A review report on medical imaging phosphors

Kaur, Jaspreet; Parganiha, Yogita; Dubey, Vikas; Singh, Deepti

doi:10.1007/s11164-013-1132-1

Cited by 23 publications

(12 citation statements)

References 26 publications

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“…The width of the peak increases as the size of the crystallite decreases. The size of the crystals has been computed from the full width half maximum (FWHM) of the intense peak using Scherer formula [30][31][32][33][34]. Crystallite size of sample in the range 58 nm is found.…”

Section: Resultsmentioning

confidence: 99%

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Tiwari¹,

Dubey

Kuraria³

2016

J Fluoresc

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Behaviour displayed by mechanoluminescence (ML) in CaZrO3:Eu(3+) doped phosphors with variable concentration of europium ions are described. When the ML is excited impulsively by the impact of a load on the phosphors the ML intensity increases with time, attains a maximum value and then it decreases. In the ML intensity versus time curve, the peak increases and shifts towards shorter time values with increasing impact velocities. Sample was synthesized by combustion synthesis method with variable concentration of Eu(3+) ions (0.1, 0.2, 0.5, 1, 1.5 mol%) and characterized by X-ray diffraction technique. The total ML intensity IT is defined as the area below the ML intensity versus time curve. Initially IT increases with impact velocity V0 of the load and then it attains a saturation value for higher values of impact velocities which follow the relation IT = IT (0) exp.(-Vc/V0) where IT (0) and Vc are constants. Total ML intensity increases linearly with the mass of the phosphors for higher impact velocities. The ML intensity Im, corresponding to the peak of ML intensity versus time curve increases linearly with the impact velocities. The time tm, is found to be linearly related to 1000/V0. The mechanoluminescence induced by impulsive excitation in europium doped CaZrO3 phosphors plays a significance role in the understanding of biological sensors and display device application.

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Section: Resultsmentioning

confidence: 99%

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Tiwari¹,

Dubey

Kuraria³

2016

J Fluoresc

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“…This concentration quenching is due to increased ion–ion interaction, provoked by the shorter distance between the interacting activators as the concentration increases. The fluorescence light spectral profile as a function of activator concentration was examined and the results indicated that the chromaticity coordinates of the overall emission light changed, resulting in different colours for the overall emission light at different concentrations . The CIE coordinates were calculated using a spectrophotometric method with the spectral energy distribution of the CeO 2 :Er 3+ (1.5%) sample (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Infrared and visible emissions of rare‐earth‐doped CeO₂ phosphor

Chandrakar¹,

Kaur²,

Dubey³

et al. 2015

Luminescence

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This paper reports the synthesis and characterization of Er(3+)-doped CeO2 phosphor with variable concentrations of erbium. The sample was synthesized using a solid-state reaction method, which is useful for the large-scale production of phosphors and is also eco-friendly. The prepared sample was characterized using an X-ray diffraction (XRD) technique. The XRD pattern confirmed that sample has the pure cubic fluorite crystal structure of CeO2. The crystallite size of the prepared phosphor was determined by Scherer's formula and the crystallite size giving an intense XRD peak is 40.06 nm. The surface morphology of the phosphor was determined by field emission gun scanning electron microscopy (FEGSEM). From the FEGSEM image, good surface morphology with some agglomerates was found. The functional group in the prepared sample was analysed by Fourier transform infrared (FTIR) spectroscopy. All samples prepared with variable concentrations of Er(3+) (0.1-2 mol%) were studied by photoluminescence analysis and it was found that the excitation spectra of the prepared phosphor shows broad excitation centred at 251 nm. Emission spectra at different concentrations of Er(3+) show strong peaks at 413 and 470 nm and a weaker peak at 594 nm. The dominant peaks at 413 and 470 nm are caused by the allowed electronic transition (4)S3/2 → (4)I15/2 and the weaker transition at 594 nm is due to the transition (4)F9/2 → (4)I15/2. Spectrophotometric determinations of peaks were evaluated using the Commission Internationale de I'Eclairage (CIE) technique. The emission spectra were also observed using an infrared (IR) laser 980 nm source, and three distinct peaks were found in the IR region at 848, 870 and 980 nm. The prepared phosphor has utility for application in display devices.

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“…Computed tomography is a tomography in which a computer controls the motion of an X‐ray source and detectors to produce the image. [ 33–35 ] Computed tomography using luminescence phosphors consists of an array of photodiodes that are used instead of a screen. When X‐rays bombarded on phosphor produces visible light, the emitted visible light is sensed by the photodiode.…”

Section: Introductionmentioning

confidence: 99%

A review: X‐ray excited luminescence of gadolinium based optoelectronic phosphors

Mahakhode¹,

Nande²,

Dhoble

2021

Luminescence

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X‐ray excited fluorescence tomography is an emerging field in the application of bio‐imaging and computer tomography. Some rare‐earth doped inorganic phosphors like gadolinium oxide (Gd2O3), yttrium oxide (Y2O3), zinc tungstate (ZnWO4), cesium fluoride (CsF), barium fluorochloride (BaFCl), lanthanum oxybromide (LaOBr) are shown outstanding applications for X‐ray excited phosphors. Gadolinium (Gd)‐based inorganic phosphors show extraordinary applications in the field of X‐ray chromatography and computer chromatography. In this review article, we discussed the general information about X‐ray excited luminescence (XEL) phosphor. Further, we discussed importance, synthesis, structural and photoluminescence (PL) properties of rare‐earth (Europium (Eu)) doped Gd2O3. To elaborate the scope of the review, we have discussed synthesis, structural and optical properties of lithium (Li) doped Gd2O3:Eu. At the end of the review, synthesis, structural and optical properties of Eu doped lutetium oxide (Lu2O3) have been discussed and the results compared with Eu doped Gd2O3. The comparison provided the understanding of structural and optical peak position of host and the dopant (Eu).

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A review report on medical imaging phosphors

Cited by 23 publications

References 26 publications

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Infrared and visible emissions of rare‐earth‐doped CeO₂ phosphor

A review: X‐ray excited luminescence of gadolinium based optoelectronic phosphors

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A review report on medical imaging phosphors

Cited by 23 publications

References 26 publications

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Infrared and visible emissions of rare‐earth‐doped CeO2 phosphor

A review: X‐ray excited luminescence of gadolinium based optoelectronic phosphors

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Infrared and visible emissions of rare‐earth‐doped CeO₂ phosphor