Luminescent properties of Tb and Eu activated AxB1-xAlO3 (A = Y, Lu, Gd; B = Lu; x = 0, 0.5, 1) mixed oxides crystals prepared by micro-pulling-down method

Gieszczyk, W.; Bilski, P.; Kłosowski, M.; Mrozik, Anna; Zorenko, T.; Witkiewicz, Sandra; Zorenko, Yu.

doi:10.1016/j.radmeas.2019.106140

Cited by 9 publications

(8 citation statements)

References 19 publications

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“…The ground state energy location of Tm 2+ ions is below the bottom of conduction band, thus Tm 3+ ions may act as the electron traps [41]. A similar behavior was recently described for Tb 3+ and Eu 3+ (also considered as holes and electrons traps, respectively) ions doped mixed oxides crystals [42].…”

Section: Resultsmentioning

confidence: 52%

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: Resultsmentioning

confidence: 52%

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

et al. 2019

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“…Meanwhile, the evidence of the OSL emission in cerium-doped lutetium-aluminum garnet (LuAG) crystals was recently reported [7]. However, it should be noted that the possibilities of energy storage by mixed perovskite and garnet compounds were earlier suggested by our research group [8,9]. Apart from the scintillation properties, such an investigation indicates the potential and perspectives for dosimetric applications of investigated materials as well.…”

Section: Introductionmentioning

confidence: 97%

“…The latter is the primary importance of dosimetric applications. In this work, we want to refer to our previous paper [8], where luminescent and scintillating properties of Tb 3+ -and Eu 3+ -doped mixed perovskite crystals were investigated. In order to gain insight into the energy-storage mechanism of well-known YAP crystals, we also study some basic dosimetric properties, such as dose-response, fading, and the lowest measurable dose, as well as undertake the analysis of kinetic parameters.…”

Section: Introductionmentioning

confidence: 99%

Scintillation and Energy-Storage Properties of Micro-Pulling-Down Grown Crystals of Sc3+- and La3+-Doped YAlO3 Perovskite

et al. 2020

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The scintillation and energy-storage properties of YAlO3 (YAP) crystals doped with Sc3+ and La3+ isoelectronic dopants were investigated in this work. The YAP:Sc and YAP:La crystals were grown from the melt with a nominal Sc and La content in the 0.2–5.0 mol.% range using the novel micro-pulling-down method. We found that the segregation coefficient of Sc ions in YAP:Sc (0.2–1.0 mol.%) crystals is about of 0.35–0.4 and decreases to around 0.2 at Sc content of 5.0 mol.% when the segregation coefficient of La ions in YAP:La (1.0–5.0 mol.%) crystals is 0.008–0.01. The scintillation and stimulated luminescence phenomena, like thermo- and photoluminescence, were utilized for the property characterization of the studied materials. The cathodoluminescence and X-ray-excited luminescence were used for the imitation of scintillation in the YAP:Sc and YAP:La crystals. The influence of Sc3+ and La3+ dopant concentration on the CL and RL emission spectra, as well as the shape of the measured thermoluminescence (TL) glow-curves, was also investigated. The measured emission spectra showed dominant emission of Sc3+ and La3+ ions in the UV range. For this reason, the YAP:Sc and YAP:La crystals can be considered for creation of ultraviolet (UV)-emitting scintillators. For the undoped YAlO3 crystals, the main TL emission peak occurs in a low-temperature range at 375 K. Meanwhile, even a small addition of dopants causes a strong suppression of luminescence of the YAP host and high-temperature peaks become dominant in the TL glow-curves of YAP:Sc and YAP:La crystals. Moreover, the amplitude of emission does not change monotonically with increasing dopant content. The kinetic parameters of emission were also evaluated, and the first-order behavior was confirmed in all cases. The dosimetric properties of investigated materials such as dose response, fading rate, and the lowest measurable dose are also discussed. The obtained results tend to suggest that the YAlO3 perovskite host, apart from its application for the development of efficient scintillators, may also be considered as a promising matrix for the creation of energy-storage phosphors for dosimetric applications.

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“…For example, from the luminescence studies under synchrotron radiation excitation, it is known that LuAlO 3 has a band gap width at least 0.6 eV larger than YAlO 3 , 18 , 19 whereas GdAlO 3 probably has a narrower band gap than YAlO 3 . 20 The replacement of Gd by La gradually decreases the E g of Gd 1– x La x AlO 3 . 15 Therefore, there is an obvious lack of a systematic study demonstrating the effect of various rare-earth (R) cations on the band gap width of RAlO 3 perovskites.…”

Section: Introductionmentioning

confidence: 98%

“…Only scarce information about this issue can be found in the literature. For example, from the luminescence studies under synchrotron radiation excitation, it is known that LuAlO 3 has a band gap width at least 0.6 eV larger than YAlO 3 , , whereas GdAlO 3 probably has a narrower band gap than YAlO 3 . The replacement of Gd by La gradually decreases the E g of Gd 1– x La x AlO 3 .…”

Section: Introductionmentioning

confidence: 99%

Band Gap Engineering and Trap Depths of Intrinsic Point Defects in RAlO₃ (R = Y, La, Gd, Yb, Lu) Perovskites

et al. 2021

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The possibility of band gap engineering (BGE) in RAlO 3 (R = Y, La, Gd, Yb, Lu) perovskites in the context of trap depths of intrinsic point defects was investigated comprehensively using experimental and theoretical approaches. The optical band gap of the materials, E g , was determined via both the absorption measurements in the VUV spectral range and the spectra of recombination luminescence excitation by synchrotron radiation. The experimentally observed effect of E g reduction from ∼8.5 to ∼5.5 eV in RAlO 3 perovskites with increasing R 3+ ionic radius was confirmed by the DFT electronic structure calculations performed for RM III O 3 crystals (R = Lu, Y, La; M III = Al, Ga, In). The possibility of BGE was also proved by the analysis of thermally stimulated luminescence (TSL) measured above room temperature for the far-red emitting (Y/Gd/La)AlO 3 :Mn 4+ phosphors, which confirmed decreasing of the trap depths in the cation sequence Y → Gd → La. Calculations of the trap depths performed within the super cell approach for a number of intrinsic point defects and their complexes allowed recognizing specific trapping centers that can be responsible for the observed TSL. In particular, the electron traps of 1.33 and 1.43 eV (in YAlO 3 ) were considered to be formed by the energy level of oxygen vacancy (V O ) with different arrangement of neighboring Y Al and V Y , while shallower electron traps of 0.9–1.0 eV were related to the energy level of Y Al antisite complexes with neighboring V O or (V O + V Y ). The effect of the lowering of electron trap depths in RAlO 3 was demonstrated for the V O -related level of the (Y Al + V O + V Y ) complex defect for the particular case of La substituting Y.

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Luminescent properties of Tb and Eu activated AxB1-xAlO3 (A = Y, Lu, Gd; B = Lu; x = 0, 0.5, 1) mixed oxides crystals prepared by micro-pulling-down method

Cited by 9 publications

References 19 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

Scintillation and Energy-Storage Properties of Micro-Pulling-Down Grown Crystals of Sc3+- and La3+-Doped YAlO3 Perovskite

Band Gap Engineering and Trap Depths of Intrinsic Point Defects in RAlO₃ (R = Y, La, Gd, Yb, Lu) Perovskites

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Luminescent properties of Tb and Eu activated AxB1-xAlO3 (A = Y, Lu, Gd; B = Lu; x = 0, 0.5, 1) mixed oxides crystals prepared by micro-pulling-down method

Cited by 9 publications

References 19 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

Scintillation and Energy-Storage Properties of Micro-Pulling-Down Grown Crystals of Sc3+- and La3+-Doped YAlO3 Perovskite

Band Gap Engineering and Trap Depths of Intrinsic Point Defects in RAlO3 (R = Y, La, Gd, Yb, Lu) Perovskites

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Band Gap Engineering and Trap Depths of Intrinsic Point Defects in RAlO₃ (R = Y, La, Gd, Yb, Lu) Perovskites