Physical and optical studies of Gd2 O2 S:Eu3+ nanophosphors by microwave irradiation and γ-irradiation methods

Luminescence. 2019 Nov;34(7):699-706. doi: 10.1002/bio.3655. Epub 2019 Jul 11.

Abstract

Gd2 O2 S:Eu3+ nanophosphors have been successfully synthesized using microwave irradiation and γ-irradiation methods with polyvinyl pyrrolidone as a stabilizer. The physical and luminescence spectra were compared. The morphologies of both Gd2 O2 S:Eu3+ nanophosphors were in the hexagonal phase and mainly consisted of spherical nanostructures with diameters of ~90 nm and ~50 nm for both microwave irradiation and γ-irradiation methods. Upon 325 nm of ultraviolet (UV) light excitation, strong red emissions (626 nm) were observed for both methods; these emissions corresponded to the 5 D07 F2 transition of Eu3+ ions. However, Gd2 O2 S:Eu3+ nanophosphors following microwave treatment showed better luminescence intensity than Gd2 O2 S:Eu3+ nanophosphors treated with γ-irradiation. This difference was attributed to the crystallinity phase and surface quenching effects of Gd2 O2 S:Eu3+ nanophosphors. The reaction mechanisms of Gd2 O2 S:Eu3+ nanophosphors in both methods are discussed in detail.

Keywords: microwave; nanophosphors; optical and physical; γ-irradiation.

MeSH terms

  • Europium / chemistry*
  • Gadolinium / chemistry*
  • Gamma Rays*
  • Microwaves*
  • Nanostructures / chemistry*
  • Optical Phenomena
  • Particle Size
  • Sulfur / chemistry*

Substances

  • Europium
  • gadolinium oxide
  • Sulfur
  • Gadolinium