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Open AccessArticle

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

1
Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL31342 Krakow, Poland
2
AGH University of Science and Technology, Mickiewicza 30, PL30059 Krakow, Poland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2861; https://doi.org/10.3390/ma12182861
Received: 22 August 2019 / Revised: 31 August 2019 / Accepted: 3 September 2019 / Published: 5 September 2019
(This article belongs to the Special Issue Advanced Technology for Materials Synthesis and Processing)
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 5D47F3 (550 nm for Tb3+) and 1D23F4 (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. View Full-Text
Keywords: LiMgPO4; LMP; lithium magnesium phosphate; trivalent rare-earth ions; terbium; thulium; luminescence properties; luminescent enhancement; thermoluminescence LiMgPO4; LMP; lithium magnesium phosphate; trivalent rare-earth ions; terbium; thulium; luminescence properties; luminescent enhancement; thermoluminescence
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Gieszczyk, W.; Marczewska, B.; Kłosowski, M.; Mrozik, A.; Bilski, P.; Sas-Bieniarz, A.; Goj, P.; Stoch, P. Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping. Materials 2019, 12, 2861.

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