method. The blue upconversion luminescence intensity of this nanocomposite was enhanced remarkably by the incorporation of Li + ions as compared with that of lithium-free Gd 2O 3:Tm 3+, Yb 3+@SiO 2 (GTYS) nanocomposites. X-ray diffraction patterns (XRD) of GTYS and GTYLS revealed that Gd 2O 3 were cubic, silica shell was noncrystalline. The transmission electron microscope (TEM) photographs showed that the core of GTYLS was crystalline with the size of 50–60 nm, and the size of silica shell was about 15 nm. FT-IR spectra indicated that the absorption bands of OH became weaker with increasing the concentration of Li +. The enhanced luminescence is due to the distortion of the local asymmetry around Tm 3+ and the decrease of OH generated by Li + ion incorporation in the lattices.
Sign-in/Register to access full text options 
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 callDisclaimer: 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.
