Thermally Stimulated Luminescent (TSL) Materials

Shinsho, Kiyomitsu

doi:10.1002/9781119583363.ch7

Cited by 3 publications

(3 citation statements)

References 73 publications

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“…It indicates that Al 3+ codoping reduces the concentrations of shallow-energy level traps present in LiF-CaF 2 :Eu 2+ . The TL spectra were further analyzed through fitting the TL curves with a general-order kinetic: I false( T false) = s n 0 ⁡ exp true( prefix− E k T true) true[ 1 + false( b − 1 false) s β ∫ T 0 T exp true( − E k T true) d T true] − 1 b − 1 where I ( T ) is the corresponding TL intensity at temperature T , s is the trap electron escape frequency, E is the trap depth, b is the kinetic level, β is the heating rate, T 0 is the starting temperature, and k is the Boltzmann constant. Figure b shows the results of fitting the TL spectra of a CaF 2 :Eu 2+ single crystal.…”

Section: Resultsmentioning

confidence: 99%

Al³⁺ Codoped LiF-CaF₂:Eu²⁺ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Zhou,

Zhao,

Yao

et al. 2024

ACS Appl. Opt. Mater.

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Eutectic scintillators with 6 Li-containing thermal neutron absorbers are capable of efficient thermal neutron detection due to lamellar or rod-like optical waveguide structures formed by directional solidification. However, developing stable and bright eutectic scintillators with excellent neutron imaging capability remains a challenge. Here, the performance parameters for the scintillator have been substantially improved by the Al 3+ codoping strategy in the LiF-CaF 2 :Eu 2+ system. Due to the Al 3+ codoping, the photoluminescence quantum yield (PLQY) is enhanced from 55% to 80%, the light yield is increased from 11,000 to 16,000 photons/thermal neutron, and the scintillation decay time is shortened by about 30 ns. It was shown that Al 3+ codoping can effectively reduce the low-frequency shallow-energy level traps. Furthermore, large-sized (50 × 50 × 1.5 mm) translucent LiF-CaF 2 :Eu 2+ , Al 3+ eutectic ceramics have been fabricated for an Anger-logic position-sensitive detector to realize two-dimensional (2D) thermal neutron detection. A codoped LiF-CaF 2 eutectic scintillator provides a ∼1 mm spatial resolution and thermal neutron detection efficiency 16% higher than that of a commercial GS20 scintillator. This research paves the way for the application of large-area eutectic scintillators for efficient thermal neutron detection.

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Section: Resultsmentioning

confidence: 99%

Al³⁺ Codoped LiF-CaF₂:Eu²⁺ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Zhou,

Zhao,

Yao

et al. 2024

ACS Appl. Opt. Mater.

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“…Therefore, the luminescence intensity is proportional to the irradiated dose, which is used as a probe of accumulated exposure dose in radiation dosimetry. 4,5) However, because the TL and OSL use the stored charges for luminescence, a readout process is destructive. Therefore, if there is any accident during a readout, the recorded signal can never be remeasured again.…”

Section: Introductionmentioning

confidence: 99%

Radiophotoluminescence properties of Eu-doped Li₂SrSiO₄ for radiation detectors

Takebayashi,

Okada,

Nanto

2023

Jpn. J. Appl. Phys.

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To search for new radiophotoluminescence (RPL) materials, Eu-doped Li2SrSiO4 was synthesized by the solid-state reaction and then studied its RPL properties for radiation detector applications. All the samples were identified to be Li2SrSiO4 by X-ray diffraction. The as-prepared sample shows photoluminescence (PL) due to Eu3+ while an additional PL band appears due to a formation of Eu2+ after X-ray irradiation. This indicates that the Eu-doped Li2SrSiO4 has RPL properties. The sensitivity of RPL (or PL intensity of Eu2+) to X-ray dose is the highest when the Eu concentration is 0.1%, and the dynamic range is 5-10000 mGy. In addition, the generated Eu2+ is so stable that only 2% of the signal degrades over 20 minutes after irradiation. The RPL signal notably decreases to about 30% of the initial value by heating at 500°C for 100 seconds, and it is reproducible multiple times even after the heat treatment.

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“…RPL is a very unique phenomenon compared with other types of luminescence used for radiation measurements, which include scintillation, 3) thermally-stimulated luminescence (TSL), 4,5) and optically-stimulated luminescence (OSL). [6][7][8] Scintillation shows luminescence only during the interaction with ionizing radiation.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in radiophotoluminescence materials for luminescence dosimetry

Okada

Koguchi²,

Yanagida

et al. 2022

Jpn. J. Appl. Phys.

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Radiophotoluminescence (RPL) is a phenomenon in which a luminescence centre is formed in a medium upon interaction with ionizing radiation. The RPL is observed by a conventional photoluminescence (PL) technique, and the PL intensity is proportional to the dose. With the latter feature, the RPL has found successful applications in personnel and environmental dosimetry. However, the conventional materials considered for radiation measurements may be limited to Ag-doped phosphate glass, LiF, and Al2O3:C,Mg. The recent research works, however, have found a number of additional RPL materials for luminescence dosimetry. The aim of the present paper is to review the series of newly reported RPL materials and potential applications in dosimetry.

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Thermally Stimulated Luminescent (TSL) Materials

Cited by 3 publications

References 73 publications

Al³⁺ Codoped LiF-CaF₂:Eu²⁺ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Al³⁺ Codoped LiF-CaF₂:Eu²⁺ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Radiophotoluminescence properties of Eu-doped Li₂SrSiO₄ for radiation detectors

Recent advances in radiophotoluminescence materials for luminescence dosimetry

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Thermally Stimulated Luminescent (TSL) Materials

Cited by 3 publications

References 73 publications

Al3+ Codoped LiF-CaF2:Eu2+ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Al3+ Codoped LiF-CaF2:Eu2+ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Radiophotoluminescence properties of Eu-doped Li2SrSiO4 for radiation detectors

Recent advances in radiophotoluminescence materials for luminescence dosimetry

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Product

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Al³⁺ Codoped LiF-CaF₂:Eu²⁺ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Al³⁺ Codoped LiF-CaF₂:Eu²⁺ Bright Eutectic Scintillators for Large-Area Thermal Neutron Detectors

Radiophotoluminescence properties of Eu-doped Li₂SrSiO₄ for radiation detectors