Complex terbium luminescence centers in spectral transformers based on CaSO4

Kudryavtseva, Irina; Lushchik, A.; Lushchik, Ch.; Maaroos, A.; Nagirnyi, V.; Pazylbek, S.; Tussupbekova, A.; Vasil’chenko, E.

doi:10.1134/s1063783415110219

Cited by 8 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, in ref. [44], a mixture of salts CaSO4, (NH4)2SO4, Tb4O7, TbCl3, NaCl, NaBr, and Na2SO4 was thoroughly ground in an agate mortar and heat treated at 750 °C for 2 h. These synthesis conditions are not appropriate for the production of gypsum cements owing to low temperature (160 °C) of transition of CS hemihydrate to anhydrous CS [45]. It is known that CS anhydride does not give rise to durable gypsum cement materials [46].…”

Section: Discussionmentioning

confidence: 99%

Effects of Tb<sup>3+</sup> on Properties of Luminescent Calcium Sulfate Cement

Khayrutdinova,

Goldberg,

Fomin

et al. 2023

Preprint

View full text Add to dashboard Cite

Calcium sulfate (CS) materials containing terbium ions at 0, 1.0, or 2.0 mol.% were obtained by mechanochemical synthesis. According to X-ray diffraction data, the powder materials are characterized by the presence of a CaSO4×0.5H2O phase, while Tb3+ is incorporated into the lattice at ≤1.0 mol.%. Specific surface area enlarged from 2.1 to 22.5 m2/g as crystallite size decreased from 68 to 31 nm and the Tb3+ concentration increased up to 1.0 mol.%. Thermal analysis showed that terbium slightly raises the temperature of CaSO4×2H2O-to-CaSO4 transition. The presence of Tb3+ did not affect the solubility of the CS cements. Furthermore, after 7 days of soaking of the materials in a simulated body fluid, a calcium phosphate layer formed corresponding to a hydroxyapatite phase, in contrast to the pure cements. Luminescent properties were studied by excitation at 276 nm. The recorded emission peaks of the CS materials indicated that the luminescence of the samples is green and blue, with the most intense luminescence observed for samples containing 1.0 mol.% Tb3+. The developed materials can find applications in medicine as bioimplants for the regeneration and restoration of bone tissue with a possibility of noninvasive monitoring of the bone restoration process.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of Tb<sup>3+</sup> on Properties of Luminescent Calcium Sulfate Cement

Khayrutdinova,

Goldberg,

Fomin

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…However, photodetectors used in ionizing radiation measurement are typically not sensitive in the far infrared spectrum. The value of Q can exceed unity upon excitation in polyatomic systems when the excitation energy of one of the participants in the cooperative process is divided between neighboring centers emitting the same spectrum [ 59 , 60 , 61 , 62 , 63 ].…”

Section: Next Step: Compositional Disordering Of the Materialsmentioning

confidence: 99%

Compositionally Disordered Crystalline Compounds for Next Generation of Radiation Detectors

et al. 2022

View full text Add to dashboard Cite

The review is devoted to the analysis of the compositional disordering potential of the crystal matrix of a scintillator to improve its scintillation parameters. Technological capabilities to complicate crystal matrices both in anionic and cationic sublattices of a variety of compounds are examined. The effects of the disorder at nano-level on the landscape at the bottom of the conduction band, which is adjacent to the band gap, have been discussed. The ways to control the composition of polycationic compounds when creating precursors, the role of disorder in the anionic sublattice in alkali halide compounds, a positive role of Gd based matrices on scintillation properties, and the control of the heterovalent state of the activator by creation of disorder in silicates have been considered as well. The benefits of introducing a 3D printing method, which is prospective for the engineering and production of scintillators at the nanoscale level, have been manifested.

show abstract

“…Later studies looked into the effect of quantum splitting, [2,3] which could convert the exciton energy of the SO 4 2À oxysulfide complex into two luminescence photons of Pr 3þ or Tb 3þ ions. It was recently shown [4,5] that direct excitation of Tb 3þ ions with an energy of 5.9 eV or oxyanions near terbium ions (8.1 eV) makes it possible to obtain a slight excess of unity for the quantum yield. At the same time, an increase in the quantum yield above unity promises a significant expansion of the scope of one of the important classes of phosphor scintillators.…”

Section: Introductionmentioning

confidence: 99%

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

Korzhik

Ретивов

Dosovitskiy

et al. 2023

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

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.

show abstract

Complex terbium luminescence centers in spectral transformers based on CaSO4

Cited by 8 publications

References 19 publications

Effects of Tb<sup>3+</sup> on Properties of Luminescent Calcium Sulfate Cement

Effects of Tb<sup>3+</sup> on Properties of Luminescent Calcium Sulfate Cement

Compositionally Disordered Crystalline Compounds for Next Generation of Radiation Detectors

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

Contact Info

Product

Resources

About

Complex terbium luminescence centers in spectral transformers based on CaSO4

Cited by 8 publications

References 19 publications

Effects of Tb<sup>3+</sup> on Properties of Luminescent Calcium Sulfate Cement

Effects of Tb<sup>3+</sup> on Properties of Luminescent Calcium Sulfate Cement

Compositionally Disordered Crystalline Compounds for Next Generation of Radiation Detectors

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

Contact Info

Product

Resources

About

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