Optical, scintillation and dosimeter properties of MgO translucent ceramic doped with Cr3+

Kato, Takumi; Okada, Go; Yanagida, Takayuki

doi:10.1016/j.optmat.2016.02.030

Cited by 45 publications

(10 citation statements)

References 45 publications

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“…The E g of MNPs was remarkably lower than the energy band gap from the standard value of Eg in the bulk state (7.8 eV) due to red-shifted from the standard. This was related to the [19,20]. Also, these results were in good match with other previous works which used pure precursor for the synthesis of MgO nanostructures [1,5,[21][22][23][24].…”

Section: Optical Propertiessupporting

confidence: 90%

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Yousefi

Ghasemi

2020

SN Appl. Sci.

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In this paper, MgO nanoparticles (MNPs) were synthesized using simple wet chemical precipitation technique from evaporative brine as Mg ions precursor. The effect of NaOH concentration on morpho-structural and optical properties of as-synthesized nanoparticles was studied. The obtained nanoparticles were characterized by X-ray Diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDS), fourier transform infrared spectroscopy and UV-Vis absorption spectroscopy. The obtained structural properties (from XRD analysis) indicated that MNPs had pure cubic phase, high crystallinity, and average crystallite size and were in good agreement with TEM and FESEM characteristics. Also, increasing the concentration of the precipitator resulted in reduced crystallites size (from 37.09 to 17.61 nm), nanoparticles size (from 35-88 nm to 22-75 nm), and strain value (from 1.23 × 10-3 to 0.57 × 10-3). The optical properties of MNPs including absorption (A), transmittance (T), absorption coefficient (α), optical band gap energy (E g), Extinction coefficient (k), and refractive index (n) were investigated using UV-Vis spectroscopy and examined in details.

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Section: Optical Propertiessupporting

confidence: 90%

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Yousefi

Ghasemi

2020

SN Appl. Sci.

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“…The spectrum of 3d-3d and 4d-4d (d-d) transitions has a broad luminescence feature, and the decay time is typically on the ms order. Among the transitional metal elements, Mn 2+ 65 and Cr 3+ 66 are sometimes selected for scintillation detectors due to a good spectral matching with Si-PD.…”

Section: Recent Randd Progress Of Scintillatorsmentioning

confidence: 99%

Inorganic scintillating materials and scintillation detectors

Yanagida

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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384

167

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Scintillation materials and detectors that are used in many applications, such as medical imaging, security, oil-logging, high energy physics and non-destructive inspection, are reviewed. The fundamental physics understood today is explained, and common scintillators and scintillation detectors are introduced. The properties explained here are light yield, energy non-proportionality, emission wavelength, energy resolution, decay time, effective atomic number and timing resolution. For further understanding, the emission mechanisms of scintillator materials are also introduced. Furthermore, unresolved problems in scintillation phenomenon are considered, and my recent interpretations are discussed. These topics include positive hysteresis, the co-doping of non-luminescent ions, the introduction of an aimed impurity phase, the excitation density effect and the complementary relationship between scintillators and storage phosphors.

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“…We are primarily concerned with our wavelengths of interest (800 nm and 400 nm). Cr: MgO has shown that transmission of optical light decreases overall with increasing doping concentration [21], relevant for both our wavelengths of interest.…”

Section: Doping Impact On the Yield Of Shgmentioning

confidence: 93%

Controlling the non-linear optical properties of MgO by tailoring the electronic structure

et al. 2020

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The study of the non-linear response of matter to high electric fields has recently encompassed harmonic generation in solids at near-infrared (NIR) driving wavelengths. Interest has been driven by the prospect of ultrafast signal processing and all-optical mapping of electron wavefunctions in solids. Engineering solid-state band structures to control the non-linear process has already been highlighted theoretically. Here, we show experimentally for the first time that second harmonic generation (SHG) can be enhanced by doping crystals of magnesium oxide (MgO) with chromium (Cr) atoms. We show that the degree of enhancement depends nonlinearly on dopant concentration. The SHG efficiency is shown to increase when Cr dopants are introduced into pure MgO. A physical picture of the effect of Cr dopants is aided by density functional theory (DFT) calculations of the electronic structure for pure and doped samples. This work shows an unambiguous enhancement of the SHG efficiency by modifying the electronic structure. The observed effects are consistent with an electronic structure that facilitates the surface induced SHG and demonstrates a minimal angular dependence. This work highlights the potential of manipulating the electronic structure of solids to control or test theories of their non-linear optical response.

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Optical, scintillation and dosimeter properties of MgO translucent ceramic doped with Cr3+

Cited by 45 publications

References 45 publications

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Inorganic scintillating materials and scintillation detectors

Controlling the non-linear optical properties of MgO by tailoring the electronic structure

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