Synthesis and luminescence properties of Tb3+-doped LiMgPO4 phosphor

Palan, C. B.; Bajaj, N. S.; Soni, Anuj; Omanwar, S. K.

doi:10.1007/s12034-016-1261-4

Cited by 32 publications

(6 citation statements)

References 18 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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“…The phosphors LiSr 4 (BO 3 ) 3 doped with Pr 3+ , Gd 3+ and Gd 3+ -Pr 3+ were prepared by a modified solid-state diffusion method. Palan et al [12,13] and Bajaj et al [14] )3 ) (99.99% purity) were used for preparation of phosphors. Stoichiometric amounts of starting materials with a little amount of double distilled water were mixed thoroughly in a china basin to obtain a homogeneous solution.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and photoluminescence study of narrow-band UVB-emitting LiSr4(BO3)3:Gd3+, Pr3+ phosphor

Chauhan

Bajaj²,

Omanwar

2017

Bull Mater Sci

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A series of Pr 3+ , Gd 3+ and Pr 3+-Gd 3+-doped inorganic borate phosphors LiSr 4 (BO 3) 3 were successfully synthesized by a modified solid-state diffusion method. The crystal structures and the phase purities of samples were characterized by powder X-ray diffraction. Surface morphology of the sample was studied by scanning electronic microscopy (SEM). The optimal concentrations of dopant Gd 3+ ions in compound LiSr 4 (BO 3) 3 were determined through the measurements of photoluminescence (PL) spectra of phosphors. Gd 3+-doped phosphors LiSr 4 (BO 3) 3 show strong band absorption in UV spectral region and narrow-band UVB emission under the excitation of 276 nm was only due to 6 P J → 8 S 7/2 transition of Gd 3+ ions. The effect of Pr 3+ ion on excitation of LiSr 4 (BO 3) 3 :Gd 3+ was also studied. The excitation of LiSr 4 (BO 3) 3 :Gd 3+ , Pr 3+ gives a broad-band spectra, which show very good overlap with the Hg 253.7 nm line. The photoluminescence spectra of LiSr 4 (BO 3) 3 with different doping concentrations Pr 3+ and keeping the concentration of Gd 3+ constant at 0.03 mol have also been studied. The emission intensity of LiSr 4 (BO 3) 3 :Pr 3+-Gd 3+ phosphors increases with increasing Pr 3+ doping concentration and reaches a maximum at 0.01 mol. From the photoluminescence study of LiSr 4 (BO 3) 3 :Gd 3+ , Pr 3+ we conclude that there was efficient energy transfer from Pr 3+ → Gd 3+ ions in LiSr 4−x−y Pr x Gd y (BO 3) 3 phosphors.

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“…The LMP compound was shown to have a high radiosensitivity and a broad linear dose–response range [ 3 ]. Numerous research articles on luminescent properties of LMP doped with different elements have been published since 2010 [ 3 , 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 , 30 , 31 ]. The LMP crystal codoped with terbium (Tb) and boron (B) has been most extensively studied, but other rare earth dopants such as Sm, Tm, and Eu have also been tested [ 5 , 10 , 13 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Uniformity of Thermoluminescence and Optically Stimulated Luminescence Signals Over the Length of Doped LiMgPO4 Crystal Rods Grown by Micro-Pulling-Down Method

et al. 2020

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The purpose of this work was to systematically assess the distribution of thermoluminescence (TL) and optically stimulated luminescence (OSL) properties along the length of crystals grown by the micro-pulling-down method, in relation to the microstructure and distribution of activators. We analyzed lithium magnesium phosphate (LiMgPO4; LMP) crystals doped with terbium (Tb; 0.8 mol%) or with a combination of thulium (Tm; 0.8 mol% or 1.2 mol%) and boron (B; 10 mol%). Crystals of several centimeters in length and 3 mm in diameter were cut into 20–40 slices, depending on length. For each sample, TL glow curves and OSL decay curves were examined. Optical microscopy and scanning electron microscopy were used to assess the microstructure and elemental composition of several selected samples. Two-dimensional TL readouts were performed to identify the areas with higher and lower signal emission. Our study showed that there may be significant differences not only in LMP sensitivity along the crystal’s axis but also on the surface of the slice. The distribution of activators varies depending on the type of crystals and strongly affects luminescence properties.

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Synthesis and luminescence properties of Tb3+-doped LiMgPO4 phosphor

Cited by 32 publications

References 18 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 photoluminescence study of narrow-band UVB-emitting LiSr4(BO3)3:Gd3+, Pr3+ phosphor

Uniformity of Thermoluminescence and Optically Stimulated Luminescence Signals Over the Length of Doped LiMgPO4 Crystal Rods Grown by Micro-Pulling-Down Method

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