Spectrokinetic characteristics of the emission of Gd2O2S-Tb(Ce) ceramics

Gorokhova, E. I.; Demidenko, V. A.; Eron’ko, S. B.; Khristich, O. A.; Mikhrin, S. B.; Родный, П. А.

doi:10.1364/jot.72.000053

Cited by 12 publications

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“…Among them are an ease of fabrication, low cost, fabrication of large size elements, large concentration and homogeneous distribution of dopants. The R 2 O 2 S was studied recently as fluorescent ceramics [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Oxysulfide optical ceramics doped by Nd3+ for one micron lasing

Orlovskii¹,

Basiev²,

Pukhov³

et al. 2007

Journal of Luminescence

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Section: Introductionmentioning

confidence: 99%

Oxysulfide optical ceramics doped by Nd3+ for one micron lasing

Orlovskii¹,

Basiev²,

Pukhov³

et al. 2007

Journal of Luminescence

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“…As shown by a study by the authors of this article on thermally stimulated luminescence of Gd 2 O 2 S ceramics, a distinct correlation is observed between the afterglow intensity and the concentration of trapping centers. [2][3][4] It has been shown ( Fig. 6(b)) that heat treatment in air of Gd 2 O 2 S:Pr,Ce and Gd 2 O 2 S:Tb ceramics results in a significant reduction of their afterglow.…”

Section: Resultsmentioning

confidence: 98%

“…1 This paper presents a review of data based on x-ray structural analysis and the study of the microstructure and transparency of Gd 2 O 2 S:RE ceramics (RE = Pr, Tb, Eu) and obtained by investigating its spectrokinetic characteristics. [2][3][4] …”

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confidence: 99%

Scintillation optical ceramics based on Gd_2O_2S doped with Pr, Tb, or Eu

et al. 2012

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This paper discusses the structural, optical, and spectrokinetic characteristics of ceramics based on gadolinium oxysulfide Gd 2 O 2 S:RE (RE = Pr, Tb, Eu), obtained by the method of uniaxial hot pressing. It is shown that the composition and conditions of hot pressing affect the parameters of the Gd 2 O 2 S lattice and the formation of the predominant grain orientation in the (001) plane of the pinacoid. All the ceramics possess transparency that is high for an anisotropic material (about 40% at a thickness of 1.65 mm) in the intrinsic emission region. The overall x-ray luminescence intensities (relative to CsI:Tl) for the Gd 2 O 2 S:Pr,Ce, Gd 2 O 2 S:Tb(Ce), and Gd 2 O 2 S:Eu ceramics are 50, 160 (120), and 200%, respectively, while the damping time constants are 3.2, 600-700, and 450 µs, respectively.The high density (7.34 g/cm 3 ), relatively small band gap (4.3 eV), and conformity to the requirements on absorption in a wide range of energies of gadolinium oxysulfide (Gd 2 O 2 S), make it promising for use in modern devices of x-ray medical engineering as a matrix for obtaining a scintillation material. Doping this matrix with ions having variable valence, Eu 2+,3+ , Tb 3+,4+ , and Pr 3+,4+ , and possessing a large damping cross section (>10 −14 cm 2 ) ensures a high conversion efficiency of the phosphors, as well as making it possible to vary the spectral composition and radiationdamping time. Powdered phosphors based on Gd 2 O 2 S doped with these elements have been widely used for a long time to record x-ray, UV, and electron radiation, and this explains why their characteristics have been studied fairly deeply. The situation is different for studies of single-crystal and optical polycrystalline-ceramic scintillation materials. There is virtually no information on the former because of problems in obtaining single crystals of Gd 2 O 2 S. As far as ceramic materials are concerned, the scintillation characteristics of Gd 2 O 2 S:Pr,Ce ceramics, which are being actively used in detectors for computerized tomography, have been studied in the greatest detail. 1 This paper presents a review of data based on x-ray structural analysis and the study of the microstructure and transparency of Gd 2 O 2 S:RE ceramics (RE = Pr, Tb, Eu) and obtained by investigating its spectrokinetic characteristics. 2-4 EXPERIMENTAL TECHNIQUEThe process of uniaxial hot pressing (HP) of the samples was carried out in high-temperature vacuum furnaces. The original powders used in this paper, a characteristic image of which is shown in Fig. 1(a), had a grain size of 3-7 µm. The concentration of the dopants (Pr 3+ , Tb 3+ , Eu 3+ ) fluctuated within the limits 0.08-1.0 mass%, and the Ce 3+ concentration was 0.002 mass%. Since Gd 2 O 2 S is a refractory compound (T m ≈ 2250 • C), to achieve high density and transparency of the ceramic, the pressing process was carried out in the presence of an easily melted fluorine-containing additive, which simultaneously served the function of supplying the F − ion needed to obtain the required luminesce...

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“…GOS-based ceramic scintillators have been fabricated by hot pressing (HP) [ 14 , 16 , 17 ], hot isostatic pressing (HIP) [ 18 ], spark plasma sintering [ 19 ], and pressureless sintering in hydrogen/nitrogen atmosphere [ 20 , 21 ]. Although HP/HIP sintering has low requirements in terms of particle sinterability, the disadvantages lie in low efficiency and expensive cost.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Green-Emitting Gd2O2S:Pr3+ Phosphor Nanoparticles and Fabrication of Translucent Gd2O2S:Pr3+ Scintillation Ceramics

2020

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A translucent Gd2O2S:Pr ceramic scintillator with an in-line transmittance of ~31% at 512 nm was successfully fabricated by argon-controlled sintering. The starting precipitation precursor was obtained by a chemical precipitation route at 80 °C using ammonia solution as the precipitate, followed by reduction at 1000 °C under flowing hydrogen to produce a sphere-like Gd2O2S:Pr powder with an average particle size of ~95 nm. The Gd2O2S:Pr phosphor particle exhibits the characteristic green emission from 3P0,1→3H4 transitions of Pr3+ at 512 nm upon UV excitation into a broad excitation band at 285–335 nm arising from 4f2→4f5d transition of Pr3+. Increasing Pr3+ concentrations induce two redshifts for the two band centers of 4f2→4f5d transition and lattice absorption on photoluminescence excitation spectra. The optimum concentration of Pr3+ is 0.5 at.%, and the luminescence quenching type is dominated by exchange interaction. The X-ray excited luminescence spectrum of the Gd2O2S:Pr ceramic is similar to the photoluminescence behavior of its particle. The phosphor powder and the ceramic scintillator have similar lifetimes of 2.93–2.99 μs, while the bulk material has rather higher external quantum efficiency (~37.8%) than the powder form (~27.2%).

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Spectrokinetic characteristics of the emission of Gd2O2S-Tb(Ce) ceramics

Cited by 12 publications

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Oxysulfide optical ceramics doped by Nd3+ for one micron lasing

Oxysulfide optical ceramics doped by Nd3+ for one micron lasing

Scintillation optical ceramics based on Gd_2O_2S doped with Pr, Tb, or Eu

Synthesis of Green-Emitting Gd2O2S:Pr3+ Phosphor Nanoparticles and Fabrication of Translucent Gd2O2S:Pr3+ Scintillation Ceramics

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