Persistent luminescence properties of SrB X Al 2−X O 4 :Eu,Dy laser-sintered ceramics

Alves, Y.G.S.; Sampaio, D.V.; Souza, N.R.S.; Silva, D.C.; Cunha, T.R.; Meneses, C.T.; Fonseca, E. J. S.; Silva, R.S.

doi:10.1016/j.optmat.2017.05.017

Cited by 18 publications

(5 citation statements)

References 36 publications

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“…The broadband presented in the excitation spectrum is due to the absorption transition of 4f 7 → 4f 6 5d orbital transitions of Eu 2+ ion, however, with a weak sharper peak in its profile with a maximum at 396 nm, which corresponds to the most typical f ‐ f transition of the Eu 3+ ion ( 7 F 0,1 → 5 L 6 ). As demonstrated in other works, some Eu 3+ ions are always present in persistent phosphors based on aluminum spinels doped with Eu 2+ ions, even when reducing preparation conditions are used 15,21,35,36 . It can also be seen that in the emission spectrum, directly excited at 396 nm, there is no trace of emission from the Eu 3+ ion, which only indicates its participation in the excitation process, and that all the observed luminescence originates from Eu 2+ only.…”

Section: Resultssupporting

confidence: 67%

“…As demonstrated in other works, some Eu 3+ ions are always present in persistent phosphors based on aluminum spinels doped with Eu 2+ ions, even when reducing preparation conditions are used. 15,21,35,36 It can also be seen that in the emission spectrum, directly excited at 396 nm, there is no trace of emission from the Eu 3+ ion, which only indicates its participation in the excitation process, and that all the observed luminescence originates from Eu 2+ only. The broadband emission peak located at 560 nm is composed of 4f 6 5d → 4f 7 transition of Eu 2+ .…”

Section: Experimental Methodsmentioning

confidence: 95%

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Fabrication and characterizations of Eu²⁺‐Dy³⁺ co‐doped SrAl₂O₄ ceramics with persistent luminescence

Liu

Zhu

et al. 2023

J Am Ceram Soc.

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(Sr0.97Eu0.01Dy0.02)Al2O4 persistent luminescence (PersL) ceramics were fabricated by solid‐state reactive sintering in vacuum combined with hot isostatic pressing (HIP) using H3BO3 as a sintering additive. The phase composition, microstructure, luminescence properties, trap state, and PersL performance of HIP post‐treated (Sr0.97Eu0.01Dy0.02)Al2O4 PersL ceramics were discussed. For the (Sr0.97Eu0.01Dy0.02)Al2O4 PersL ceramics after HIP post‐treatment, the initial luminescence intensity of the ceramics reached over 6400 mcd/m2 with simulated daylight irradiation of 1000 lx for 5 min, and the persistent emission decay time > 17 h. This is much better than the SrAl2O4:Eu2+,Dy3+ PersL powders and the other luminescent ceramics. In addition, this method is a solid‐state reactive sintering method for synthesizing ceramics, which has the advantages of low cost and simple operation, and is suitable for large‐scale, high‐volume industrial production.

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Section: Resultssupporting

confidence: 67%

Section: Experimental Methodsmentioning

confidence: 95%

Fabrication and characterizations of Eu²⁺‐Dy³⁺ co‐doped SrAl₂O₄ ceramics with persistent luminescence

Liu

Zhu

et al. 2023

J Am Ceram Soc.

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“…Typical examples are transparent ceramics of Cr

^{3 +}

or Ce

^{3 +}

activated garnets [24,25,26], (glass-)ceramics of SrAl

_{2}

_{4}

:Eu

^{2 +}

, Dy

^{3 +}

[27,28,29], near-infrared-emitting ZnGa

_{2}

_{4}

:Cr

^{3 +}

[30,31] and other oxide phosphors [10,32,33]. The luminance or radiance decay curve of a thick ceramic sample will remain above a pre-defined threshold for a much longer time than for a powder sample with a comparable storage capacity and trap depth distribution, making an objective comparison between powder and ceramic samples impossible unless the amount of excited phosphor material is well-controlled.…”

Section: Introductionmentioning

confidence: 99%

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

et al. 2017

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The performance of a persistent phosphor is often determined by comparing luminance decay curves, expressed in cd/m2. However, these photometric units do not enable a straightforward, objective comparison between different phosphors in terms of the total number of emitted photons, as these units are dependent on the emission spectrum of the phosphor. This may lead to incorrect conclusions regarding the storage capacity of the phosphor. An alternative and convenient technique of characterizing the performance of a phosphor was developed on the basis of the absolute storage capacity of phosphors. In this technique, the phosphor is incorporated in a transparent polymer and the measured afterglow is converted into an absolute number of emitted photons, effectively quantifying the amount of energy that can be stored in the material. This method was applied to the benchmark phosphor SrAl2O4:Eu,Dy and to the nano-sized phosphor CaS:Eu. The results indicated that only a fraction of the Eu ions (around 1.6% in the case of SrAl2O4:Eu,Dy) participated in the energy storage process, which is in line with earlier reports based on X-ray absorption spectroscopy. These findings imply that there is still a significant margin for improving the storage capacity of persistent phosphors.

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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%

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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Persistent luminescence properties of SrB X Al 2−X O 4 :Eu,Dy laser-sintered ceramics

Cited by 18 publications

References 36 publications

Fabrication and characterizations of Eu²⁺‐Dy³⁺ co‐doped SrAl₂O₄ ceramics with persistent luminescence

Fabrication and characterizations of Eu²⁺‐Dy³⁺ co‐doped SrAl₂O₄ ceramics with persistent luminescence

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

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

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Persistent luminescence properties of SrB X Al 2−X O 4 :Eu,Dy laser-sintered ceramics

Cited by 18 publications

References 36 publications

Fabrication and characterizations of Eu2+‐Dy3+ co‐doped SrAl2O4 ceramics with persistent luminescence

Fabrication and characterizations of Eu2+‐Dy3+ co‐doped SrAl2O4 ceramics with persistent luminescence

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

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

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Fabrication and characterizations of Eu²⁺‐Dy³⁺ co‐doped SrAl₂O₄ ceramics with persistent luminescence

Fabrication and characterizations of Eu²⁺‐Dy³⁺ co‐doped SrAl₂O₄ ceramics with persistent luminescence

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