Gd3+ content optimization for mastering high light yield and fast Gd Al2Ga3O12:Ce3+ scintillation ceramics

Retivov, V. M.; Dubov, Valery; Kuznetsova, Daria; Ismagulov, Artem; Korzhik, M.

doi:10.1016/j.jre.2022.09.018

Cited by 24 publications

(12 citation statements)

References 37 publications

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“…The TL spectra demonstrate significant variations in the intensity, the number of maxima, and their positions as influenced by varying Sc 3+ ion concentrations. The observed differences in the TL spectra are mainly due to the impact of Sc substitution within the crystal structure, which introduces defect structures and alters the crystal field environment, thus affecting the luminescent properties of the crystals [ 49 , 50 , 51 ]. For instance, the TL intensity shows noticeable variability across samples with different Sc 3+ ion concentrations.…”

Section: Resultsmentioning

confidence: 99%

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

Bartosiewicz,

Tomala,

Szymański

et al. 2024

Materials

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Aluminum garnets display exceptional adaptability in incorporating mismatching elements, thereby facilitating the synthesis of novel materials with tailored properties. This study explored Ce3+-doped Tb3Al5−xScxO12 crystals (where x ranges from 0.5 to 3.0), revealing a novel approach to control luminescence and photoconversion through atomic size mismatch engineering. Raman spectroscopy confirmed the coexistence of garnet and perovskite phases, with Sc substitution significantly influencing the garnet lattice and induced A1g mode softening up to Sc concentration x = 2.0. The Sc atoms controlled sub-eutectic inclusion formation, creating efficient light scattering centers and unveiling a compositional threshold for octahedral site saturation. This modulation enabled the control of energy transfer dynamics between Ce3+ and Tb3+ ions, enhancing luminescence and mitigating quenching. The Sc admixing process regulated luminous efficacy (LE), color rendering index (CRI), and correlated color temperature (CCT), with adjustments in CRI from 68 to 84 and CCT from 3545 K to 12,958 K. The Ce3+-doped Tb3Al5−xScxO12 crystal (where x = 2.0) achieved the highest LE of 114.6 lm/W and emitted light at a CCT of 4942 K, similar to daylight white. This approach enables the design and development of functional materials with tailored optical properties applicable to lighting technology, persistent phosphors, scintillators, and storage phosphors.

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Section: Resultsmentioning

confidence: 99%

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

Bartosiewicz,

Tomala,

Szymański

et al. 2024

Materials

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“…[31] The structural properties of the translucent ceramic samples were found to be similar to those described elsewhere. [32] The luminescence and excitation spectra were measured using a PETRA III synchrotron radiation source (DESY, Hamburg) on the P66 channel, [33] which provides the study of luminescence upon excitation by photons in the ultraviolet and vacuum ultraviolet ranges (3.7-40 eV).…”

Section: Samples and Measurementsmentioning

confidence: 99%

“…[ 31 ] The structural properties of the translucent ceramic samples were found to be similar to those described elsewhere. [ 32 ]…”

Section: Samples and Measurementsmentioning

confidence: 99%

First Observation of the Scintillation Cascade in Tb³⁺‐Doped Quaternary Garnet Ceramics

Korzhik

Ретивов

Dosovitskiy

et al. 2023

Physica Rapid Research Ltrs

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A mechanism of firefly high‐scintillation light yield (LY) of Tb‐doped quaternary (Gd, Y)3Al2Ga3O12 garnet ceramics is reported. Through measurements with the synchrotron source, the high efficiency of the luminescence excitation, providing a quantum yield Q > 1 below the photon multiplication energy range, is defined. The excitation efficiency reaches two at the excitation energy slightly above 2Eg. The cascade of photons is explained by combining three factors: first, the high quantum yield Q ≈ 1 of the luminescence at excitation in lower mixed states 4f75d1 with high spin (HS) and low spin (LS); second, the cross‐relaxation 4f7(6P)5d1(HS) → 4f7(8S)5d1(HS) provides the excitation of 4f8(7F0) →4f8(5D1,4) transition of the 4f8 configuration of the same or neighboring Tb ion, which is followed by the luminescence from 5D1,4; and finally, the relaxation of 4f7(8S)5d1‐5(HS) configuration into the excited 4f8 configuration occurs with future emission from 4f8(5D1,4) states. This cascade forms the final stage of the scintillation in the compound being studied and provides a LY twice as high compared with the material when doped with Ce.

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“…Inorganic single-crystal scintillators are widely utilized in X-ray indirect detection and imaging applications, owing to their exceptional light output and energy resolution. − Examples of these scintillators comprise the following CsI:Tl, Lu 1.8 Y 0.2 SiO 5 (LYSO), Bi 4 Ge 3 O 12 (BGO), typically synthesized through the Czochralski or Bridgman methods. Though effective, these methods often lead to high energy consumption, significant material loss, and the introduction of internal stresses within the crystal attributable to its contact with the crucible. , In recent years, the focus of materials scientists has shifted toward the structural design and flexible manufacturing of novel scintillators, providing an advantage in terms of compatibility with various product structures.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Synthesis of Hollow Double Perovskite Nanocrystals and Their Applications in X-ray Imaging

Wang,

Men

et al. 2024

Inorg. Chem.

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Rare earth-based halide double perovskites are regarded as an emerging class of X-ray scintillation materials. However, the majority of related scintillator applications are still focused on single crystal and powder systems; the application of nanocrystal (NC) scintillators is rarely reported. Here, we present the synthesis of high-purity Cs 2 NaTbCl 6 NCs by an improved hot-injection method. Interestingly, hollow Cs 2 NaTbCl 6 NCs are observed, the monitoring of the growth process indicates that micrometersized NaCl is the initial product, and then the NaCl would convert into Cs 2 NaTbCl 6 NCs through the diffusion of Cs + and Tb 3+ into NaCl lattice, and the faster outward diffusion of Na + results in the formation of hollow NCs. The double perovskite NCs exhibit green light emission, and the photoluminescence intensity can be significantly enhanced through Ce 3+ doping. In particular, the Cs 2 NaTbCl 6 :5%Ce 3+ scintillator exhibits a linear response and a low detection limit of 79.09 nGy/s when exposed to X-rays. Furthermore, a flexible scintillator film for X-ray imaging is prepared by mixing NCs with polymer, showing a high spatial resolution imaging capability of 10 lp/mm. This work provides a new strategy for hollow perovskite NCs and may shed light on the synthesis of related hollow NCs and their applications in X-ray detection.

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Gd3+ content optimization for mastering high light yield and fast Gd Al2Ga3O12:Ce3+ scintillation ceramics

Cited by 24 publications

References 37 publications

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

First Observation of the Scintillation Cascade in Tb³⁺‐Doped Quaternary Garnet Ceramics

Colloidal Synthesis of Hollow Double Perovskite Nanocrystals and Their Applications in X-ray Imaging

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Gd3+ content optimization for mastering high light yield and fast Gd Al2Ga3O12:Ce3+ scintillation ceramics

Cited by 24 publications

References 37 publications

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

Micro-Inclusion Engineering via Sc Incompatibility for Luminescence and Photoconversion Control in Ce3+-Doped Tb3Al5−xScxO12 Garnet

First Observation of the Scintillation Cascade in Tb3+‐Doped Quaternary Garnet Ceramics

Colloidal Synthesis of Hollow Double Perovskite Nanocrystals and Their Applications in X-ray Imaging

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First Observation of the Scintillation Cascade in Tb³⁺‐Doped Quaternary Garnet Ceramics