Effect of Bi ion on Eu2+ ↔ Eu3+ conversion in CaF2:Eu phosphors for RPL dosimetry

Dhoble, S.J.; Nagpure, I. M.; Dhoble, N.S.; Molina, P.

doi:10.1007/s10853-011-5685-3

Cited by 17 publications

(5 citation statements)

References 22 publications

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“…Binding energy values were calibrated against the hydrocarbon C 1s line (eV), present because of contamination from ambient air or transport conditions [46][47][48]. Photoluminescence excitation and photoluminescence spectra were acquired using a FluoroMax-4P TCSPC spectrofluorometer produced by Horiba (Horiba Scientific, Kyoto, Japan), containing Czerny-Turner monochromators for excitation and emission.…”

Section: Methodsmentioning

confidence: 99%

Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon

et al. 2017

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Abstract:The phosphor powders of Ca (m/2)−x Eu x Si 12−(m+n) Al m+n O n N 16−n (m = 1.6, n = 0.8, x in the range of 0-0.08) were synthesized by means of a solid state reaction in flowing nitrogen in a carbon resistant furnace and the influence of Eu concentration on the crystal structure and photoluminescent properties was thoroughly studied. The optical properties of selected α-sialon:Eu 2+ samples at temperatures in the range of 10 to 500 K and pressures up to 240 kbar are presented. The crystal lattice parameters were affected by doping with europium and some increase of the unit cell volume was observed up to 6 mol % of Eu. The higher concentration of europium led to subtle changes in the overall structure of the produced sialon phosphors. It was shown that the chemical composition of Ca, Eu-α-sialon phosphor was slightly different from the designed one and the phosphor powders were contaminated by AlN. The phosphor particle surface showed significant europium and oxygen enrichment with Eu 3+ but below the thin surface layer Eu 2+ was dominant and higher nitrogen content was observed. After examination of absorption, excitation, and emission spectra it was found that the emission peak position shifted toward longer wavelengths with rising Eu 2+ concentration from 565 nm (0.1 mol % Eu 2+ ) to 585 nm (10 mol % Eu 2+ ). The quantum yield of the phosphors reached the maximum at a rather low concentration of 4 mol % of Eu. Excitation spectra depend on the monitored wavelength which is typical for multisite Eu 2+ . The existence of many Eu 2+ sites in the sample was supported by the dependence of the decay time on the monitored wavelength.

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Section: Methodsmentioning

confidence: 99%

Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon

et al. 2017

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“…Rare-earth-activated inorganic/organic materials have been widely used in white light emission, lasers, RPL dosimetry, drug delivery and optical & MRI imaging. [1][2][3][4][5][6] The photoluminescence (PL) observed in these materials is attributed to the f-f or f-d transitions of rare-earth ions and the intensity depends on the site symmetry and the nature of the host matrix. Oxide-based phosphors have received considerable attention for use in atpanel displays due to their luminescent characteristics, stability in high vacuums, and the absence of corrosive gas emission under electron bombardment, as compared to currently used sulde-based phosphors.…”

Section: Introductionmentioning

confidence: 99%

Bluish white emitting Sr2CeO4 and red emitting Sr2CeO4:Eu3+ nanoparticles: optimization of synthesis parameters, characterization, energy transfer and photoluminescence

et al. 2013

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“…After the transfer of Eu 2+ →Eu 3+ along the ion track is complete [21], the collected luminescence can remain constant as the particle fluence is increased, assuming that the transparency loss of the activator luminescence is negligible. However, further experiments will be needed to verify this hypothesis.…”

Section: Scintillation Yield Responsementioning

confidence: 99%

Investigation of ion induced damage in KBr, YAG:Ce, CaF₂:Eu and CsI:Tl irradiated by various-energy protons

et al. 2015

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New experimental results on the scintillation processes for KBr, YAG:Ce, CaF 2 :Eu and CsI:Tl crystals under H 2 + irradiation for the energy range of 600-2150 keV/u are systematically reported. The scintillation light yield was measured as a function of accumulated particle fluence at the rare isotope ReAccelerator (ReA) facility of the National Superconducting Cyclotron Laboratory (NSCL). The data indicates that YAG:Ce and CsI:Tl can maintain stable luminescence under continuous ion bombardment for at least a total fluence of 1.8×10 12 ions/mm 2 in the energy range used for this experiment. On the other hand, the luminescence of CaF 2 :Eu shows a rapid initial decay but then maintains a nearly constant luminescence yield. The extraordinary scintillation response of KBr is initially enhanced under ion bombardment, approaches a maximum, and then eventually decays. The scintillation efficiency of the CsI:Tl scintillator is superior to the other materials. The stability of the measured beam profile width deducted from the different scintillator materials in static beam conditions was also investigated as a function of irradiation time. We observed that the low-energy H 2 + bombardment (25 keV/u) on the YAG:Ce scintillator can lead to the significant degradation of the scintillation yields. Different scintillation degradation responses for the low-and high-energy bombardments can be attributed to the transmission loss of the emitted light inside the crystal caused by displacement damages.

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Effect of Bi ion on Eu2+ ↔ Eu3+ conversion in CaF2:Eu phosphors for RPL dosimetry

Cited by 17 publications

References 22 publications

Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon

Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon

Bluish white emitting Sr2CeO4 and red emitting Sr2CeO4:Eu3+ nanoparticles: optimization of synthesis parameters, characterization, energy transfer and photoluminescence

Investigation of ion induced damage in KBr, YAG:Ce, CaF₂:Eu and CsI:Tl irradiated by various-energy protons

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Effect of Bi ion on Eu2+ ↔ Eu3+ conversion in CaF2:Eu phosphors for RPL dosimetry

Cited by 17 publications

References 22 publications

Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon

Dopant Concentration Induced Optical Changes in Ca,Eu-α-Sialon

Bluish white emitting Sr2CeO4 and red emitting Sr2CeO4:Eu3+ nanoparticles: optimization of synthesis parameters, characterization, energy transfer and photoluminescence

Investigation of ion induced damage in KBr, YAG:Ce, CaF2:Eu and CsI:Tl irradiated by various-energy protons

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Investigation of ion induced damage in KBr, YAG:Ce, CaF₂:Eu and CsI:Tl irradiated by various-energy protons