Synthesis, characterization and luminescence properties of long afterglow Phosphor Ba4Al14O25:Eu,Dy

Emen, Fatih Mehmet; Külcü, Nevzat; Yazici, A. Necmeddin

doi:10.5155/eurjchem.1.1.28-32.8

Cited by 18 publications

(5 citation statements)

References 24 publications

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“…is is because the crystallization process can induce defects, which trap electrons and holes [13]. Similar results were obtained by Emen et al [13] and they have argued that, in a barium aluminate host, the excitation and emission peaks could be a result of native defects such as cation and anion vacancies in the host crystal. Moreover, Ziyauddin et al [39] found that oxygen vacancies and three different sites of calcium vacancies are present in calcium aluminate (host).…”

Section: Plsupporting

confidence: 54%

“…To this end, the europium ions can be introduced into the CaAl 2 O 4 , CaAl 4 O 7 , or BaAl 2 O 4 lattice in its trivalent (Eu 3+ ) or divalent (Eu 2+ ) state or both of them at the same time [9]. Eu 2+ /Eu 3+ -doped CaAl 2 O 4 , CaAl 4 O 7 , BaAl 2 O 4 , or Ba x Ca 1-x Al 2 O 4 has been prepared using different techniques such as combustion method [10][11][12], solid state reaction [4,13,14], microwave [14], Pechini method [15], and sol-gel synthesis methods [7,16]. Sol-gel synthesis has some advantages over other synthesis techniques, for example, operating under relatively low temperature, easy control of stoichiometry, and high level of product homogeneity, and it is a cheap synthesis method [15].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Eu3+ Concentration on the BaAl2O4/CaAl4O7: x% Eu3+ (0 ≤ x ≤ 5.5) Mixed-Phase Nanophosphors Synthesized Using Citrate Sol-Gel Method

Mahman

Sithole

2021

Advances in Materials Science and Engineering

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A series of undoped mixed-phase BaAl2O4/CaAl4O7 (hereafter called BC) and doped BC: x% Eu3+ (0 < x ≤ 5.5) nanophosphors were successfully prepared by the citrate sol-gel technique. Their structure, morphology, and optical properties were studied in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy. XRD and SEM showed that all the BC:x% Eu3+ samples consisted of the crystalline structure of the mixed phases of both the BaAl2O4 and CaAl4O7 materials. The structure resembles more that of the BaAl2O4 than the CaAl4O7 phase. The TEM results suggest that the crystallite sizes are in the nanometer scale with rod-like particles. PL results showed multiple emission peaks located at 436, 590, 616, 656, and 703 nm, which were assigned to the intrinsic defects within the BC matrix, 5D0 ⟶ 7F1, 5D0 ⟶ 7F2, 5D0 ⟶ 7F3, and 5D0 ⟶ 7F4 transitions of Eu3+, respectively. The decay curves evidently showed that the nanophosphors have persistent luminescence. The Commission Internationale de l’Eclairage (CIE) analysis revealed that doping has tuned the emission colour from blue to orange-red. The results indicate that the Eu3+-doped samples can potentially be used in the orange/red-emitting phosphors.

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Section: Plsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Effect of Eu3+ Concentration on the BaAl2O4/CaAl4O7: x% Eu3+ (0 ≤ x ≤ 5.5) Mixed-Phase Nanophosphors Synthesized Using Citrate Sol-Gel Method

Mahman

Sithole

2021

Advances in Materials Science and Engineering

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“…A complete description of the thermoluminescent characteristics of a TL material is required to obtain these parameters. There are various methods for evaluating the trapping parameters from TL glow curves . For example, when one of the glow peaks is highly isolated from the others, the experimental method such as the peak shape method is a suitable method to determine these by the glow peak.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the photoluminescence and long afterglow properties of Sr₂MgSi₂O₇:Eu²⁺ phosphor by Dy³⁺ co‐doping

et al. 2015

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Sr2MgSi2O7:Eu(2+) and Sr2MgSi2O7:Eu(2+),Dy(3+) long afterglow phosphors were synthesized under a weak reducing atmosphere by the traditional high temperature solid state reaction method. The synthesized phosphors were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and photo-, thermo- and mechanoluminescence spectroscopic techniques. The phase structure of the sintered phosphor was an akermanite type structure, which belongs to tetragonal crystallography. The thermoluminescence properties of these phosphors were investigated and compared. Under ultraviolet light excitation, the emission spectra of both prepared phosphors were composed of a broad emission band peaking at 470 nm. When the Sr2MgSi2O7:Eu(2+) phosphor was co-doped with Dy(3+), the photoluminescence (PL), afterglow and mechanoluminescence (ML) intensity were strongly enhanced. The decay graph indicated that both the sintered phosphors contained fast decay and slow decay processes. The ML intensities of Sr2MgSi2O7:Eu(2+) and Sr2MgSi2O7:Eu(2+),Dy(3+) phosphors were increased proportionally with increasing impact velocity, a finding that suggests that these phosphors could be used as sensors to detect the stress of an object.

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“…followed by the recombination of electrons and holes in the luminescence centers and give rise to luminescence. In the practical system the electron traps and the hole traps may not be both equally important in terms of their contribution to the light emission [30].…”

Section: Thermoluminescence (Pl)mentioning

confidence: 99%

Luminescence studies of dysprosium doped strontium aluminate white light emitting phosphor by combustion route

Sahu

Bisen

Brahme

et al. 2015

J Mater Sci: Mater Electron

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In the present investigation dysprosium doped strontium aluminate phosphor was prepared by combustion synthesis method. The crystal structure of the prepared phosphor was consistent with standard monoclinic phase with a space group P2 1 . According to the TEM analysis, the particle size was found to be in the nanometer range. The trap parameters which are mainly activation energy (E), frequency factor (s) and order of the kinetics (b) were evaluated by using the peak shape method. Under the ultraviolet (365 nm) excitation, photoluminescence (PL) spectra showed characteristic emission bands at 480 (blue), 573 (yellow) and 670 nm (red) due to 4

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Synthesis, characterization and luminescence properties of long afterglow Phosphor Ba4Al14O25:Eu,Dy

Cited by 18 publications

References 24 publications

Effect of Eu3+ Concentration on the BaAl2O4/CaAl4O7: x% Eu3+ (0 ≤ x ≤ 5.5) Mixed-Phase Nanophosphors Synthesized Using Citrate Sol-Gel Method

Effect of Eu3+ Concentration on the BaAl2O4/CaAl4O7: x% Eu3+ (0 ≤ x ≤ 5.5) Mixed-Phase Nanophosphors Synthesized Using Citrate Sol-Gel Method

Enhancement of the photoluminescence and long afterglow properties of Sr₂MgSi₂O₇:Eu²⁺ phosphor by Dy³⁺ co‐doping

Luminescence studies of dysprosium doped strontium aluminate white light emitting phosphor by combustion route

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Synthesis, characterization and luminescence properties of long afterglow Phosphor Ba4Al14O25:Eu,Dy

Cited by 18 publications

References 24 publications

Effect of Eu3+ Concentration on the BaAl2O4/CaAl4O7: x% Eu3+ (0 ≤ x ≤ 5.5) Mixed-Phase Nanophosphors Synthesized Using Citrate Sol-Gel Method

Effect of Eu3+ Concentration on the BaAl2O4/CaAl4O7: x% Eu3+ (0 ≤ x ≤ 5.5) Mixed-Phase Nanophosphors Synthesized Using Citrate Sol-Gel Method

Enhancement of the photoluminescence and long afterglow properties of Sr2MgSi2O7:Eu2+ phosphor by Dy3+ co‐doping

Luminescence studies of dysprosium doped strontium aluminate white light emitting phosphor by combustion route

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Enhancement of the photoluminescence and long afterglow properties of Sr₂MgSi₂O₇:Eu²⁺ phosphor by Dy³⁺ co‐doping