Effect of anion interstitials on the thermoluminescent properties of CaSO4:Dy

Lakshmanan, A.; Sivakumar, V.; Rani, Ruchi; Kalpana, S.

doi:10.1016/j.jlumin.2013.03.051

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…Whereas,

{normalV}_{normalX}^{2 -}

would act as hole traps and might appear near the valence band edge. [ 48 ]…”

Section: Resultsmentioning

confidence: 99%

“…Whereas, V 2À X would act as hole traps and might appear near the valence band edge. [48] On comparing the gamma-irradiated TL signals of Dy doped and pure SrZnO 2 (Figure 2d), it was found that the pure sample was lacking features B and C. [18] Feature A and D were assigned to shallow defect centers and oxygen vacancy-related deep defect centers, respectively. However, feature C was observed in pure SrZnO 2 synthesized by monoethanolamine fuel.…”

Section: Resultsmentioning

confidence: 99%

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Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Manju

Jain

Savita

et al. 2021

Physica Status Solidi (a)

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Thermoluminescence (TL) analysis of gamma‐irradiated SrZnO2:Dy nanophosphors elucidates the presence of various trapping centers in forbidden band. Raman and Fourier‐transformed infrared spectra indicate effect on vibrational structure upon doping. Complex glow curves are obtained at varying gamma radiation doses, exhibiting glow features in low (50–180 °C) and high (220–400 °C) temperature regions. The deconvolution of glow curves indicates the presence of TL peaks at ≈100, 143, 202, 269, and 337 °C. The effect of Dy doping is observed as emergence of new glow feature at ≈143 °C. The substitution of trivalent Dy into SrZnO2 host having divalent cations is proposed to be creating DynormalX1+ (X = Sr, Zn) electron traps and normalVnormalX2− hole traps, along with hitherto existing intrinsic defects. The concentration quenching of TL signal is perceived at 3 mol% Dy doping, whereas comparing glow curves for all samples at saturation dose indicate quenching of low‐ and high‐temperature glow features at different doping concentrations. The theoretical track interaction model and empirical three trap one recombination center (3T1R) model is used to explain former and latter effects, respectively. A schematic band model is proposed to predict the trap distribution upon Dy inclusion, responsible for observed TL in SrZnO2:Dy nanophosphors.

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“…Whereas,

{normalV}_{normalX}^{2 -}

would act as hole traps and might appear near the valence band edge. [ 48 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Manju

Jain

Savita

et al. 2021

Physica Status Solidi (a)

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“…Figure 7(c) shows the QE corrected wavelength resolved TL glow curve emission spectrum. The wellresolved two distinct TL emission peaks have been observed at 571 nm and 480 nm corresponding to the characteristic emissions of Dy 3+ ions for two main f-f transitions: 4 F 9/2-6 H 13/2 (573 nm, yellow) and 4 F 9/2-6 H 15/2 (482 nm, blue) transitions [19]. The typical TL glow curve recorded for 480 nm fixed monochromator wavelength with a linear temperature profile and hearing rate (HR) of 5 K s −1 for 340 °C maximum temperatures.…”

Section: D Tl Emission Spectrum Of Caso 4 :Dymentioning

confidence: 95%

“…The wavelength resolved isothermal TL emission of Teflon embedded CaSO 4 :Dy has been recorded for 190 °C constant temperature. The CaSO 4 :Dy phosphor is known to have multiple TL peaks at lower temperature than dominating dosimetric 220 °C TL glow peak [19]. These low temperature peaks (60 °C and 110 °C) were found to disappear in 24 h after irradiation.…”

Section: D Tl Emission Spectrum Of Caso 4 :Dymentioning

confidence: 99%

Development of wavelength-resolved 3D-inegrated TL and OSL reader system

Mishra¹,

Pal²,

Bhowmick³

et al. 2021

Eng. Res. Express

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A new wavelength-resolved thermo luminescence (TL) cum optically stimulated luminescence (OSL) reader system has been designed and developed. This reader system uses the compact Seya-Namioka optical layout based monochromator, PMT, and resistive heating method to acquire TL glow curve emissions spectrum. The phosphor samples heated from room temperature to 400 °C, either linearly with a programmable heating rate of 0.01 to 30 K s −1 or alternative constant step temperature profiles. The TL glow curve emission spectrum has been resolved by rotating the grating attached to a monochromator covering the wavelength from 200 to 900 nm. The wavelength scanning is linear with respect to time and the scan rate can be selected from 0.1 to 8 n m s −1 . A broad spectral response of the PMT detection module has been used to record the emitted TL spectrum. The blue (465 nm) reference LED light source is provided for a spectrum calibration of the monochromator. The isometric 3D TL emission spectra of LiCaAlF 6 :Eu,Y, α-Al 2 O 3 :C, and CaSO 4 :Dy have been successfully recorded using this reader system. In order to record the OSL emission spectrum, 470 nm blue LEDs have been provided as a separate stimulation module.

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“…Rare earth (RE)‐doped crystalline solids are known to be interesting TL materials that can be used for radiation dosimetry. Particularly T m and Dy doped in CaSO 4 show a high sensitivity over a wide range of radiation frequencies ranging from γ‐rays to ultraviolet (UV) radiation . Since, the development of CaSO 4 doped with different rare earths as described by Yamashita et al, this approach has taken a significant lead in personal and environmental radiation monitoring using TL dosimetry and with these materials as sensing elements .…”

Section: Introductionmentioning

confidence: 99%

Luminescence characterization of Dy and Eu doped Na₆Mg(SO₄)₄ phosphors

et al. 2016

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A series of single-phase phosphors based on Na Mg(SO ) (Z = 11.70) doped with Dy and Eu was prepared by the wet chemical method. The photoluminescence (PL) and thermoluminescence (TL) properties of Dy - and Eu -activated Na Mg(SO ) phosphors were investigated. The characteristic emissions of Dy and Eu were observed in the Na Mg(SO ) host. The TL glow curve of the Na Mg(SO ) :Dy phosphor consisted of a prominent peak at 234°C and a very small hump at 158°C. The TL sensitivity of the Na Mg(SO ) :Dy phosphor was found to be four times less than the commercialized CaSO :Dy phosphor. The TL dose-response of the Na Mg(SO ) :Dy phosphor was studied from a dose range of 5-10 kGy and the linear dose-response was observed up to 1 kGy which is good for a microcrystalline phosphor. Trapping parameters for both the samples were calculated using the Initial Rise and Chen's peak shape methods.

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Effect of anion interstitials on the thermoluminescent properties of CaSO4:Dy

Cited by 13 publications

References 8 publications

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Development of wavelength-resolved 3D-inegrated TL and OSL reader system

Luminescence characterization of Dy and Eu doped Na₆Mg(SO₄)₄ phosphors

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Effect of anion interstitials on the thermoluminescent properties of CaSO4:Dy

Cited by 13 publications

References 8 publications

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO2:Dy Nanophosphors

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO2:Dy Nanophosphors

Development of wavelength-resolved 3D-inegrated TL and OSL reader system

Luminescence characterization of Dy and Eu doped Na6Mg(SO4)4 phosphors

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Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO₂:Dy Nanophosphors

Luminescence characterization of Dy and Eu doped Na₆Mg(SO₄)₄ phosphors