Controllable Fabrication and Optical Properties of Uniform Gadolinium Oxysulfate Hollow Spheres

Abstract

Uniform gadolinium oxysulfate (Gd2O2SO4) hollow spheres were successfully fabricated by calcination of corresponding Gd-organic precursor obtained via a facile hydrothermal process. The Gd2O2SO4 hollow spheres have a mean diameter of approximately 550 nm and shell thickness in the range of 30–70 nm. The sizes and morphologies of as-prepared Gd2O2SO4 hollow spheres could be deliberately controlled by adjusting the experimental parameters. Eu-doped Gd2O2SO4 hollow spheres have also been prepared for the property modification and practical applications. The structure, morphology, and properties of as-prepared products were characterized by XRD, TEM, HRTEM, SEM and fluorescence spectrophotometer. Excited with ultraviolet (UV) pump laser, successful downconversion (DC) could be achieved for Eu-doped Gd2O2SO4 hollow spheres.

Physical and optical studies of Gd2O2S:Eu3+ nanophosphors by microwave irradiation and γ‐irradiation methods

“…These could be related to the surface enrichment and enhancement by the thermal agitation of liquid molecules. This process led PVP and ethylene glycol to form a stable Gd complex through hydrolysis reactions . The strong interaction between PVP and the surface of the Gd complex through coordination using van der Waals bonding with the O and N atoms of the pyrrolidone ring allowed isotropic growth to form stable spherical nanophosphors …”

Regulating Mid-infrared to Visible Fluorescence in Monodispersed Er3+-doped La2O2S (La2O2SO4) Nanocrystals by Phase Modulation

“…Their NIR emission is also demonstrated with measured quantum yield higher than 100% in Er 3+ /Yb 3+ co-doped La 2 O 2 S30. Lanthanide oxysulfate RE 2 O 2 SO 4 also displays a unique fluorescent property activated by rare earth (Eu 3+ , Er 3+ , Ce 3+ and so forth)313233. Eu 3+ : Y 2 O 2 SO 4 offers 3 times stronger emission compared to the its oxide counterpart Eu 3+ : Y 2 O 3 34.…”

Template-free hydrothermal synthesis of Gd2O2SO4:Eu3+ hollow spheres based on urea-ammonium sulfate (UAS) system

“…So a considerable effort has been devoted to the development of different methods for the design and fabrication of hollow structures. In general, synthetic methods toward hollow spheres can be sorted into two types: template strategies [7][8][9] and template-free strategies [10]. At present, most of the systems reported for the formation of hollow spheres were based on template-assisted processes, which often employ sacrificial template (hard or soft templates) to obtain hollow spheres.…”