Luminescence in LiCaAlF6:Eu,La phosphor

Rahangdale, S. R.; Palikundwar, U. A.; Wankhede, S. P.; Dhabekar, Bhushan; Kadam, Sonal; Moharil, S. V.

doi:10.1016/j.jlumin.2016.06.038

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…It implies that Ce 3+ ions can introduce extrinsic defects and diminish intrinsic defects. Theoretically, the Ce 3+ ions replace the Ca 2+ host lattice . Due to the charge compensation effect, Li vacancies are apt to be formed, and the most possible extrinsic defect is calculated to be the Ce Ca2+ 3+ V Li – complex .…”

Section: Resultsmentioning

confidence: 99%

LiCaAlF₆:Eu and LiCaAlF₆:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

Yang

Loyd

Shi

et al. 2021

Crystal Growth & Design

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Single crystals of LiCaAlF6:Eu and LiCaAlF6:Ce with a diameter of 25.4 mm were grown by the Bridgman method in a nonvacuum atmosphere. The as-grown crystals are highly transparent and crack- and inclusion-free. The X-ray diffraction pattern confirmed a single phase of a trigonal structure with the space group of P3̅1c. The effects of a nonvacuum growth atmosphere on optical and scintillation properties and defect structures were studied. The 4f-5d absorption bands of Eu2+ and Ce3+ in the LiCaAlF6 host peak at 300 and 270 nm, respectively. The results of the photoluminescence spectrum and X-ray excited radioluminescence demonstrate that Eu2+ ions dominantly exist in the LiCaAlF6:Eu single crystal with a small amount of Eu3+ ions. Under γ-ray radiation, single crystals of LiCaAlF6:Eu and LiCaAlF6:Ce have light yields of 23,000 ± 2000 and 1000 ± 100 photons/MeV, respectively. Single scintillation decay components of 1.64 μs and 45 ns are evaluated for LiCaAlF6:Eu and LiCaAlF6:Ce, respectively. The defect structures were investigated by using three-dimensional thermoluminescence measurement.

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Section: Resultsmentioning

confidence: 99%

LiCaAlF₆:Eu and LiCaAlF₆:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

Yang

Loyd

Shi

et al. 2021

Crystal Growth & Design

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“…= 14.05) is about 20 times higher than that of Al 2 O 3 :C (Z eff. = 11.28) . Figure (a−c) presents the dose−response calibration curves of OSLDs at three X‐ray energies (60, 70 and 81 kV).…”

Section: Resultsmentioning

confidence: 99%

“…Three different OSL phosphors, developed by Bhabha Atomic Research Centre (BARC), namely aluminium oxide doped with carbon (Al 2 O 3 :C), lithium magnesium phosphate doped with terbium and boron (LiMgPO 4 :Tb,B) and lithium calcium aluminium fluoride doped with europium and yttrium (LiCaAlF 6 :Eu,Y) were used in the study. Methods of preparations of these OSL phosphors are available elsewhere . These OSL phosphors were reported to be highly sensitive with minimum detectable dose of the order of a few 10s of μGy.…”

Section: Methodsmentioning

confidence: 99%

Radiation dose measurements in a dental orthopantogram unit using indigenously developed optically stimulated luminescence dosimeters

Kumar

Sharma

Chandola³

et al. 2019

Luminescence

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Dental orthopantogram (OPG)/cone beam computed tomography (CBCT) scanners are gaining popularity due to their 3D imaging with multiplanar view that provides clinical benefits over conventional dental radiography systems. Dental OPG/CBCT provides optimal visualization of adjacent overlaying anatomical structures that will be superpositioned in any single projection. The characteristics of indigenously developed optically stimulated luminescence dosimeters, namely, aluminium oxide doped with carbon (Al 2 O 3 :C), lithium magnesium phosphate doped with terbium and boron (LiMgPO 4 :Tb,B) and lithium calcium aluminium fluoride doped with europium and yttrium (LiCaAlF 6 :Eu,Y) were evaluated for their use in dental dosimetry. The dose −response of these dosimeters was studied at X-ray energies 60 kV, 70 kV and 81 kV. Radiation doses were also measured using Gafchromic film for comparison.Radiation dose was measured at eight different locations of a polymethyl methacrylate (PMMA) head phantom including eyes. The optically stimulated luminescence (OSL) sensitivity of LiMgPO 4 :Tb,B is about 1.5 times and LiCaAlF 6 :Eu, is about 20 times higher than the sensitivity of Al 2 O 3 :C. It was found that measured radiation doses by the three optically stimulated luminescence dosimeters (OSLDs) andGafchromic film in the occipital region (back side) of a PMMA phantom, were consistent but variations in dose at other locations were significantly higher. The three OSLDs used in this study were found to be suitable for radiation dose measurement in dental units.

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“…Synthesis techniques for these OSL phosphors have been published previously. [6][7][8][9][10] These three OSL phosphors prepared at BARC were reported to be highly sensitive and capable of detecting very low doses in the order of microGray (μGy). The fading characteristics reported for these OSL phosphors were: (i) 5% in the first 5-15 min following irradiation and after that fading was negligible for Al 2 O 3 :C [11,12] ; (ii) 15% in first 10 days following irradiation, after that the fading was negligible for LiMgPO 4 :B [13] ; and (iii) 7% in about 9 days following irradiation and after that fading was negligible for LiCaAlF 6 :Eu,Y.…”

Section: Introductionmentioning

confidence: 99%

Relative energy response of indigenously developed optically stimulated luminescence dosimeters Al₂O₃:C, LiMgPO₄:B and LiCaAlF₆:Eu,Y in therapeutic photon and electron beams

et al. 2020

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The relative energy responses of three indigenously developed optically stimulated luminescence (OSL) phosphors in the disc form were studied in therapeutic photon and electron beams. Calibration in terms of absorbed dose was carried out in the dose range 5–500 cGy in 60Co gamma rays, high energy X‐rays, and electron beams used in radiotherapy. The combined standard uncertainty in the estimation of absorbed dose using these OSL discs (OSLDs) was 3.3%. Dose–response curves of these OSLDs in 60Co gamma rays, 6 and 10 MV (flat and unflat), 15 MV and 6 and 15 MeV electron beams were found to be linear. Furthermore, these OSLDs exhibited a relative energy‐dependent response for both photon and electron beams. The relative energy response correction factor for photon and electron beams were in the range 1.01–1.05 and 1.03–1.06, respectively.

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Luminescence in LiCaAlF6:Eu,La phosphor

Cited by 11 publications

References 32 publications

LiCaAlF₆:Eu and LiCaAlF₆:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

LiCaAlF₆:Eu and LiCaAlF₆:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

Radiation dose measurements in a dental orthopantogram unit using indigenously developed optically stimulated luminescence dosimeters

Relative energy response of indigenously developed optically stimulated luminescence dosimeters Al₂O₃:C, LiMgPO₄:B and LiCaAlF₆:Eu,Y in therapeutic photon and electron beams

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Luminescence in LiCaAlF6:Eu,La phosphor

Cited by 11 publications

References 32 publications

LiCaAlF6:Eu and LiCaAlF6:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

LiCaAlF6:Eu and LiCaAlF6:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

Radiation dose measurements in a dental orthopantogram unit using indigenously developed optically stimulated luminescence dosimeters

Relative energy response of indigenously developed optically stimulated luminescence dosimeters Al2O3:C, LiMgPO4:B and LiCaAlF6:Eu,Y in therapeutic photon and electron beams

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LiCaAlF₆:Eu and LiCaAlF₆:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

LiCaAlF₆:Eu and LiCaAlF₆:Ce Single Crystals Grown by the Vertical Bridgman Method in a Nonvacuum Atmosphere and Their Optical and Scintillation Properties

Relative energy response of indigenously developed optically stimulated luminescence dosimeters Al₂O₃:C, LiMgPO₄:B and LiCaAlF₆:Eu,Y in therapeutic photon and electron beams