Luminescence properties of ceramics based on terbium-doped gadolinium oxysulfide

Gorokhova, E. I.; Demidenko, V. A.; Khristich, O. A.; Mikhrin, S. B.; Родный, П. А.

doi:10.1364/jot.70.000693

Cited by 26 publications

(16 citation statements)

References 7 publications

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“…The excess pressure not only aid to reduce the reunion of GOST, but also increase viscosity of liquid fluxes, which slow down the growth rate of phosphor particles. Phosphors with PO 4 3-anions apparently tend to lager particle size ( Table 1) compared with that with Cland CO 3 2-fluxes. For this, Tang [13] reported the fact that PO 4 3-helps the recrystallization of GOST [16], which makes it easier to grow to larger particle.…”

Section: Characterizationmentioning

confidence: 98%

“…Phosphors with PO 4 3-anions apparently tend to lager particle size ( Table 1) compared with that with Cland CO 3 2-fluxes. For this, Tang [13] reported the fact that PO 4 3-helps the recrystallization of GOST [16], which makes it easier to grow to larger particle. This kind of anions has strong binding capacity, and may catch some metal ions.…”

Section: Characterizationmentioning

confidence: 98%

“…This kind of anions has strong binding capacity, and may catch some metal ions. That is to say, the PO 4 3-acts as ''cleaner'' to clean rare-earth ions on grains interface, so as to increase surface energy, thus promotes particle growth. However, Cl -is agglomerative, which could not help to meliorate phosphor particles.…”

Section: Characterizationmentioning

confidence: 99%

“…Terbium activated gadolinium oxysulfide phosphors (Gd 2 O 2 S:Tb abbreviated as GOST) is considered as one of the most effective phosphors in X-ray and UV imaging systems [1][2][3]. There were many comprehensive researches on it, trying to reduce particle size without decreasing luminescence intensity [4]. As for material characteristics, particle morphology can be controlled by changing synthesis methods and preparation conditions [5][6][7], and particle size distribution, morphology and photoluminescence performance are very important to phosphors.…”

Section: Introductionmentioning

confidence: 99%

“…Not only the effect of alkali-metal ions but also related anion ions: Cl -, CO 3 2-, PO 4 3-in particle morphology and luminescence performance were reported. Our results show that alkali metal compound fluxes could optimize particles morphology and increase luminescence at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Ding

Yang

Zhang

et al. 2015

J Mater Sci: Mater Electron

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Gd 2 O 2 S:Tb phosphors with different alkalimetal compound fluxes were synthesized by molten salt method, showing high luminous intensity, monodispersity and micron size characteristics. The results indicated that from K ? to Na ? and to Li ? , the particles mean size tended to grow bigger. K ? could effectively reduce the particle size without depressing the luminescence intensity. Meanwhile, after comparing the strongest emission intensity among different fluxes, it was shown that K ? had most significance on improving the luminescence intensity. Li ? could promote the formation of hexagonal morphology. It was also found that CO 3 2-, PO 4 3-had prominent effects on optimizing particles size (at 254 nm excitation).

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Section: Characterizationmentioning

confidence: 98%

Section: Characterizationmentioning

confidence: 98%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Ding

Yang

Zhang

et al. 2015

J Mater Sci: Mater Electron

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Assessing the accuracy of electronic portal imaging device (EPID)‐based dosimetry: I. Quantities influencing long‐term stability

Renaud

Muir

2022

Medical Physics

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The aim of this study is to reduce the uncertainty associated with determining dose-to-water using an amorphous silicon electronic portal imaging detector (EPID) under reference conditions by identifying and accounting for operational and environmental factors influencing the long-term stability of EPID response. Methods: Measurements of the EPID relative response,corrected for variations in linear accelerator (linac) output, were performed regularly over a period of 12 months. For every acquired image set, measurements of detector supply voltages, internal operating temperature, and ambient environmental conditions were obtained. Pearson r correlation coefficients were then calculated for each pair of variables, a subset of which were fitted using multiple linear regression to develop a predictive model of EPID response. Principal component analysis was performed on the dataset to reveal the internal structure of the data in a way that best accounts for the observed variations. Results: The +5.5 V power supply voltage, internal operating temperature, and the accumulated dose absorbed in EPID were identified as having the greatest influence on the long-term stability of EPID response. By correcting for the combined effect of these variables, the mean difference in linac output as measured by the EPID relative to a reference class chamber improved from -0.46% to 0.23% over the period of the study. Conclusions: This work suggests that the stability of an EPID over a period of a year can be improved by a factor of two by monitoring and accounting for the effects of variations in power supply voltage, internal temperature of the detector, and accumulated absorbed dose.

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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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Luminescence properties of ceramics based on terbium-doped gadolinium oxysulfide

Cited by 26 publications

References 7 publications

Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Assessing the accuracy of electronic portal imaging device (EPID)‐based dosimetry: I. Quantities influencing long‐term stability

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

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Luminescence properties of ceramics based on terbium-doped gadolinium oxysulfide

Cited by 26 publications

References 7 publications

Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Assessing the accuracy of electronic portal imaging device (EPID)‐based dosimetry: I. Quantities influencing long‐term stability

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

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