Growth and characterization of Ce-doped YAG and LuAG fibers

Djebli, Abdelkrim; Boudjada, Fahima; Pauwels, K.; Kononets, V.; Patton, Gaël; Benaglia, A.; Lucchini, M. T.; Moretti, Federico; Sidletskiy, O.; Dujardin, Christophe; Lecoq, P.; Auffray, E.; Lebbou, Kheirréddine

doi:10.1016/j.optmat.2016.09.028

Cited by 18 publications

(12 citation statements)

References 16 publications

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“…materials in the high-tech industry, medicine and security imaging and monitoring systems [5,6,7], and in the solid state white light sources [8]. In spite of the favorable scintillation properties, the main demerit of both YAG and LuAG is the presence of slow components in the scintillation decay, which causes serious degradation of the light yield and timing characteristics [9,10].…”

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confidence: 99%

Oxygen-vacancy donor-electron center in Y3Al5O12 garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study

et al. 2020

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F + center, an electron trapped at oxygen vacancy (VO), was investigated in the oxygen deficient Y3Al5O12 (YAG) garnet crystals by electron paramagnetic resonance (EPR). The measurements were performed in the wide temperature interval 5450 K and the frequency region 9.4350 GHz with using both the conventional continue wave and pulse EPR technique. The pulse electron-nuclear double resonance was applied to resolve the hyperfine interaction of the trapped electron with surrounding nuclei. The measurements show that at low temperatures, T < 50 K, EPR spectrum of the F + center is anisotropic with g factors in the range 1.9991.988 and originates from three magnetically inequivalent positions of the center in garnet lattice according to different directions of the Al(IV) -VO -Al(VI) chains, where Al(IV) and Al(VI) are the tetrahedral and octahedral Al sites, respectively. As the temperature increases, the EPR spectrum becomes isotropic suggesting a motional averaging of the anisotropy due to motion of F + -center electron between neighboring oxygen vacancies. With further increase of the temperature to T > 200 K, we observed delocalization of the F + -center electron into the conduction band with the activation energy about 0.40.5 eV that resulted in substantial narrowing of the EPR spectral line with simultaneous change of its shape from the Gaussian to Lorentzian due to diminish up to zero of the Fermi contact hyperfine field at 27 Al and 89 Y nuclei. Such temperature behavior of the F + -center electron in YAG is completely similar to behavior of a donor electron in a semiconductor. Our findings is further supported by measurements of the conductivity and dielectric properties. In particular, these data show that the conduction electrons are not homogeneously distributed in the crystal: there are high-conductive regions separated by poorly-conductive dielectric layers. This leads to the so-called Maxwell-Wagner dielectric relaxation with huge apparent dielectric constant at low frequencies. To the best of our knowledge, this is probably the first observation of a donor-like behavior of F + center in wide band-gap insulating crystals.

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Oxygen-vacancy donor-electron center in Y3Al5O12 garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study

et al. 2020

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“… Pulling rates. Different fiber pulling rates within the 0.15-0.7 mm/min range were chosen basing on our experience in growth of YAG:Ce and LuAG:Ce fibers [29,30]. In most cases, each long (>20 cm) fiber was grown with a constant growth rate.…”

Section: Growth Of Yag:ce and Yag:cemg Fibersmentioning

confidence: 99%

Development of YAG:Ce,Mg and YAGG:Ce Scintillation Fibers

Kononets

Lebbou

Sidletskiy

et al. 2017

Springer Proceedings in Physics

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The chapter overviews the status of works on fabrication of long garnet fibers for application in high energy physics experiments. Y3Al5O12:Ce,Mg (YAG:Ce,Mg) and Y3Al5-xGaxO12:Ce (YAGG:Ce) fibers are grown by the µ-PD method. The scintillation and optical parameters of fibers are controlled by optimization of concentration of isovalent (Ga 3+) and aliovalent (Mg 2+) codoping, as well as by choice of growth parameters.

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“…At present, inorganic scintillation materials have been widely studied because of their irreplaceable role in the fields of high energy physics, medical imaging and nuclear energy technology, etc. [1][2][3][4]. In addition to the traditional inorganic scintillation crystals BGO and NaI [5], which have been widely used, YAG [6], LuAG [7], YAP [8], and Lu 2 SiO 5 , Lu 2-x Y x SiO 5 (LSO, LYSO) [9,10] and Y 2 SiO 5 (YSO) [11] have also been rapidly developed under the promotion of application requirements.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, some new perspective materials such as Bi 2 O 3 -Na 2 O-TiO 2 -ZnO-TeO 2 [12] and Bi Coatings [13] also show good performance in radiation shielding and detection, but their application in detectors is not very mature. Among them, Ce:LuAG has relatively high density, high effective atomic number (ρ = 6.7 g/cm 3 , Zeff = 60), short decay time (~50 ns), high theoretical light yield (25,000 photons MeV −1 ) [14][15][16], and good mechanical and chemical stability. Moreover, the wide emission of 5d-4f radiative transition of Ce 3+ at 530 nm matches the spectral sensitivity of photodetectors used in high energy physics very well [17], so Ce:LuAG is considered to be one of the representatives of a new generation of scintillator crystals.…”

Section: Introductionmentioning

confidence: 99%

Growth and Characterization of Ce-Doped Luag Single Crystal Fibers from Transparent Ceramics by Laser-Heated Pedestal Method

et al. 2021

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Scintillation single crystal fibers (SCFs) have great potential applications in the new generation of high-energy ray and particle detectors due to their morphological advantages. In this work; Ce:LuAG SCFs with a diameter of 1 mm were grown along the direction of [111] by laser-heated pedestal growth (LHPG) method using a transparent ceramic as the source rod; and a doping concentration was 0.1 at%, 0.3 at%, 1 at%, respectively. The effects of growth rate and annealing in air on the scintillation and optical properties of SCF are discussed in detail. The results of analyzing the absorption spectra; radioluminescence (RL) spectra; pulse-height spectra and fluorescence lifetime of SCFs show that the SCF maintains excellent scintillation performance while having a fiber structure. Therefore; Ce:LuAG SCF is a potential candidate material for detector.

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Growth and characterization of Ce-doped YAG and LuAG fibers

Cited by 18 publications

References 16 publications

Oxygen-vacancy donor-electron center in Y3Al5O12 garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study

Oxygen-vacancy donor-electron center in Y3Al5O12 garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study

Development of YAG:Ce,Mg and YAGG:Ce Scintillation Fibers

Growth and Characterization of Ce-Doped Luag Single Crystal Fibers from Transparent Ceramics by Laser-Heated Pedestal Method

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