Evaluating Zn 2 SiO 4 :Mn phosphor for use in medical imaging radiation detectors

Kandarakis, I.; Cavouras, D.; Prassopoulos, Panos; Κανελλόπουλος, Ε.; Nomicos, C.; Panayiotakis, G.

doi:10.1007/s003390050815

Cited by 52 publications

(22 citation statements)

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“…7 ). Because of its unique luminescent properties, wide energy band gap (5.5 eV), and excellent chemical stability, Zn 2 SiO 4 is candidate for flat panel displays, [8][9][10][11][12][13] X-ray or nuclear medical image receptors, X-ray to light converters coupled to optical detectors, 14 etc. Zn 2 SiO 4 forms readily at the interface of ZnO/Si heterostructures.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and optical properties of ZnSiO3 and Zn2SiO4

Karazhanov

Ravindran

Fjellvåg

et al. 2009

Journal of Applied Physics

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The electronic structure and optical properties of orthorhombic, monoclinic, and rhombohedral (corundum type) modifications of ZnSiO 3 , and of rhombohedral, tetragonal, and cubic (spinel type) modifications of Zn 2 SiO 4 have been studied using ab initio density functional theory calculations. The calculated fundamental band gaps for the different polymorphs and compounds are in the range 2.22 -4.18 eV. The lowest conduction band is well dispersive similar to that found for transparent conducting oxides such as ZnO. This band is mainly contributed by Zn 4s electrons. The carrier effective masses were calculated and compared with those for ZnO.The topmost valence band is much less dispersive and contributed by O 2p and Zn 3d electrons.From the analysis of charge-density, charges residing in each sites, and electron localization function it is found that ionic bonding is mainly ruling in these compounds. The calculated optical dielectric tensors show that the optical properties of ZnSiO 3 and Zn 2 SiO 4 are almost isotropic in the visible part of the solar spectra and depend negligibly on the crystal structure. Within the 0-4 eV photon energy range the calculated magnitude of the absorption coefficient, reflectivity, refractive index, and extinction coefficient are smaller than 10 3 cm -1 , 0.15, 2.2, and 0.3, respectively for all 2 the ZnSiO 3 and Zn 2 SiO 4 phases considered in this work. This suggests that zinc silicates can be used as antireflection coatings. 71.15.-m; 71.22.+i PACS:

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Section: Introductionmentioning

confidence: 99%

Electronic structure and optical properties of ZnSiO3 and Zn2SiO4

Karazhanov

Ravindran

Fjellvåg

et al. 2009

Journal of Applied Physics

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“…The decay time, the width of the CT band and efficiency are modified by co-dopants [7][8][9]. In recent years, Zn 2 SiO 4 : Mn has been found to be suitable for many more applications such as thin film electroluminescent (TFEL) devices [10,11], plasma display panels (PDP) [12,13], medical imaging detector for low-voltage radiography and fluoroscopy [14,15], etc. Synthesis of the phosphor was described in detail as early as 1928 [16].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of the Zn2SiO4:Mn Phosphor

Bhatkar

Omanwar

Moharil

2002

phys. stat. sol. (a)

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“…The morphology of the polymer screens was verified by obtaining SEM micrographs using the Jeol JSM 5310 SEM collaborating with the INCA software (JEOL USA, Inc.). The last preparation method was used to achieve higher surface density scintillation screens of about 70 mg/cm 2 [13], using 200 mg of ZnSiO 4 :Mn powder. SEM images of the prepared PMMA/ ZnSiO 4 :Mn composite are presented in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Polymer Based Thin Film Screen Preparation Technique

Valais

Michail

Fountzoula

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. Phosphor screens, mainly prepared by electrophoresis, demonstrate brightness equal to the standard sedimentation on glass or quartz substrate process and are capable of very high resolution. Nevertheless, they are very fragile, the shape of the screen is limited to the substrate shape and in order to achieve adequate surface density for application in medical imaging, a significant quantity of the phosphor will be lost. Fluorescent films prepared by the dispersion of phosphor particles into a polymer matrix could solve the above disadvantages. The aim of this study is to enhance the stability of phosphor screens via the incorporation of phosphor particles into a PMMA (PolyMethyl MethAcrylate) matrix. PMMA is widely used as a plastic optical fiber, it shows almost nearly no dispersion effects and it is transparent in the whole visible spectral range. Different concentrations of PMMA in MMA (Methyl Methacrylate) were examined and a 37.5 % w /w solution was used for the preparation of the thin polymer film, since optical quality characteristics were found to depend on PMMA in MMA concentration. Scanning Electron Microscopy (SEM) images of the polymer screens demonstrated high packing density and uniform distribution of the phosphor particles. This method could be potentially used for phosphor screen preparation of any size and shape.

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Evaluating Zn 2 SiO 4 :Mn phosphor for use in medical imaging radiation detectors

Cited by 52 publications

References 1 publication

Electronic structure and optical properties of ZnSiO3 and Zn2SiO4

Electronic structure and optical properties of ZnSiO3 and Zn2SiO4

Combustion Synthesis of the Zn2SiO4:Mn Phosphor

Polymer Based Thin Film Screen Preparation Technique

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