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Synthesis and characterization of Gd2O2 S: Tb3+ phosphor powder for X-ray imaging detectors مقاله

نویسنده مسئول:


علمی-پژوهشی (وزارت علوم) (7 صفحه - از 616 تا 622)


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 were carried out by energy dispersive x-ray (EDX) and particle induced x-ray emission (PIXE). Photoluminescence emission spectra was measured by 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 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 confirm its luminescence property.

کلیدواژه ها:

Synthesis ، Phosphor ، X-ray detector ، Terbium doped gadolinium oxysulfide

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