Theoretical and experimental evidences of defects in LiMgPO4

Келлерман, Д. Г.; Medvedeva, N. I.; Kalinkin, M. O.; Syurdo, A. I.; Зубков, В. Г.

doi:10.1016/j.jallcom.2018.06.328

Cited by 34 publications

(12 citation statements)

References 61 publications

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“…This confirmed the correspondence of 260 and 290 nm excitation bands to the same emission centers. It should be noted here that the PL spectra obtained in this work were in good agreement with results presented in Kellerman et al [20] for cold-pressed and sintered LMP pellets regarding both the shape of the spectra and the observed characteristics. corresponded to the maxima in the excitation spectra in (B).…”

Section: Pl Spectra and Decay Kinetics Analysis For The Undoped Lmp Csupporting

confidence: 91%

“…All excitation spectra measured at RT showed an intense band with a long-wavelength edge at around 214 nm. This value agrees very well with the long-wavelength edge of fundamental absorption [20]. The excitation spectra, measured at emission wavelengths of 365, 497, and 632 nm, exhibited weak excitation bands at around 260 and 295 nm.…”

Section: Pl Spectra and Decay Kinetics Analysis For The Undoped Lmp Csupporting

confidence: 85%

“…The dopant concentrations were 0.2 and 0.6 mol% for Tb and Tm ions, respectively. The more detailed description of LMP powder preparation using the solid-state reaction can be found elsewhere [17,18,20].…”

Section: Materials Preparationmentioning

confidence: 99%

“…Although the luminescent properties of this relatively new and promising phosphor have been of interest to several research groups for almost a decade, there is still only very limited knowledge on the luminescence mechanisms, especially in the case of nominally pure samples of the material. There are probably only two research papers available that are devoted to the intrinsic-defect-related luminescence in LMP cold-pressed and sintered pellets [20,21]. However, in the case of crystals, the situation may look slightly different.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Pl Spectra and Decay Kinetics Analysis For The Undoped Lmp Csupporting

confidence: 91%

Section: Pl Spectra and Decay Kinetics Analysis For The Undoped Lmp Csupporting

confidence: 85%

Section: Materials Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…A lot of attention is now payed for lithium magnesium phosphate (LiMgPO 4 , LMP) compound, as it shows a high radio-sensitivity and a broad linear dose-response range [4]. 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.…”

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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Blue LED‐Pumped Broadband Short‐Wave Infrared Emitter Based on LiMgPO₄:Cr³⁺,Ni²⁺ Phosphor

Miao

Liang

Zhang

et al. 2022

Adv Materials Technologies

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Blue light‐emitting diode (LED) pumped short‐wave infrared (SWIR; 900–1700 nm) emitters are providing new solutions in the design of portable and cost‐effective infrared light sources for medical, surveillance, and spectroscopy applications by taking advantage of converter technology. However, desirable blue‐light‐excitable SWIR‐emitting phosphors with a peak wavelength longer than 1000 nm are lacking. Herein, a promising broadband SWIR phosphor is designed and developed by incorporating Cr3+‐Ni2+ ion pairs into LiMgPO4 host. Upon 450 nm blue light excitation, the as‐synthesized LiMgPO4:Cr3+,Ni2+ phosphor exhibits a broad and intense SWIR emission spanning from 1100–1600 nm with peak wavelength at 1380 nm and a full width at half maximum of 273 nm due to the efficient energy transfer from Cr3+ to Ni2+. Moreover, phosphor‐converted SWIR LED prototype device based on the combination of 450 nm blue LED chip and the optimized phosphor is fabricated as a new type of broadband illuminator covering the SWIR waveband, delivering a maximum radiant power of ≈2.7 mW at 120 mA driving current. Benefiting from the distinct spectral characteristics of SWIR light, the practical relevance of the fabricated SWIR illuminator is demonstrated in covert information identification and night vision lighting.

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Theoretical and experimental evidences of defects in LiMgPO4

Cited by 34 publications

References 61 publications

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

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

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

Blue LED‐Pumped Broadband Short‐Wave Infrared Emitter Based on LiMgPO₄:Cr³⁺,Ni²⁺ Phosphor

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Theoretical and experimental evidences of defects in LiMgPO4

Cited by 34 publications

References 61 publications

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

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

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

Blue LED‐Pumped Broadband Short‐Wave Infrared Emitter Based on LiMgPO4:Cr3+,Ni2+ Phosphor

Contact Info

Product

Resources

About

Blue LED‐Pumped Broadband Short‐Wave Infrared Emitter Based on LiMgPO₄:Cr³⁺,Ni²⁺ Phosphor