Optimization of the dopant concentration in synthesized Al2O3 phosphor

Bharthasaradhi, R.; Nehru, L.C.; Chopra, Vibha; Dhoble, S.J.

doi:10.1007/s10854-018-9209-7

Cited by 2 publications

(1 citation statement)

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“…The decrease in TL intensity might have arisen due to concentration quenching of Dy 3+ ions. With increase in dopant concentration, the distance between the dopant ions decreased, therefore energy levels of dopant ions perturbed each other to quench each other's emission and causing a decrease in the TL intensity. In the present study, a 0.1 mol% concentration of Dy 3+ was found to be the best concentration for studying the TL properties, so this was used for further characterization.…”

Section: Resultsmentioning

confidence: 99%

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

Yerpude

Chopra²,

Dhoble³

et al. 2019

Luminescence

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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] .

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Section: Resultsmentioning

confidence: 99%