Synthesis and Characterization of Gd2O2SO4:Pr3+ Scintillation Material Produced by Sol-Gel Process for Digital Imaging System (original) (raw)
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Synthesis and Characterization of Gd2O2S:Pr3+ Nanophosphors using Gamma Irradiation Method
Sains Malaysiana
Praseodymium ion, Pr 3+ doped Gd 2 O 2 S nanophosphors were successfully synthesized via gamma irradiation route along with the heat treatment. The effect of the gamma irradiation (0-150 kGy) on the structural, morphology and photoluminescence properties of Gd 2 O 2 S:Pr 3+ were characterized via X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and photoluminescence spectroscopy (PL). The thermal properties of precursor sample were tested by the thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The chemical bonding of the precursor samples were analyzed by Fourier transform infrared spectroscopy (FT-IR). The XRD result confirmed the formation of hexagonal phase of Gd 2 O 2 S:Pr 3+ without the presence of any impurities. The FESEM inspection showed the non-symmetrical shape of particles transformed into grain-like shape. The optimum photoluminescence (PL) emission intensities of Gd 2-x O 2 S:xPr 3+ occur at 50 kGy dose of gamma irradiation and 2 mol% concentration dopant of Pr 3+ ions. The spectra under 325 nm UV excitation shows a strong green emission at 515 nm, which match the 3 P 0 → 3 H 4 transition of Pr 3+ ions. The Gd 2 O 2 S:Pr 3+ nanophosphors possessed many useful approaches in various applications mainly as radiation detection and biomedical diagnostic.
Synthesis and characterization of Gd2O2 S: Tb3+ phosphor powder for X-ray imaging detectors
2019
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 maxim...
AIP Conference Proceedings
Radiographic imaging which transforms y or x rays into visible light is one of the most important developments in the field of digital imaging systems in recent years. Materials consisting of rare earth elements have strong scintillation properties in digital radiology. Gd2O2SO4 is studied due to having effective magnetic properties and excellent luminescence spectra. Additionally, Gd2O2SO4:Eu 3+ has thermal stability and ideal red light emission performance with peak emission at around 618 nm when activated under X-ray or ultraviolet light. In this study, Gd2O2SO4:Eu 3+ nanoparticles were synthesized by sol-gel method and were calcined at 950 o C in argon gas atmosphere. In the analysis of the produced nanoparticles XRD, SEM, XPS and optical luminescence devices were used to evaluate the results.
Evaluation of Gd2O2S:Pr granular phosphor properties for X-ray mammography imaging
Journal of Luminescence, 2016
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 Gd 2 O 2 S:Tb 3+ 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.
Synthesis and Characterization of Doped Ceramic Scintillators Based on (Gd,Y)/sub 2/O/sub 3
Journal of Approximation Theory, 2005
From the measured X-ray luminescence spectra, the Gd1.94-x YxEu0.06O3 ceramics with x=0.4 showed the highest emission luminescence. Also both excitation and emission spectra measured at room temperature were higher than that at 11 K. The decay characteristics measured by laser luminescence showed that the decay time was about 1.2 msec at 11 K and it did not change much by increasing ambient temperature. From the results of the X-ray luminescence spectra measurement, it was also found that Eu and Li co-doping certainly increased the light output in the powder form but substantially the light output decreased in the ceramic form, which was considered due to the creation of defects in the sintering process. Therefore a further tuning procedure of the sintering process worthwhile to investigate for making better (Gd,Y)2O3 ceramic scintillator
Luminescence quenching processes in Gd2O2S:Pr3+,Ce3+ scintillating ceramics
Optical Materials, 2011
Temperature dependent radioluminescence under X-ray excitation (XRL) and luminescence decay time measurements following 430 nm laser excitation have been performed in the 10-775 K range on Gd 2 O 2 S:Pr 3+ ,Ce 3+ scintillating ceramics. From 200 K to both low and high temperature, XRL light yield decreases by 60%. High temperature luminescence quenching has been revisited. Temperature dependent lifetime measurements imply non-radiative de-excitation mechanism at electronic defects spatially correlated to Pr 3+ emitting ions. At low temperatures, decreasing XRL light yield with irradiation time is linked to very intense thermoluminescence (TL) peak around 120 K ascribed to sulfur vacancies. These traps cause efficient electron trapping which competes with the prompt recombination mechanism.
ReviewArticle Sol-Gel Processing of Nanostructured Inorganic Scintillating Materials
2007
The development of scintillating materials is believed to reach a new step by controlling their preparation on a nanometric level. Sol-Gel chemistry offers very unique tools for nanoscale mastering of the materials preparation. In particular, shaping of the materials as thin films or nanoparticles offers new application in medical imaging. The control of doping ions dispersion thanks to soft chemistry is also a great advantage of such synthetic routes. In this paper, we will review recent work devoted to the sol-gel preparation of inorganic scintillating materials. We will focus on the new possibilities and advantages offered by sol-gel chemistry for the preparation of new scintillators and improvement of existing ones.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011
a b s t r a c t X-ray imaging detectors in combination with scintillator screens have been widely used in digital X-ray imaging applications. Gd 2 O 2 S:Tb was used as scintillation material for pixelated scintillator screens based on silicon substrates (wafer) with a micropore array of various dimensions fabricated using the photolithography and deep reactive ion etching (DRIE) process. The relative light output and the modulation transfer function (MTF) of each fabricated scintillator screen were measured by a cooled CCD and compared with those of Lanex screens. The spatial resolution of our scintillator screens was higher but their light outputs were lower than those of Lanex screen probably due to the loss of light at the wall surfaces. Therefore further treatment of the wall surface, such as reflective coating, seems necessary to compensate the light loss.