synthesis and characterization of gd2o2 s: tb^3+ phosphor powder for x-ray imaging detectors

Gadolinium oxysulfide phosphor doped with trivalent terbium have been synthesized using urea homogenous precipitation and followed by sulfurization at 800 °c under argon atmosphere. structural and morphological of synthesized phosphor powder were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem) and fourier transform infrared spectrometry (ft-ir). hexagonal structure of gd2o2s:tb3+ phosphor was confirmed by xrd. compositional analysis was carried out by energy dispersive x-ray (edx) and particle induced x-ray emission (pixe). photoluminescence emission spectra was measured by the fluorescent spectrometer. a sedimentation technique is used to deposit the phosphor powder directly on the glass substrate using poly vinyl alcohol as a paste. a number of phosphor layers have been synthesized with the layer thickness ranging from 150 to 268 μm. measurement results of x-ray conversion efficiency for layers were investigated using 300 kvp x-ray tube in which the maximum light output and contrast were observed for the layer with a thickness of 193 μm. oxysulfide phosphor layer was analyzed by ion beam induced luminescence (ibil). emitting of green light from phosphor layer confirms its luminescence property.