Synthesis and luminescence characteristics of Dy3+ doped KLa(PO3)4

Chemingui, S.; Ferhi, M.; Horchani−Naifer, Karima; Férid, Mokhtar

doi:10.1016/j.jlumin.2015.05.018

Cited by 97 publications

(42 citation statements)

References 40 publications

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“…In case of Dy 3+ , the 4 F 9/2 → 6 H 13/2 transition (yellow emission) is a hypersensitive electronic dipole transition allowed only at low symmetries with no inversion center which has been strongly influenced by the coordination environment, whereas the 4 F 9/2 → 6 H 15/2 transition (blue emission) is a magnetic dipole transition and less sensitive to the coordination environment . Moreover, the emission intensities increases with increase in Dy 3+ concentration and similar observations have also been reported for Dy 3+ by Chemingui et al . The magnetic moments of Dy 3+ are mainly due to the 4 f electrons and the ordering of their moments occurs at very low temperatures .…”

Section: Discussionsupporting

confidence: 78%

Structural insights in Dy³⁺‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

et al. 2017

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A series of Dysprosium (Dy3+) doped β‐Tricalcium phosphate [β‐TCP, β‐Ca3(PO4)2] were developed for applications in magnetic resonance imaging (MRI) and computed tomography (CT). Characterization studies confirmed the Dy3+ occupancy at Ca2+(1), Ca2+(2), and Ca2+(3) lattice sites of β‐Ca3(PO4)2 and its substitution limit was determined as 4.35 mol%. The transitions from the 6H15/2 ground state to various excited energy levels is validated by the characteristic absorption peaks of Dy3+. Luminescence studies inferred two intense bands at 480 and 572 nm due to 4F9/2→6H15/2 (blue) and 4F9/2→6H13/2 (yellow) transitions of Dy3+. The paramagnetic and nontoxic behavior of Dy3+‐doped β‐Ca3(PO4)2 were confirmed from magnetic and MTT tests, respectively. Dy3+ in the host induces a high X‐ray absorption ability for X‐ray computed tomography (CT) and showed efficient contrast T2‐enhancing modality. Thus the proposed system could be used as a promising probe for multimodality with optical imaging, computed tomography and magnetic resonance imaging.

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Section: Discussionsupporting

confidence: 78%

Structural insights in Dy³⁺‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

et al. 2017

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“…No significant diffraction peaks from secondary phases are evident. Because Eu 2+ (1.25 Å) and Dy 3+ (1.03 Å) are of similar ionic radii to Sr 2+ (1.26 Å), their substitutions do not significantly alter the crystal's lattice parameter . The inset image also shows that the synthesized powders have a green phosphorescence as expected.…”

Section: Resultssupporting

confidence: 56%

“…The prototypical SrAl 2 O 4 phosphor has a monoclinic structure with AlO 4 tetrahedra forming a corner‐sharing, three‐dimensional network with open channels in the a‐ and c‐ directions filled with Sr 2+ ions. Eu 2+ and RE 3+ dopants substitute for these Sr 2+ ions owing to similar radii: 1.26 Å for Sr 2+ versus 1.25 Å for Eu 2+ and 1.03 Å for Dy 3+ . Water molecules are believed to penetrate these channels, initially breaking the weaker Sr‐O bonds and eventually hydroxylating the AlO 4 tetrahedra, to decompose the structure …”

Section: Introductionmentioning

confidence: 99%

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

et al. 2020

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The aqueous degradation of Eu2+‐activated and Dy3+‐codoped strontium aluminate (SrAl2O4:Eu2+, Dy3+, SA2‐Green) long afterglow phosphors synthesized from solid‐state reaction and coated with nanoscale metal oxide protective layers (≤12 nm) via atomic layer deposition (ALD) is investigated. Uncoated phosphor powders degrade rapidly upon water immersion and lose their green phosphorescence within 48 hours of water exposure. Postmortem investigations reveal hydration and decomposition of the SrAl2O4 phase. ALD of ~10 nm Al2O3 or ~12 nm TiO2 is found to significantly improve the powder's resistance to aqueous degradation. All ALD‐coated powders show minimal structural and chemical degradation and retain phosphoresence after 48 hours of water immersion. This enhanced durability offers a new pathway for applying long afterglow phosphors to outdoor applications like roadway markings or safety signage and for their incorporation into more eco‐friendly waterborne coatings.

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“…Even for the host where the distance between dopants is relatively long as in the case phosphates where the luminescence decay profiles is strongly exponential for low dopant (0<x≤1) concentrations. At greater concentrations, the decay curves become nonexponential, and the nonexponential change is prominent while the doping increases . This shows that there is more than one relaxation mechanism as a result of concentration quenching.…”

Section: Resultsmentioning

confidence: 93%

Photoluminescence characterization and heat treatment effect on luminescence behavior of BaTa₂O₆:Dy³⁺ phosphor

İlhan

Ekmekçi

Mergen

et al. 2017

Int J Applied Ceramic Tech

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Undoped and Dy3+‐doped barium tantalate phosphors were synthesized by the solid‐state reaction method at 1425°C. Also, 10 mol% Dy3+‐doped BaTa2O6 was sintered between 1150 and 1425°C in order to determine temperature effect on structural and luminescence properties. Afterwards, they were characterized by XRD, SEM‐EDS and photoluminescence (PL) analyses. PL spectra exhibited the excitation peaks between 300 and 440 nm. Two typical emissions were observed at 486.2 nm (blue) and 577.7 nm (yellow) due to the 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions, respectively. Emission intensities increased with increasing doping concentration of Dy3+ up to 10 mol% and then decreased due to the concentration quenching effect. Moreover, depending on the increase in heat treatment temperature, the intensity of emission reached maximum at 1425°C. The calculated CIE chromaticity coordinates of phosphors located in the white light region.

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Synthesis and luminescence characteristics of Dy3+ doped KLa(PO3)4

Cited by 97 publications

References 40 publications

Structural insights in Dy³⁺‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

Structural insights in Dy³⁺‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

Photoluminescence characterization and heat treatment effect on luminescence behavior of BaTa₂O₆:Dy³⁺ phosphor

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Synthesis and luminescence characteristics of Dy3+ doped KLa(PO3)4

Cited by 97 publications

References 40 publications

Structural insights in Dy3+‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

Structural insights in Dy3+‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

Atomic layer deposition (ALD) of nanoscale coatings on SrAl2O4‐based phosphor powders to prevent aqueous degradation

Photoluminescence characterization and heat treatment effect on luminescence behavior of BaTa2O6:Dy3+ phosphor

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Structural insights in Dy³⁺‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

Structural insights in Dy³⁺‐doped β‐Tricalcium phosphate and its multimodal imaging characteristics

Atomic layer deposition (ALD) of nanoscale coatings on SrAl₂O₄‐based phosphor powders to prevent aqueous degradation

Photoluminescence characterization and heat treatment effect on luminescence behavior of BaTa₂O₆:Dy³⁺ phosphor