Resonant processes causing photon multiplication in CaSO4:Tb3+

Lushchik, A.; Lushchik, Ch.; Kudryavtseva, Irina; Maaroos, A.; Nagirnyi, V.; Savikhin, F.

doi:10.1016/j.radmeas.2013.01.037

Cited by 13 publications

(9 citation statements)

References 14 publications

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“…Manifestations of such 'excitons' have been detected in Sc 2 O 3 [3], and a similar situation is expected to be realized in CaSO 4 as well (see, e.g. [5]).…”

Section: Introductionsupporting

confidence: 53%

Electronic excitations and self-trapping of electrons and holes in CaSO₄

et al. 2014

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A first-principles study of the electronic properties of a CaSO4 anhydrite structural phase has been performed. A theoretical estimation for the fundamental band gap (p → s transitions) is Eg = 9.6 eV and a proper threshold for p → d transitions is Epd = 10.8 eV. These values agree with the data obtained for a set of CaSO4 doped with Gd3+, Dy3+, Tm3+ and Tb3+ ions using the methods of low-temperature highly sensitive luminescence and thermoactivation spectroscopy. The results are consistent with theoretical predictions of a possible low-temperature self-trapping of oxygen p-holes. The hopping diffusion of hole polarons starts above ∼40 K and is accompanied by a ∼50–60 K peak of thermally stimulated luminescence of RE3+ ions caused due to the recombination of hole polarons with the electrons localized at RE3+. There is no direct evidence of the self-trapping of heavy d-electrons, however, one can argue that their motion rather differs from that of conduction s-electrons.

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“…Manifestations of such 'excitons' have been detected in Sc 2 O 3 [3], and a similar situation is expected to be realized in CaSO 4 as well (see, e.g. [5]).…”

Section: Introductionsupporting

confidence: 53%

Electronic excitations and self-trapping of electrons and holes in CaSO₄

et al. 2014

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“…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

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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.

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“…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

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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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Resonant processes causing photon multiplication in CaSO4:Tb3+

Abstract: The emission spectra of single and polyterbium centers have been measured at the excitation of

Cited by 13 publications

References 14 publications

Electronic excitations and self-trapping of electrons and holes in CaSO₄

Electronic excitations and self-trapping of electrons and holes in CaSO₄

Compositionally Disordered Crystalline Compounds for Next Generation of Radiation Detectors

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

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Resonant processes causing photon multiplication in CaSO4:Tb3+

Abstract: The emission spectra of single and polyterbium centers have been measured at the excitation of

Cited by 13 publications

References 14 publications

Electronic excitations and self-trapping of electrons and holes in CaSO4

Electronic excitations and self-trapping of electrons and holes in CaSO4

Compositionally Disordered Crystalline Compounds for Next Generation of Radiation Detectors

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

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Product

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Electronic excitations and self-trapping of electrons and holes in CaSO₄

Electronic excitations and self-trapping of electrons and holes in CaSO₄

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