Abstract
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.
Original language | English |
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Pages (from-to) | 457-463 |
Number of pages | 7 |
Journal | Journal of the Australian Ceramic Society |
Volume | 53 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Oct 2017 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2017 Australian Ceramic Society.
Keywords
- GdOSO sub-micron particles
- Phosphorescence
- Scintillator
- Sol-gel
- X-ray imaging