Fading studies in LiMgPO4:Tb,B and synthesis of new LiMgPO4 based phosphor with better fading characteristics

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

“…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].…”

“…Namely, the low-temperature luminescent signal (<150 °C), which dominates the glow-curves measured for powder samples, is not observed (or is strongly reduced) in crystal samples (further proved in this work). This low-temperature luminescence originates from the electrons captured by the shallow electron traps and may have a significant impact to a strong fading observed for this material [26]. The absence of this low-temperature component suggests that high-temperature crystallization (close to the melting point – 1025 °C) dramatically changes the energetic distribution of TL-related structure defects in this material and may lead to the improvement of its dosimetric 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

“…[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. [10] Considering the fading characteristics of these OSL phosphors, we followed a fixed protocol of reading out the irradiated discs after 10 days.…”

Dosimetric and spectroscopic study of LiMgPO4 doped with Tm3+ and Er3+

“…The dynamics of LMP in the form of powder, 30-34 crystals [35][36][37][38][39] and a thin foil was studied. 40,41 To further explore the TL and OSL properties of LMP, the luminescence kinetic parameters of undoped crystals were extensively studied. 42 Considerable research [43][44][45][46][47] has also been conducted on defects in prepared and irradiated lithium magnesium phosphate.…”