Radiation-induced changes in the optical properties of NaMgF 3 (Sm): Observation of resettable Sm radio-photoluminescence

Schuyt, J.J.; Williams, G. V. M.

doi:10.1016/j.materresbull.2018.06.039

Cited by 28 publications

(67 citation statements)

References 31 publications

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“…21,22 Furthermore, lanthanide ions doped into NaMgF 3 polycrystalline samples have also been prepared by the conventional solid-state reaction method. 23,24 In fact, lanthanide incorporation in compounds has been largely used to enhance luminescent properties.…”

Section: Introductionmentioning

confidence: 99%

Defect clustering in an Eu-doped NaMgF₃ compound and its influence on luminescent properties

2021

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Section: Introductionmentioning

confidence: 99%

Defect clustering in an Eu-doped NaMgF₃ compound and its influence on luminescent properties

2021

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“…Usually, the quenching temperature for Yb 2+ emission is low but in NaMgF 3 , quenching is observed even at room temperature. The luminescence of trivalent rare earths such as Ce 3+ , [ 21 ] Pr 3+ , [ 22,23 ] Yb 3+ , Er 3+ , [ 24,25 ] Gd 3+ , [ 26 ] Eu 3+ , [ 27 ] Sm 3+ , [ 28 ] Dy 3+[ 29 ] has also been reported. NaMgF 3 :Yb 3+ , Er 3+ are good candidate host materials for red upconversion luminescence.…”

Section: Introductionmentioning

confidence: 99%

“…[ 43 ] As well as OSL, radiophotoluminescence (RPL) due to Sm 3+ ⇋ Sm 2+ redox reactions is also useful for dosimetry. [ 28 ] Recently, NaMgF 3 :Dy 3+ and NaMgF 3 :Nd 3+ were suggested for use in fibre optic dosimetry applications. [ 44 ]…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

Singh¹,

Belsare²,

Moharil

2021

Luminescence

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NaMgF3‐based phosphors have been described frequently in the literature. Their synthesis faces difficulties typical of fluoride materials. A simple precipitation synthesis for NaMgF3‐based phosphors is described in this paper. This consisted of mixing aq. NaF and MgCl2/MgSO4 solutions. Various activators could be incorporated by adding the required salts during this process. Characteristic emission of the activators was observed in the prepared phosphors. As‐prepared samples exhibited predominantly trivalent lanthanide emission. After thermal treatment in a reductive atmosphere, europium‐doped samples showed the intense emission of Eu2+. By virtue of the intense nature of the emission, lifetime measurements could be made for this sample. Notably, intense thermoluminescence and optically stimulated luminescence were observed in NaMgF3:Eu. A simple, fast method for the synthesis of NaMgF3 was therefore developed.

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“…Here, the state of the art of dosimetry is briefly discussed, primarily in terms of the different devices used for dose detection. There are many dosimeters available commercially [20,21,[39][40][41], and a far greater number of materials currently being researched and developed for eventual dosimeter applications [42][43][44][45][46][47][48]. This reality reflects the range of circumstances in which radiation dose monitoring is required.…”

Section: Modern Dosimetersmentioning

confidence: 99%

“…The standard example of RPL is one of valence conversion, e.g. the radiation-induced reduction of a trivalent ion, D 3+ , to its divalent state, D 2+ , where D 2+ exhibits PL under an appropriate optical excitation [43] (figure 2.6 (b)). RPL therefore provides a very straightforward means of measuring radiation doses, as the emission intensity of the RPL centre will generally increase with total radiation dose up to some saturation dose.…”

Section: Radiophotoluminescencementioning

confidence: 99%

The Effect of Ionising Radiation on the Luminescence Properties of Fluoroperovskites

Schuyt¹

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<p>The luminescence of crystalline compounds can be used to monitor many physical phenomena, including doses of ionising radiation. Optically stimulated luminescence (OSL), thermoluminescence (TL), and radiophotoluminescence (RPL) have been successfully employed in dosimetry. However, few materials possess both the structural and luminescence properties required for medical dosimetry. This thesis aimed to investigate the luminescence features of the class of compounds known as fluoroperovskites. Emphasis was placed on studying the effects of irradiation on the luminescence properties, such that the compounds could be evaluated regarding potential applications in clinical dosimetry. Samples were primarily characterised using photoluminescence (PL), radioluminescence (RL), OSL, RPL, TL, and transmittance spectroscopy. OSL was observed in the majority of samples due to the existence of electron trapping F-type centres. F-centre/Mn complexes were observed in all AMgF3:Mn compounds after irradiation and the energy levels of the complexes in each compound were experimentally determined. The most promising potential dosimeter host material was the near tissue-equivalent NaMgF3. When doped with Mn2+, the compound exhibited RPL via the formation of F-centre/Mn complexes and OSL via several trapping centres. The RPL could be probed independently to the OSL such that the compound could function as a hybrid OSL/RPL dosimeter. In the NaMgF3:Ln compounds, RPL occurred via the radiation-induced reduction Ln3+ → Ln2+ for Ln = Sm, Dy, and Yb. The reduction Sm3+ → Sm2+ was highly stable and could be non-destructively probed independently to the OSL. The Sm doped compound also exhibited radiation-induced conductivity that could be coupled with the RL, such that the compound could function as a real-time hybrid optical/electrical dosimeter. Charge kinetics, thermal quenching, and binding energy models were developed and applied to the compounds. Finally, a two-dimensional readout system was designed and constructed. The capabilities of the system were evaluated using the OSL of NaMgF3:Eu and NaMgF3:Mn. Sensitivities to doses from < 10 mGy to > 1 Gy were obtained along with sub-millimetre spatial resolutions.</p>

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Radiation-induced changes in the optical properties of NaMgF 3 (Sm): Observation of resettable Sm radio-photoluminescence

Cited by 28 publications

References 31 publications

Defect clustering in an Eu-doped NaMgF₃ compound and its influence on luminescent properties

Defect clustering in an Eu-doped NaMgF₃ compound and its influence on luminescent properties

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

The Effect of Ionising Radiation on the Luminescence Properties of Fluoroperovskites

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Radiation-induced changes in the optical properties of NaMgF 3 (Sm): Observation of resettable Sm radio-photoluminescence

Cited by 28 publications

References 31 publications

Defect clustering in an Eu-doped NaMgF3 compound and its influence on luminescent properties

Defect clustering in an Eu-doped NaMgF3 compound and its influence on luminescent properties

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF3

The Effect of Ionising Radiation on the Luminescence Properties of Fluoroperovskites

Contact Info

Product

Resources

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Defect clustering in an Eu-doped NaMgF₃ compound and its influence on luminescent properties

Defect clustering in an Eu-doped NaMgF₃ compound and its influence on luminescent properties

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃