Laser sintering of persistent luminescent CaAl2O4:Eu2+Dy3+ ceramics

Souza, N.R.S.; Silva, D.C.; Sampaio, D.V.; Rezende, Marcos V. dos S.; Kucera, Courtney; Trofimov, Artem A.; Jacobsohn, L.G.; Ballato, John; Silva, R.S.

doi:10.1016/j.optmat.2016.10.050

Cited by 28 publications

(4 citation statements)

References 33 publications

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“…The afterglow phenomenon possibly involved two centers: the emission center of Eu 2+ and the trap center. The traps included V •• O , V ″ Ca , Eu • Ca , and Dy • Ca , which were produced during the solid-state reaction . Previous studies ,, have reported that the afterglow mechanism of CaAl 2 O 4 :Eu 2+ , Dy 3+ can be explained by the transition of the ground-state 4f 7 electrons of Eu 2+ to excited-state 4f 6 5d 1 under ultraviolet-light irradiation.…”

Section: Luminescence Mechanismmentioning

confidence: 99%

Synthesis of a CaAl₂O₄:Eu²⁺, Dy³⁺ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Shi

Wang

Yang

et al. 2023

Ind. Eng. Chem. Res.

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CaAl 2 O 4 :Eu 2+ , Dy 3+ long-afterglow-luminescence materials were prepared by a high-temperature solid-state reaction assisted by the polymer slurry method (HTSSR-PS). Xray diffraction and scanning electron microscopy were employed to observe the crystal structure and microstructure of CaAl 2 O 4 :Eu 2+ , Dy 3+ phosphors. In addition, density functional theory calculations were utilized to investigate the electronic and crystal structures of CaAl 2 O 4 . Fluorescence spectra and afterglow decay curves characterized luminescence properties. Thermoluminescence curves characterized the optical storage performance. CaAl 2 O 4 :Eu 2+ , Dy 3+ sintered at 1300 °C exhibited the highest crystallinity and the best afterglow performance. Compared to the conventional HTSSR method, the calcination temperature was significantly lower, and the performance was improved. The method was simple, with lower energy consumption, and it was more suitable for large-scale production. In addition, the application of CaAl 2 O 4 :Eu 2+ , Dy 3+ in dynamic anticounterfeiting was demonstrated by exploiting a unique afterglow property.

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Section: Luminescence Mechanismmentioning

confidence: 99%

Synthesis of a CaAl₂O₄:Eu²⁺, Dy³⁺ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Shi

Wang

Yang

et al. 2023

Ind. Eng. Chem. Res.

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“…The emission centers are activation ions whose energy levels can be facilely populated upon optical excitation. A large number of ions, including lanthanide ions (e. g., Ce 3 + , Eu 2 + , Tb 3 + , Nd 3 + , Er 3 + , Pr 3 + , Ho 3 + , Sm 3 + , Tm 3 + , Yb 2 + , Yb 3 + , Dy 3 + ) exhibiting 5d!4 f or 4 f!4 f transition, [28] transition metal ions (e. g., [29] and main group ions (e. g., Bi 3 + , Bi 2 + ) displaying p!s transition, [30] etc. are found to be able to emit persistence luminescence.…”

Section: Main Materials In Nir-ppsmentioning

confidence: 99%

Recent Progress of Near‐Infrared Persistent Phosphors in Bio‐related and Emerging Applications

Tang

et al. 2021

Chemistry An Asian Journal

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Near‐infrared persistent phosphors (NIR‐PPs) are an emerging category of luminescent materials that can continuously emit NIR luminescence with super‐long decay time of minutes, hours, or even days after the excitation ceases. Their unique excitation‐free long‐lasting afterglow, together with the NIR emission, has not only attracted wide research interests in the areas of photochemistry, photophysics, spectroscopy, and materials science, but also stimulated advanced applications in biosensing, bioimaging, biomedicine, and therapy in the past decade. Beyond these bio‐related applications, the active research field triggers a number of novel applications recently. In this review, a brief outline of NIR‐PPs including the luminescence mechanism, main material systems, and how they were applied into various fields was depicted. Particular emphasis was put on the emerging applications outside the field of biology. Future perspectives in this exploration research area were also presented. We hope this review can help researchers grab the latest information in the fast‐growing field of NIR‐PPs.

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“…[2][3][4] Later, doped phosphors were also fabricated, including Y 2 O 3 5) and Y 3 Al 5 O 5 (YAG), [6][7][8][9][10] concomitant to an intense effort focused on aluminate-based persistent phosphors. [11][12][13][14][15] Overall, high densities, typically ⩾95% of the theoretical density were obtained, the achievement of optical transparency remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

“…The first in-depth investigations of dopant homogeneity were carried out on the laser-sintered persistent phosphors SrAl 2 O 4 :Eu,Dy 11) and CaAl 2 O 4 :Eu,Dy. 13) While optical translucency in these materials was achieved, Eu and Dy segregated in the grain boundaries as determined by elemental mapping and line scans obtained by energydispersive X-ray spectroscopy (EDX) measurements. Considerable effort was also directed in the fabrication of rare earth doped YAG, including phosphor and scintillator YAG:Ce.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ceramic scintillators by laser sintering: the case of Lu₃Al₅O₁₂:Pr

Shao

Conner

Souza

et al. 2022

Jpn. J. Appl. Phys.

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The fabrication of ceramic scintillators by laser sintering is briefly reviewed and current limitations discussed. The experimental work focused on the fabrication and characterization of undoped and Pr-doped Lu3Al5O12 (LuAG). X-ray diffraction (XRD) and Raman spectroscopy were used to characterize the structure of the sintered ceramics, with XRD results suggesting the absence of residual thermal stresses. Collectively, Raman results suggested the incorporation of Pr to affect the structure and its dynamics. Broadening of the peaks of the ceramics in relation to those from the single crystal revealed the presence of structural disorder. Scanning electron microscopy revealed intergrain porosity thus explaining the lack of optical transparency. Energy-dispersive X-ray spectroscopy (EDX) measurements showed Pr to be homogeneously distributed. Radioluminescence measurements under X-ray excitation as a function of the temperature were used to investigate intrinsic defects of the host, including anti-sites and F-type defects.

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Laser sintering of persistent luminescent CaAl2O4:Eu2+Dy3+ ceramics

Cited by 28 publications

References 33 publications

Synthesis of a CaAl₂O₄:Eu²⁺, Dy³⁺ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Synthesis of a CaAl₂O₄:Eu²⁺, Dy³⁺ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Recent Progress of Near‐Infrared Persistent Phosphors in Bio‐related and Emerging Applications

Fabrication of ceramic scintillators by laser sintering: the case of Lu₃Al₅O₁₂:Pr

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Laser sintering of persistent luminescent CaAl2O4:Eu2+Dy3+ ceramics

Cited by 28 publications

References 33 publications

Synthesis of a CaAl2O4:Eu2+, Dy3+ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Synthesis of a CaAl2O4:Eu2+, Dy3+ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Recent Progress of Near‐Infrared Persistent Phosphors in Bio‐related and Emerging Applications

Fabrication of ceramic scintillators by laser sintering: the case of Lu3Al5O12:Pr

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Synthesis of a CaAl₂O₄:Eu²⁺, Dy³⁺ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Synthesis of a CaAl₂O₄:Eu²⁺, Dy³⁺ Phosphor by the Polymer Slurry Method and Its Application in Anticounterfeiting

Fabrication of ceramic scintillators by laser sintering: the case of Lu₃Al₅O₁₂:Pr