New X-ray phosphors

Brixner, L.H.

doi:10.1016/0254-0584(87)90102-7

Cited by 186 publications

(91 citation statements)

References 17 publications

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“…To illustrate this, YTO has three crystal structures and presents a complex polymorphism such as high temperature tetragonal (up to 1400 ℃ scheelite, T-structure), low temperature monoclinic (1200-1300 ℃ fergusonite, M-structure), and another monoclinic form called M′ that can be synthesized at lower temperatures. By heating process, M′ phase could transform to T phase, which could transform into M phase during the cooling stage [4]. The two monoclinic crystalline phases including M and M′ exhibit different structural arrangements.…”

Section: Introductionmentioning

confidence: 99%

“…Yttrium tantalate (YTaO 4 , YTO) and yttrium niobate (YNbO 4 , YNO) are efficient as X-ray phosphors utilized in medical imaging. These phosphors which could be used in electronic detector systems and also in films/screen cassettes, fluoroscopy, tomography, and radiography, may also be induced with lower energy sources such as electrons or ultraviolet (UV) light [3][4][5][6]. Performances of these phosphors are strongly connected with crystalline structure, composition, particle dimensions, and luminescence behaviours.…”

Section: Introductionmentioning

confidence: 99%

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Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

et al. 2017

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were produced by sol-gel method and grown on single crystalline Si (100) substrate by spin coating approach. Structural properties and thermal behaviours of the films were characterized by means of X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and thermogravimetry and differential thermal analysis (TG-DTA). Systematic Steady-state photoluminescence and lifetime measurements in a series of yttrium niobium-tantalate with varying amounts of Eu 3+ were presented. The photoluminescence spectra of the films exhibited strong blue (380-400 nm) and red (614 nm) emissions upon ultraviolet excitation. Emission intensities were strongly dependent on the host lattice composition and film morphology. 1.5% Eu 3+ doped films exhibited the brightest luminescence and long lifetime extending to 1.22 ms when excited at 254 nm. To the best of our knowledge, this is the first attempt in the production of M′-YTO, M′-YTNO, and M′-YTNO:Eu 3+ films on single crystalline Si (100) substrate via sol-gel spin coating.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

et al. 2017

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“…Crystals of the matlockite (PbFCl) family have been the subject of numerous investigations with respect to a variety of potential applications such as room temperature hole burning [1], radiation detection [2] and pressure sensors [3]. More recently, the compound PbFCl has been studied as scintillator material [4].…”

Section: Introductionmentioning

confidence: 99%

Mixed PbFBr_1−xI_xcrystals: structural and spectroscopic investigations

Hagemann

Rief

Kübel

et al. 2007

J. Phys.: Condens. Matter

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Mixed single PbFBr 1−x I x crystals have been prepared. X-ray powder diffraction structure determinations show that all samples crystallize with the matlockite structure. However, the single crystal structure of PbFBr 0.5 I 0.5 involves not only fractional occupation of one site corresponding to the stoichiometry, but also split positions of the Pb 2+ ion. Raman spectra reveal the presence of new additional bands with respect to PbFBr and PbFI. DFT calculations of lattice vibrations for PbFI show good agreement with experimental spectra. The calculated phonon dispersion curve suggests that for the mixed crystals the centre of inversion is conserved locally. These combined results suggest the presence of domains with ordered F-Pb-Br-Br-Pb-F and F-Pb-I-I-Pb-F layers in the mixed crystals. Calculations on PbFBr 0.5 I 0.5 show that this suggested structure is more stable than the structure consisting of the F-PbBr-I-Pb-F arrangement.

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“…Los fósforos han sido ampliamente estudiados desde la década de los 70 [3][4][5][6]. En estos trabajos se encontró mediante refinación que el tantalato de itrio tiene 3 estructuras cristalinas, una tetragonal (estructura T) a altas temperaturas (>1450 °C), una monoclínica (estructura M) a bajas temperaturas (<1400 °C), y otra patrón de difracción.…”

Section: Introductionunclassified

Caracterización morfológica de YTaO4 y YNbO4 dopadas con Eu3+ y Tb3+.

Ramírez

Osorio

Nazarov³

2016

prospect

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RESUMENEn este artículo se describe y se aplica el método de Rietveld para el refinamiento de dos estructuras cristalinas, tantalato de itrio (YTaO 4 ) y tantalato de niobio (YNbO 4 ). Estas estructuras se doparon con iones Eu 3+ (Europio) y Tb 3+ (Terbio) usando el método de reacción de estado sólido. Posteriormente fueron refinadas y comparadas con las estructuras sin dopaje. La morfología de los granos del YTaO 4 y YNbO 4 se estudiaron mediante microscopía electrónica de barrido y las estructuras fueron caracterizadas por difracción de rayos X (DRX). Se demuestra que la incorporación de los iones (Eu 3+ y Tb 3+ ) no cambia el tipo de estructura de estos fósforos, sino que aumenta el volumen de la celda unitaria de acuerdo a la ley de Vegard. Además, se simula la estructura cristalina de ambos fósforos mediante el software libre Balls & Sticks.Palabras clave: Difracción de rayos X; Estructura cristalina; Método de Rietveld; YTaO 4 y YNbO 4 . ABSTRACTThis article describes and applies the Rietveld method for the refinement of two different crystalline structures, yttrium tantalate (YTaO 4 ) and yttrium niobate (YNbO 4 ). These structures were doped with Eu 3+ (Europium) and Tb 3+ (Terbium) ions using the solid state reaction method. Subsequently, they were refined and compared with the structures without doping. The grain morphology of YTaO 4 and YNbO 4 were studied by X-ray diffraction (XRD) and scanning electron microscopy. The incorporation of ions (Eu 3+ and Tb 3+ ) does not change the crystalline structure, but rather, increases the volume of the unit cell, according to Vegard´s law. Moreover, from the crystallographic data the crystalline structure of the phosphors is simulated using free software Balls & Sticks.

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New X-ray phosphors

Cited by 186 publications

References 17 publications

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

Mixed PbFBr_1−xI_xcrystals: structural and spectroscopic investigations

Caracterización morfológica de YTaO4 y YNbO4 dopadas con Eu3+ y Tb3+.

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New X-ray phosphors

Cited by 186 publications

References 17 publications

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

Mixed PbFBr1−xIxcrystals: structural and spectroscopic investigations

Caracterización morfológica de YTaO4 y YNbO4 dopadas con Eu3+ y Tb3+.

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Mixed PbFBr_1−xI_xcrystals: structural and spectroscopic investigations