Sol-gel synthesis, characterization, and photoluminescence properties of sub-micron Gd2O2SO4 powders

ARİTMAN İ., YILDIRIM S., EBEOĞLUGİL M. F., YURDDAŞKAL M., ERTEKİN K., ÇELİK E.

Journal of the Australian Ceramic Society, vol.53, no.2, pp.457-463, 2017 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 53 Issue: 2
  • Publication Date: 2017
  • Doi Number: 10.1007/s41779-017-0055-5
  • Journal Name: Journal of the Australian Ceramic Society
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.457-463
  • Keywords: Gd2O2SO4 sub-micron particles, Phosphorescence, Scintillator, Sol-gel, X-ray imaging
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

Abstract

© 2017 Australian Ceramic Society.The advanced phosphorescent Gd2O2SO4 (GOS) sub-micron powders were successfully synthesized through a sol-gel method utilizing commercially available Gd(CH3CO2)3.xH2O, (NH4)2SO4, and CO(NH2)2 as precursors. GOS phosphors were characterized by differential thermal analysis-thermogravimetry (DTA-TG), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analyzer (PSA), and time-resolved spectrometer (TRS). The results showed that the samples calcinated at different temperatures from 950 to 1200 °C were composed of the different Gd-based phases. All analyzes confirmed that pure Gd2O2SO4 crystalline structure was produced at 950 and 1000 °C. However, this structure deteriorated over 1000 °C. At temperature range of 1100 and 1200 °C, Gd2O3 and Gd2S3 structures were observed in the powder. The powders at 950 °C exhibit a surface morphology smaller than 1 μm. In a fully deoxygenated moiety, when excited at 356 nm, the phosphors exhibited well-shaped narrow emission bands centered at 542 nm and biexponential decay times. The phosphorescence of the material was oxygen resistive and wavelength dependent.