Correlated PL, TL and EPR study in γ-rays and C6+ ion beam irradiated CaMg2(SO4)3:Dy3+ triple sulphate phosphor

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LiMgBO 3 :Dy 3+ , a low Z eff material was prepared using the solution combustion method and its luminescence properties were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermoluminescence (TL), photoluminescence (PL), Fourier transform infrared spectroscopy, and electron paramagnetic resonance (EPR) techniques. Reitvield refinement was also performed for the structural studies.The PL emission spectra for LiMgBO 3 :Dy 3+ consisted of two peaks at 478 due to the 4 F 9/2 → 6 H 15/2 magnetic dipole transition and at 572 nm due to the hypersensitive 4 F 9/2 → 6 H 13/2 electric dipole transition of Dy 3+ , respectively. A TL study was carried out for both the γ-ray-irradiated sample and the C 5+ irradiated samples and was found to show high sensitivity for both. Moreover the γ-ray-irradiated LiMgBO 3 :Dy 3+ sample showed linearity in the dose range 10 Gy to 1 kGy and C 5+ -irradiated samples show linearity in the fluence range 2 × 10 10 to 1 × 10 11 ions/cm 2 . In the present study, the initial rise method, various heating rate method, the whole glow curve method, glow curve convolution deconvolution function, and Chen's peak shape method were used to calculate kinetic parameters to understand the TL glow curve mechanism in detail. Finally, an EPR study was performed to examine the radicals responsible for the TL process. KEYWORDS ESR, LiMgBO 3 , tissue equivalent material, trapping parameters | INTRODUCTIONBoron-based materials show interesting thermoluminescence (TL) properties when exposed to ionizing radiation [1,2] . The luminescence properties of lithium borate and magnesium borate in both microcrystalline and nanocrystalline forms have been studied previously [1][2][3][4] . Recently, researchers who studied lithium magnesium borate phosphor found that it was useful for applications in dosimetry [5,6] .To date, only a few studies on LiMgBO 3 have been reported [5] .Recently, the TL properties of rare earth ion (RE = Tb, Gd, Dy, Pr, Mn, Ce, Eu)-doped lithium magnesium borate (LMB), prepared using the solid state diffusion method, have been documented [6] . LMB:Tb 3+ showed the best results with a stable TL peak at 240°C. LMB:Tb 3+ was about four times more sensitive than TLD-100. Optical properties of LMB glasses doped with Dy 3+ ,Sm 3+ ions have been studied [7] .Photoluminescence properties of LMB:Eu and LMB:Eu,Bi have also been studied in detail [8] . LiMgBO 3 :Dy 3+ in its polycrystalline form has been prepared using a novel solution combustion method and its TL sensitivity was found to be half compared with commercial TLD-100 and showed a high degree of fading of 30% after 20 days [9] . Furthermore, LiMgBO 3 :Dy 3+ in its nanocrystalline form has been prepared using the combustion method and its structural and optical properties have been studied [10] .

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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Luminescence study of LiMgBO₃:Dy for γ‐ray and carbon ion beam exposure

Yerpude

Chopra²,

Dhoble³

et al. 2019

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“…[ 7–11 ] One important factor that affects the dosimetric characteristics of many TL materials is the heating rate, which reveals change in location as well as shape and size of the glow curve. [ 12 ] Various rare earth‐activated sulphate‐based phosphors such as KCaSO 4 Cl:Ce,Dy, [ 13 ] Na 6 (SO 4 ) 2 FCl:Dy, [ 14 ] K 2 Ca 2 (SO 4 ) 3 :Eu, [ 15 ] K 3 Na(SO 4 ) 2 :Eu, [ 16 ] K 2 Mg(SO 4 ) 2 :Dy, [ 17 ] Ca 2 Mg 2 (SO 4 ) 3 :Dy, [ 18 ] and Ka 3 Ca 2 (SO 4 ) 3 F:Eu,Ce [ 19 ] have been studied extensively to improve their TL properties and to obtain reasonable responses for TL characteristics. In principle, irradiation of sulphate materials leads to the formation of SO 4 − SO 2 − , O 3 − , or O − radicals that combine with holes/electrons on heating, resulting in the emission of light.…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence dosimetry properties and kinetic analysis of K₃Ca₂(SO₄)₃F:Dy³⁺ phosphor

Mehare

Mehare²,

Ghanty³

et al. 2020

A trivalent Dy3+‐activated K3Ca2(SO4)3F fluoride‐based phosphor was synthesized using a solid‐state reaction method and characterized for its thermoluminescence (TL) application. The crystal structure and surface morphology of the as‐synthesized material was analyzed using X‐ray diffraction and scanning electron microscopy. A series of the K3Ca2(SO4)3F:Dy3+ phosphor was irradiated using γ‐rays from a 60Co source and TL glow curves were recorded using a Nucleonix 1009I TL reader. The glow curve of the prepared phosphor showed a prominent single peak at 278°C. TL characteristics were maximum intensity at 1 mol% of Dy3+ ion with a single TL glow peak. The TL glow curve revealed linearity with increase in exposure dose range from 0.1 kGy to 3.0 kGy. Theoretical analysis of the TL glow curve of the γ‐ray‐irradiated sample was carried out using a computerized glow curve deconvolution method and trapping parameters such as activation energy and frequency factor were calculated using the initial rise method and Ilich’s method. The synthesized Dy3+‐doped K3Ca2(SO4)3 phosphor revealed excellent TL properties and was found to be a potential candidate for dosimetric applications.

“…The aluminate SrYAl 3 O 7 is the type of phosphor used in this study. Some reports have described that materials have photoluminescence (PL) and thermoluminescence (TL) properties when doping with same dopant . A Eu 3+ ‐doped SrYAl 3 O 7 phosphor displayed excellent TL properties when irradiated using γ‐rays from a 60 Co source.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescence study of Eu³⁺‐doped SrYAl₃O₇ phosphor

Kadam

Dhoble

2019

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Rare-earth ions play an important role in eco-friendly solid-state lighting for the lighting industry. In the present study we were interested in Eu 3+ ion-doped inorganic phosphors for near ultraviolet (UV) excited light-emitting diode (LED) applications.Eu 3+ ion-activated SrYAl 3 O 7 phosphors were prepared using a solution combustion route at 550°C. Photoluminescence characterization of SrYAl 3 O 7 :Eu 3+ phosphors showed a 612 nm emission peak in the red region of the spectrum due to the 5 D 0 → 7 F 2 transition of Eu 3+ ions under excitation at 395 nm in the near-UV region and at the 466 nm blue excitation wavelength. These red and blue emissions are supported for white light generation for LED lighting. Structure, bonding between each element of the sample and morphology of the sample were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), which showed that the samples were crystallized in a well known structure. The phosphor was irradiated with a 60 Co-γ (gamma) source at a dose rate of 7.2 kGy/h. Thermoluminescence (TL) studies of these Eu 3+ -doped SrYAl 3 O 7 phosphors were performed using a Nucleonix TL 1009I TL reader. Trapping parameters of this phosphor such as activation energy (E), order of kinetics (b) and frequency factor (s) were calculated using Chen's peak shape method, the initial rise method and Ilich's method.