Photoluminescence and photostimulated luminescence of BaFBr:Eu Eu2+,Eu3+

Chen, Wei; Su, Mian-Zeng

doi:10.1063/1.118204

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…The heat treatment phenomenon suggests that these emissions are likely from some defects because it is very common that defects are bleached by heat treatment. [35][36][37][38] Besides, we noticed four characteristic emissions of Eu 3þ at 596 nm, 617 nm, 652 nm, and 699 nm, which are corresponding to the transitions of Eu 3þ excited 5 D 0 level to the 7 F J (J ¼ 1,2,3, and 4) levels, respectively. 39 very weak and there are almost no changes in intensity before and after the heating (Figure 6(b)).…”

Section: Discussionmentioning

confidence: 94%

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection

Jiang

Liu

et al. 2014

Journal of Applied Physics

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Articles you may be interested inTunable emission in surface passivated Mn-ZnS nanophosphors and its application for Glucose sensing AIP Advances 2, 012183 (2012); 10.1063/1.3698310Temperature and pressure behavior of the emission bands from Mn-, Cu-, and Eu-doped ZnS nanocrystalsWe prepared manganese and europium co-doped zinc sulfide (ZnS:Mn,Eu) phosphors and used them for radiation detection. In addition to the red fluorescence at 583 nm due to the d-d transition of Mn ions, an intense violet emission at 420 nm is newly observed in ZnS:Mn,Eu phosphors. The emission is related to Eu 2þ doping but only appears at certain Eu 2þ concentrations. It is found that the intensity of the 420 nm violet fluorescence is X-ray does-dependent, while the red fluorescence of 583 nm is not. The ratio of fluorescence intensities at 420 nm and 583 nm has been monitored as a function of X-ray doses that exposed upon the ZnS:Mn,Eu phosphors. Empirical formulas are provided to estimate the doses of applied X-ray irradiation. Finally, possible mechanisms of X-ray irradiation induced fluorescence quenching are discussed. The intense 420 nm emission not only provides a violet light for solid state lighting but also offers a very sensitive method for radiation detection. V C 2014 AIP Publishing LLC. [http://dx.

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Section: Discussionmentioning

confidence: 94%

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection

Jiang

Liu

et al. 2014

Journal of Applied Physics

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“…All these indicate that the PSL model for the oxidation of Eu 2+ to Eu 3+ upon radiation and the reduction of Eu 3+ to Eu 2+ upon stimulation are questionable as pointed out by many investigators. [6][7][8][9] C. Thermoluminescence in BaFCl:Eu 2+ . After X-ray irradiation at LNT, the main glow peak appeared at 170 K, and weaker peaks were observed at approximately 220 and 270 K (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

“…This might indicate that the conversion of some Eu 2+ ions to Eu 3+ ions by radiation does not happen as pointed out by several groups. [5][6][7][8]29 Instead, the creation of color centers, excitons, and oxygen defects play a key role in the storage luminescence.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, they questioned the argument that Eu 2+ is converted into Eu 3+ during X-ray irradiation. The observations of Su et al − also demonstrate that Eu 2+ ions did not change their valence state and that the molar ratio of Eu 2+ /Eu 3+ holds constant during X-ray irradiation or photostimulation. Thus, the interconversion model of Eu 2+ ↔ Eu 3+ is questionable.…”

Section: Introductionmentioning

confidence: 83%

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X-Ray Storage Luminescence of BaFCl:Eu²⁺ Single Crystals

Chen¹,

Kristianpoller

Shmilevich

et al. 2005

J. Phys. Chem. B

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Temperature behaviors of X-ray luminescence (XL), photoluminescence (PL), photostimulated luminescence, and thermoluminescence (TL) were studied in BaFCl:Eu2+ single crystals from room temperature to liquid nitrogen temperature. Six emissions at 275, 315, 365, 385, 435, and 500 nm were observed in the XL spectra and are attributed to Cl excitons, V(k)(Cl2-), the 4f65d1 (2e(g)) --> 4f7 (8S(7/2)) transition of Eu2+, and oxygen vacancies, respectively. Three emission peaks at 315, 365, and 390 nm were observed in the PL and TL measurements. These three emissions are from the transitions of 4f7(6I(7/2)) --> 4f7(8S(7/2)), 4f7(6P(7/2)) --> 4f7(8S(7/2)), and 4f65d1 (2e(g)) --> 4f7(8S(7/2)) of Eu2+, respectively. In our measurements, we observed that the emission of Eu2+ increases in intensity upon beta-irradiation and did not see any signals related to Eu3+ ions, which indicates that Eu2+ ions might not be oxidized to Eu3+ upon X-ray or beta-irradiation. Instead, the color centers, Cl excitons, and oxygen defects are created and are stable at room temperature, and they might play a key role in the storage luminescence.

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“…PL, defined as a spontaneous light emission following excitation 21,23 , is a distinct phenomenon from OSL. Through this process, the BaFBr:Eu phosphor can be excited at a wavelength of ~300 nm to emit in the 350 – 420 nm range.…”

Section: Methodsmentioning

confidence: 99%

Flexible optically stimulated luminescence band for 1Din vivoradiation dosimetry

Kim¹,

Jung²,

Fahimian³

et al. 2018

Phys. Med. Biol.

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In vivo dosimetry helps ensure the accuracy of radiation treatments. However, standard techniques are only capable of point sampling, making it difficult to accurately measure dose variation along curved surfaces in a continuous manner. The purpose of this work is to introduce a flexible dosimeter band and validate its performance using pre-clinical and clinical x-ray sources. Dosimeter bands were fabricated by uniformly mixing BaFBr:Eu storage phosphor powders into a silicone based elastomer. An optical readout device with dual-wavelength excitation was designed and built to correct for non-uniform phosphor density and extract accurate dose information. Results demonstrated significant correction of the non-uniform readout signal and excellent dose linearity up to 8 Gy irradiation using a pre-clinical 320 kV x-ray system. Beam profile measurements were demonstrated over a long distance of ~30 cm by placing multiple dosimeters in a single line and stitching the results. The performance of the dosimeters was also tested using a clinical linear accelerator (6 MV) and compared to radiochromic film. Once bias corrected, the bands displayed a linear dose response over the 1.02-9.36 Gy range (R > 0.99). The proposed system can be further improved by reducing the size of the readout beam and by more uniformly mixing the phosphor powder with the elastomer. We expect this technique to find application for large-field treatments such as total-skin irradiation and total-body irradiation.

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Photoluminescence and photostimulated luminescence of BaFBr:Eu Eu2+,Eu3+

Cited by 10 publications

References 12 publications

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection

X-Ray Storage Luminescence of BaFCl:Eu²⁺ Single Crystals

Flexible optically stimulated luminescence band for 1Din vivoradiation dosimetry

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Photoluminescence and photostimulated luminescence of BaFBr:Eu Eu2+,Eu3+

Cited by 10 publications

References 12 publications

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection

X-Ray Storage Luminescence of BaFCl:Eu2+ Single Crystals

Flexible optically stimulated luminescence band for 1Din vivoradiation dosimetry

Contact Info

Product

Resources

About

X-Ray Storage Luminescence of BaFCl:Eu²⁺ Single Crystals