Facile synthesis of Gd2O2SO4:Tb and Gd2O2S:Tb green phosphor nanopowders of unimodal size distribution and photoluminescence

Yan, Zhou; Fan, Li; Wang, Xuejiao; Zhu, Qi; Li, Xiaodong; Sun, Xudong; Li, Ji‐Guang

doi:10.1016/j.apt.2021.04.003

Cited by 16 publications

(4 citation statements)

References 36 publications

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“…For Gd 2 O 2 S:Tb (code number: UKL65/UF-R1) it was found equal to 1.232 µm (standard deviation = 0.424); for Gd 2 O 2 S:Tb (code number: UKL65/F-R1) it was found equal to 2.377 µm (standard deviation = 1.031); for Gd 2 O 2 S:Eu (code number: UKL63/UF-R1) it was found equal to 1.769 µm (standard deviation = 0.701); for Gd 2 O 2 S:Eu (code number: UKL63/N-R1) it was found equal to 3.644 µm (standard deviation = 1.170); for Gd 2 O 2 S:Pr,Ce,F (code number: UKL59CF/F-R1) it was found equal to 1.784 µm (standard deviation = 0.566); for Gd 2 O 2 S:Pr,Ce,F (code number: UKL59CF/S-R1) it was found equal to 3.677 µm (standard deviation = 1.542). From Tables 1 and 2 it can be seen that the average particle size of Gd 2 O 2 S varies with the concentration of the activator and the synthesis method [25]. For Gd 2 O 2 S:Tb, when the concentration of the Tb activator increases from 1.74 to 2.99, the average particle size also increases from 1.232 to 2.377 µm.…”

Section: The Structural Properties Of the Phosphor Samplesmentioning

confidence: 95%

Grain Size Distribution Analysis of Different Activator Doped Gd2O2S Powder Phosphors for Use in Medical Image Sensors

Liaparinos

Michail

Valais

et al. 2022

Sensors

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The structural properties of phosphor materials, such as their grain size distribution (GSD), affect their overall optical emission performance. In the widely used gadolinium oxysulfide (Gd2O2S) host material, the type of activator is one significant parameter that also changes the GSD of the powder phosphor. For this reason, in this study, different phosphors samples of Gd2O2S:Tb, Gd2O2S:Eu, and Gd2O2S:Pr,Ce,F, were analyzed, their GSDs were experimentally determined using the scanning electron microscopy (SEM) technique, and thereafter, their optical emission profiles were investigated using the LIGHTAWE Monte Carlo simulation package. Two sets of GSDs were examined corresponding to approximately equal mean particle size, such as: (i) 1.232 μm, 1.769 μm and 1.784 μm, and (ii) 2.377 μm, 3.644 μm and 3.677 μm, for Tb, Eu and Pr,Ce,F, respectively. The results showed that light absorption was almost similar, for instance, 25.45% and 8.17% for both cases of Eu dopant utilizing a thin layer (100 μm), however, given a thicker layer (200 μm), the difference was more obvious, 22.82%. On the other hand, a high amount of light loss within the phosphor affects the laterally directed light quanta, which lead to sharper distributions and therefore to higher resolution properties of the samples.

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Section: The Structural Properties Of the Phosphor Samplesmentioning

confidence: 95%

Grain Size Distribution Analysis of Different Activator Doped Gd2O2S Powder Phosphors for Use in Medical Image Sensors

Liaparinos

Michail

Valais

et al. 2022

Sensors

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“…The negligibly weak blue emissions at ∼454 nm ( 5 D 3 → 7 F 3 transition) and 469 nm ( 5 D 3 → 7 F 2 transition), with I 547 /I 454 and I 547 /I 469 intensity ratios (I g /I b ratios) of ∼27.5, indicate the occurrence of 5 D 3 + 7 F 6 → 5 D 4 + 7 F 0 cross-relaxation between two adjacent Tb 3+ ions, which tends to quench the luminescence from the 5 D 3 energy level. Complete quenching of 5 D 3 emission is usually observed at a relatively low Tb 3+ content, such as ∼10 atom % in Y 2 O 3 , 43 3 atom % in Gd 2 O 2 S, 44 7 atom % in La 2 O 2 SO 4 , 45 and 10 atom % in Y 4 Al 2 O 9 . 46 The still observable 5 D 3 emission even at 100 atom % of Tb 3+ in this work is ascribable to the layered structure of NH 4 Tb(MoO 4 ) 2 , which confines the Tb 3+ −Tb 3+ interaction to the Tb-containing layer only (Figure 4).…”

Section: Derivation Viamentioning

confidence: 99%

Systematic Crystallization of NH₄Ln(MoO₄)₂ as a Family of Layered Compounds (Ln = La–Lu and Y), Derivation of Ln₂Mo₄O₁₅, Crystal Structure, and Photoluminescence

Zhu

et al. 2022

Inorg. Chem.

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NH 4 Ln(MoO 4 ) 2 (Ln = La−Lu lanthanide, Y) was crystallized via hydrothermal reaction as a new family of layered materials, from which phase-pure Ln 2 Mo 4 O 15 was successfully derived via subsequent annealing at 700 °C for the series of Ln elements excluding Ce and Lu. Detailed structure analysis revealed that the ionic size of Ln 3+ decisively determined the crystal structure and Mo/Ln coordination for the two families of compounds. NH 4 Ln(MoO 4 ) 2 was analyzed to be orthorhombic (Pbcn space group, no. 60) and monoclinic (P2/c, no. 13) for the larger and smaller Ln 3+ of Ln = La−Gd and Ln = Tb−Lu (including Y), respectively, where both the crystal structures have a layered topology featured by the alternative stacking of a [Ln(MoO 4 ) 2 ] − three-tier infinite anionic layer and interlayer NH 4 + . Four types of crystal structures were found for the Ln 2 Mo 4 O 15 series, which are monoclinic (P2 1 /a, no. 14) for Ln = La, triclinic (P1̅ , no. 2) for Ln = Pr−Sm, triclinic (P1̅ , no. 2) for Ln = Eu and Gd, and monoclinic (P2 1 /c, no. 14) for Ln = Tb−Yb (including Y). The photoluminescence of NH 4 Ln(MoO 4 ) 2 (Ln = Eu, Tb) and Ln 2 Mo 4 O 15 :Eu 3+ (Ln = La, Gd, Y) was thoroughly investigated in terms of spectral features, quantum efficiency, fluorescence decay, and CIE chromaticity. The thermal stability of luminescence was also studied for Ln 2 Mo 4 O 15 :Eu 3+ , and the observed charge-transfer excitation components were successfully correlated with the features of the Mo−O polyhedron/unit.

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“…The compound is also known to be an excellent host for photoluminescence, because of its wide bandgap (∼4.6–4.8 eV), low phonon energy (about 520 cm −1 ), and good tolerance for activator doping 3–5 . Tb 3+ ‐doped Gd 2 O 2 S (Gd 2 O 2 S:Tb 3+ ) powder, for example, is widely used as a green phosphor in TV screens, cathode ray tubes, and X‐ray enhancement screens because of its high intrinsic conversion efficiency and high light yield 6,7 . Besides, Gd 2 O 2 S:Tb 3+ nano‐colloid was reported to be a useful fluorescent probe in biomarkers 8 .…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] Tb 3+ -doped Gd 2 O 2 S (Gd 2 O 2 S:Tb 3+ ) powder, for example, is widely used as a green phosphor in TV screens, cathode ray tubes, and X-ray enhancement screens because of its high intrinsic conversion efficiency and high light yield. 6,7 Besides, Gd 2 O 2 S:Tb 3+ nano-colloid was reported to be a useful fluorescent probe in biomarkers. 8 The Gd 2 O 2 S:Tb 3+ bulk ceramic fabricated via sintering, on the other hand, finds important application in scintillation bio-probing, high-resolution neutron radiography and X-ray computed tomography for its excellent attenuation property, scintillation efficiency, and imaging quality.…”

Section: Introductionmentioning

confidence: 99%

Systematic synthesis of (Gd₁₋_xLa_x)₂O₂SO₄:Tb³⁺ and (Gd₁₋_xLa_x)₂O₂S:Tb³⁺ nanophosphors for remarkably enhanced luminescence

Song,

Li,

Feng

et al. 2023

J Am Ceram Soc.

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Coprecipitation with rare‐earth nitrate, ammonium sulfate and ammonium hydroxide produced hydroxide‐type amorphous precursors incorporating sulfate and carbonate anions, from which [(Gd1‐xLax)0.99Tb0.01]2O2SO4 and [(Gd1‐xLax)0.99Tb0.01]2O2S (x = 0, 0.15, 0.3, 0.5, 0.65, 0.8, 1) were obtained as two series of nanophosphors by calcination at 950°C in air and hydrogen, respectively. The detailed characterization by XRD, SEM/TEM, BET and particle sizing confirmed that solid solutions were directly formed and that the products have small crystallite size, unimodal size distribution and high specific surface area, revealing the advantages of the synthesis method. Photoluminescence study revealed that La3+ admixture may significantly improve the 545 nm main emission of Tb3+ for both the phosphor series. Furthermore, the 545 nm main emission of [(Gd1‐xLax)0.99Tb0.01]2O2SO4 was identified to have an excellent thermal stability, which retained over 90% of its room temperature intensity at 150°C (no quenching for Gd2O2SO4:Tb3+). The two series of phosphors were comparatively studied for their excitation and luminescence performances, as a function of temperature and La3+ content, and the results were rationalized by considering bandgap, crystal structure, UV absorption, and the character of chemical bonds.This article is protected by copyright. All rights reserved

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Facile synthesis of Gd2O2SO4:Tb and Gd2O2S:Tb green phosphor nanopowders of unimodal size distribution and photoluminescence

Cited by 16 publications

References 36 publications

Grain Size Distribution Analysis of Different Activator Doped Gd2O2S Powder Phosphors for Use in Medical Image Sensors

Grain Size Distribution Analysis of Different Activator Doped Gd2O2S Powder Phosphors for Use in Medical Image Sensors

Systematic Crystallization of NH₄Ln(MoO₄)₂ as a Family of Layered Compounds (Ln = La–Lu and Y), Derivation of Ln₂Mo₄O₁₅, Crystal Structure, and Photoluminescence

Systematic synthesis of (Gd₁₋_xLa_x)₂O₂SO₄:Tb³⁺ and (Gd₁₋_xLa_x)₂O₂S:Tb³⁺ nanophosphors for remarkably enhanced luminescence

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Facile synthesis of Gd2O2SO4:Tb and Gd2O2S:Tb green phosphor nanopowders of unimodal size distribution and photoluminescence

Cited by 16 publications

References 36 publications

Grain Size Distribution Analysis of Different Activator Doped Gd2O2S Powder Phosphors for Use in Medical Image Sensors

Grain Size Distribution Analysis of Different Activator Doped Gd2O2S Powder Phosphors for Use in Medical Image Sensors

Systematic Crystallization of NH4Ln(MoO4)2 as a Family of Layered Compounds (Ln = La–Lu and Y), Derivation of Ln2Mo4O15, Crystal Structure, and Photoluminescence

Systematic synthesis of (Gd1−xLax)2O2SO4:Tb3+ and (Gd1−xLax)2O2S:Tb3+ nanophosphors for remarkably enhanced luminescence

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Systematic Crystallization of NH₄Ln(MoO₄)₂ as a Family of Layered Compounds (Ln = La–Lu and Y), Derivation of Ln₂Mo₄O₁₅, Crystal Structure, and Photoluminescence

Systematic synthesis of (Gd₁₋_xLa_x)₂O₂SO₄:Tb³⁺ and (Gd₁₋_xLa_x)₂O₂S:Tb³⁺ nanophosphors for remarkably enhanced luminescence