Synthesis and characterization of novel Na15(SO4)5F4Cl:Ce3+halosulfate phosphors

Bhake, A. M.; Nair, Govind B.; Zade, G. D.

doi:10.1002/bio.3131

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…The glow curve shows two peaks, a prominent peak at 148°C and another at 255°C compared with the TL glow curve for γ‐ray‐exposed samples that showed single peak at 160°C. Heavy carbon ions lost their whole energy after penetrating the phosphor, this action perturbed the normal lattice site and therefore altered the trapping mechanism and resulted in the generation of new trap centres that caused the peak at 255°C. The present phosphor showed a maximum TL intensity at 0.7 mol% of Dy when exposed to the C 5+ ion beam fluence 1 × 10 11 ions/cm 2 .…”

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%

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

Yerpude

Chopra²,

Dhoble³

et al. 2019

Luminescence

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“…Na 2 ZnP 2 O 7 has been prepared as a host material for activator ions such as for a green phosphor (Na 2 ZnP 2 O 7 :Cr 3+ ), [ 20 ] reddish‐orange phosphors (Na 2 ZnP 2 O 7 :Eu 3+ ), [ 21 ] red phosphors (Na 2 ZnP 2 O 7 :Mn 2+ ) [ 22 ] and a near UV‐violet phosphor (Na 2 ZnP 2 O 7 :Ce 3+ ). [ 23 ] But, to the best of our knowledge, there has been no report in the literature dealing with the luminescence properties of a Tb 3+ ion‐doped Na 2 ZnP 2 O 7 phosphor.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescence spectroscopy study of a novel orange‐red colour emissions phosphor based on Tb³⁺ ion‐doped Na₂ZnP₂O₇

et al. 2021

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Here, we report the synthesis and study of new orange‐red (OR) colour‐emitting phosphors Na2ZnP2O7:xTb3+ (x = 1, 1.25, 1.5, and 1.75 mol%) using a conventional solid‐state reaction. The sample crystallographic structures and their room temperature photoluminescence properties were measured using X‐ray powder diffraction, excitation and emission spectra, as well as emission decay curves. X‐ray diffraction analysis showed an isostructural tetragonal structure for all the doped materials with no impurities. Several colour emissions corresponding to 5D4→7F6 (blue), 5D4→7F5 (green), 5D4→7F4 (orange) and 5D4→7F3,2,0 (red) intraconfigurational transitions were observed and investigated. These colours were dominated by the OR colours. 5D4 energy level lifetime was independent of Tb3+ concentration. Various radiative and luminescence parameters, such as experimental branching ratio, radiative decay rate, and luminescence quantum efficiencies, were calculated and discussed. Chromaticity diagram calculations illustrated an orange emission for all the studied materials.

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Solid state diffusion and amalgamating anionic exchange at a KNaSO₄ phosphors activated with Eu³⁺, Dy³⁺ and Sm³⁺ rare earth ions to enhance w‐LED performance

Duragkar¹,

Dhoble²,

Kohale

et al. 2021

Luminescence

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In present work, KNa(SO4) phosphors doped with different concentrations of rare earth Eu3+, Sm3+ and Dy3+ ions (0.05, 0.1, 0.3, 0.5, 0.7, 1 mol%) were synthesized using a solid‐state diffusion technique. Photoluminescence (PL) investigations were carried out for the whole range of Eu3+, Sm3+ and Dy3+‐doped phosphors; rare earth ions that retained maximum PL intensity were selected for advanced anionic exchange. In the present investigation, phosphors KNa(SO4):Eu3+ (1 mol%), KNa(SO4):Dy3 + (0.5 mol%) and KNa(SO4):Sm3+ (0.3 mol%) had the highest PL intensity, and were therefore selected for further anionic substitution of sulphate anions with different concentrations of vanadate, phosphate, and tungstate anions, such as KNa(SO4)1‐x(MO4)x: W (where W = Eu3+ 1 mol%, Dy3+0.5 mol% and Sm3+ 0.3 mol%; MO4 = PO4, VO4, WO4; and x = 0.1, 0.3, 0.5, 0.7, 1). Structural and molecular environments of the substituted phosphors were characterized individually using X‐ray diffraction and Fourier transform infrared spectroscopy. In‐depth morphological investigations of the prepared phosphors were undertaken using scanning electron microscopy. For the principal investigation on enhancement of white light‐emitting diode (w‐LED) performance, the PL properties of all the synthesized phosphors were studied analytically. Emission intensity ratios for KNa(SO4):Eu3+ 1 mol%, KNa(SO4)0(PO4)1:Eu 1 mol%, KNa(SO4)0.9(VO4)1:Eu 1 mol%, and KNa(SO4)0.9(WO4)0.1:Eu 1 mol% were 1:1.15:1.23:0.08. PL intensity ratios for the phosphors KNaSO4:Dy 0.5 mol% and KNa(SO4)0.9(PO4)0.1:Dy 0.5 mol% was 1:2. The ratio of PL intensity was 1:3.2:0.8 for KNa(SO4):Sm 1 mol%, KNa(SO4)0.5(PO4)0.5:Sm 0.3 mol%, and KNa(SO4)0.7(VO4)0.3:Sm 0.3 mol% phosphors, respectively. Chromaticity investigations were carried out using Commission Internationale de l'Éclairage colour co‐ordinate diagrams, which suggested that the prepared Eu3+‐doped and Sm3+‐doped phosphors would be prospective candidates for red and green LEDs, respectively, whereas Dy3+‐doped phosphors showed emission in the blue and yellow regions. The entire study indicated that amalgamation of anionic exchange at a KNaSO4 phosphor activated with Eu3+, Dy3+ and Sm3+ rare earth ions could generate and enhance white light emission.

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Synthesis and characterization of novel Na₁₅(SO₄)₅F₄Cl:Ce³⁺halosulfate phosphors

Cited by 6 publications

References 31 publications

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

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

Synthesis and luminescence spectroscopy study of a novel orange‐red colour emissions phosphor based on Tb³⁺ ion‐doped Na₂ZnP₂O₇

Solid state diffusion and amalgamating anionic exchange at a KNaSO₄ phosphors activated with Eu³⁺, Dy³⁺ and Sm³⁺ rare earth ions to enhance w‐LED performance

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Synthesis and characterization of novel Na15(SO4)5F4Cl:Ce3+halosulfate phosphors

Cited by 6 publications

References 31 publications

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

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

Synthesis and luminescence spectroscopy study of a novel orange‐red colour emissions phosphor based on Tb3+ ion‐doped Na2ZnP2O7

Solid state diffusion and amalgamating anionic exchange at a KNaSO4 phosphors activated with Eu3+, Dy3+ and Sm3+ rare earth ions to enhance w‐LED performance

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Synthesis and characterization of novel Na₁₅(SO₄)₅F₄Cl:Ce³⁺halosulfate phosphors

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

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

Synthesis and luminescence spectroscopy study of a novel orange‐red colour emissions phosphor based on Tb³⁺ ion‐doped Na₂ZnP₂O₇

Solid state diffusion and amalgamating anionic exchange at a KNaSO₄ phosphors activated with Eu³⁺, Dy³⁺ and Sm³⁺ rare earth ions to enhance w‐LED performance