LiMgPO4:Tb,B OSL phosphor – CW and LM OSL studies

Kumar, Munish; Dhabekar, Bhushan; Menon, S.N.; Chougaonkar, M.P.; Mayya, Y. S.

doi:10.1016/j.nimb.2011.05.010

Cited by 49 publications

(11 citation statements)

References 15 publications

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“…Since 2010, almost 30 research papers on luminescent properties of differently doped LMP, as a good candidate for application in ionizing radiation dosimetry, have been published [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. Among them, the Tb and B co-doped LMP is most extensively studied [6,7,8,9,11,12,16,17,19,24,26,27,28], however, the other rare-earths dopants, like e.g., Eu [5,13,15,29], Sm [10,15], Tm [23,29], Er [29], and Y [29], were also considered and investigated. In most cases, the samples in form of the powders or cold-pressed and sintered pellets (mixed with polytetrafluoroethylene, PTFE) have been studied, but also the LMP crystals were successfully grown from the melt by micro-pulling-down method [4,18,21,22,29].…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

et al. 2019

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We investigated the influence of terbium and thulium trivalent rare-earth (RE) ions co-doping on the luminescent properties enhancement of LiMgPO4 (LMP) crystal host. The studied crystals were grown from the melt by micro-pulling-down (MPD) technique. Luminescent properties of the obtained crystals were investigated by thermoluminescence (TL) method. The most favorable properties and the highest luminescence enhancement were measured for Tb and Tm double doped crystals. A similar luminescence level can be also obtained for Tm, B co-doped samples. In this case, however, the low-temperature TL components have a significant contribution. The measured luminescent spectra showed a typical emission of Tb3+ and Tm3+ ions of an opposite trapping nature, namely the holes and electron-trapping sites, respectively. The most prominent transitions of 5D4 → 7F3 (550 nm for Tb3+) and 1D2 → 3F4 (450 nm for Tm3+) were observed. It was also found that Tb3+ and Tm3+ emissions show temperature dependence in the case of double doped LMP crystal sample, which was not visible in the case of the samples doped with a single RE dopant. At a low temperature range (up to around 290 °C) Tm3+ emission was dominant. At higher temperatures, the electrons occupying Tm3+ sites started to be released giving rise to emissions from Tb-related recombination centers, and emissions from Tm3+ centers simultaneously decreased. At the highest temperatures, emission took place from Tb3+ recombination centers, but only from deeper 5D4 level-related traps which had not been emptied at a lower temperature range.

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Section: Introductionmentioning

confidence: 99%

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

et al. 2019

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“…Three LM-OSL components were recognized in the OSL curve similar to component present in CW-OSL mode. Kumar et al [16] reported criteria for first order kinetics. The calculated kinetic parameters were given in table 3.…”

Section: 3c Linear Modulation Osl (Lm-osl)mentioning

confidence: 99%

Synthesis and luminescence properties of Tb3+-doped LiMgPO4 phosphor

Palan

Bajaj²,

Soni

et al. 2016

Bull Mater Sci

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Polycrystalline sample LiMg (1−x) PO 4 :xTb 3+ (x = 0.001, 0.002, 0.005, 0.01, 0.02) phosphor was synthesized via modified solid state method (MSSM). The prepared sample was characterized through XRD pattern (X-ray diffraction) and SEM (scanning electron microscope). Additionally, photoluminescence (PL), optically stimulated luminescence (OSL), thermoluminescence (TL) and other dosimetric properties including dose linearity, reusability and fading were studied. In OSL mode, sensitivity of prepared phosphor was found to be 2.7 times that of LiMgPO 4 :Tb 3+ , B (BARC) phosphor and 4.3 times that of α-Al 2 O 3 :C (BARC) phosphor. The TL glow consists of overlapping peaks in temperature range of 50-400 • C and first peak (P 1) was observed at 150 • C, second peak (P 2) at 238 • C, third peak (P 3) at 291 • C and fourth peak (P 4) at 356 • C. The TL sensitivity of second peak (P 2) of LiMgPO 4 :Tb 3+ phosphor was compared with α-Al 2 O 3 :C (BARC) phosphor and found to be 100 times that of the α-Al 2 O 3 :C (BARC) phosphor. The minimum detectable dose (MDD) was found to be 5.6 μGy. Moreover, photoionization cross-sections, linearity, reusability, fading and kinetic parameters were calculated. Also, photoluminescence spectra of LiMgPO 4 :Tb 3+ shows characteristic green-yellow emission exciting at 224 nm UV source.

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“…Although the olivine-type compound's crystal structure has been investigated since 1982 [6], the first research report on the luminescence characteristics of this material is probably dated to 2010 [7]. Since then, a large number of scientific papers devoted to luminescence investigations of this material have been published [8][9][10][11][12][13]. In most cases, samples in the form of powder [9], cold-pressed and sintered pellets [8], or fluoropolymer foils [13] have been studied.…”

Section: Introductionmentioning

confidence: 99%

“…Since then, a large number of scientific papers devoted to luminescence investigations of this material have been published [8][9][10][11][12][13]. In most cases, samples in the form of powder [9], cold-pressed and sintered pellets [8], or fluoropolymer foils [13] have been studied. Recently, this material was also successfully crystallized from melt using a novel micro-pulling-down (MPD) crystal growth technique [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic and Dopant-Related Luminescence of Undoped and Tb Plus Tm Double-Doped Lithium Magnesium Phosphate (LiMgPO4, LMP) Crystals

et al. 2020

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In this work, the luminescence properties of undoped, Tm3+ doped, and Tb3+ plus Tm3+ double-doped crystals of the lithium magnesium phosphate (LiMgPO4, LMP) compound were investigated. The crystals under study were grown from melt using the micro-pulling-down method. The intrinsic and dopant-related luminescence of these crystals were studied using cathodo-, radio-, photo-, and thermoluminescence methods. Double doping with Tb3+ and Tm3+ ions was analyzed as these dopants are expected to exhibit an opposite trapping nature, namely to create the hole and electron-trapping sites, respectively. The spectra measured for the undoped samples revealed three prominent broad emission bands with maxima at around 3.50, 2.48, and 1.95 eV, which were associated with intrinsic structural defects within the studied compound. These were expected due to the anion vacancies forming F+-like centers while trapping the electrons. The spectra measured for Tb and Tm double-doped crystals showed characteristic peaks corresponding to the 4f–4f transitions of these dopants. A simplified model of a recombination mechanism was proposed to explain the temperature dependence of the measured thermally stimulated luminescence spectra. It seems that at low temperatures (below 300 °C), the charge carriers were released from 5D3-related Tb3+ trapping sites and recombination took place at Tm-related sites, giving rise to the characteristic emission of Tm3+ ions. At higher temperatures, above 300 °C, the electrons occupying the Tm3+-related trapping sites started to be released, and recombination took place at 5D4-related Tb3+ recombination centers, giving rise to the characteristic emission of Tb3+ ions. The model explains the temperature dependence observed for the luminescence emission from double-doped LiMgPO4 crystals and may be fully applicable for the consideration of emissions of other double-doped compounds.

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LiMgPO4:Tb,B OSL phosphor – CW and LM OSL studies

Cited by 49 publications

References 15 publications

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

Synthesis and luminescence properties of Tb3+-doped LiMgPO4 phosphor

Intrinsic and Dopant-Related Luminescence of Undoped and Tb Plus Tm Double-Doped Lithium Magnesium Phosphate (LiMgPO4, LMP) Crystals

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