Effect of annealing at different time intervals on the structure, morphology and luminescent properties of MgAl 2 O 4 :0.3% In 3+ nanophosphor prepared by citrate sol-gel method

Melato, L.T.; Motaung, T.E.; Ntwaeaborwa, O.M.; Motloung, S.V.

doi:10.1016/j.optmat.2017.02.034

Cited by 21 publications

(16 citation statements)

References 25 publications

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“…Therefore, the results suggest that the AT have the influence on the structural and morphological changes, which considerably influence the PL emission intensity. Similar study [41] in MgAl 2 O 4 :0.3% In 3+ has also confirmed that the AT significantly influences the emission intensity.…”

Section: Photoluminescent (Pl) Analysissupporting

confidence: 79%

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Motloung

Kumari

Koao

et al. 2018

Materials Today Communications

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ZnAl 2 O 4 nano-powders have been successfully prepared via citrate sol-gel technique. All powder samples were annealed at 600 o C for 1, 2, and 3 h. Thermogravimetric analysis (TGA) confirmed that the minimum annealing temperature of crystallization is ~ 400 °C. Fourier Transform Infrared (FTIR) results showed a series of absorption peaks in the range of 810-4000 cm-1. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) results showed that the prepared nano-crystals consists of the mixture of both cubic (ZnAl 2 O 4) and hexagonal (ZnO) structures. Ultra violet visible (UV-vis) spectroscopy revealed that the annealing time (AT) influences the band gap of the prepared phosphor materials. When the 2 samples were excited at 275 nm, two emission peaks at 428 nm (violet) and 561 nm (green-yellow) were observed and they are attributed to the defects levels within the ZnO and ZnAl 2 O 4 band gaps. The Commission Internationale de l'Elcairage (CIE) colour coordinates confirmed that all the prepared samples exhibit the violet emission and varying the AT does not influence the emission colour.

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Section: Photoluminescent (Pl) Analysissupporting

confidence: 79%

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Motloung

Kumari

Koao

et al. 2018

Materials Today Communications

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“…The 382, 401, 550 and 690 nm emission originates from the defect centres (DCs) within the host material. 4,7 The emission intensity as a function of excitation wavelength is shown in Figure 8(b), which reaveled the Gaussian behaviour. The optimum emission intensity that the host must be excited at is 275 nm.…”

Section: Resultsmentioning

confidence: 61%

“…The absorption band located at around 382 nm is ascribed to the defects absorption within the host material. 7 For the doped samples, the small absorption band located at 465 nm is assigned to the electric dipole transition ( 7 F 0 → 5 D 2 ) within the Eu 3+ ion. 5,15 When comparing the host and Mg 1.5 Al 2 O 4.5 : x % Eu 3+ samples, it can be clearly seen that the F centre (275 nm) absorption peak is more pronounced when x > 0.1% Eu 3+ .…”

Section: Resultsmentioning

confidence: 97%

Section: Uv-vismentioning

confidence: 99%

“…The photoluminescence (PL) showed the presence of the broad band in the ultraviolet visible (UV) region which was assigned to the charge transfer (CT) transition between O 2− and Eu 3+ ions, which is an electron transfer from O 2− (2p 6 ) orbital to the empty orbital of 4f 6 of Eu 3+ . Melato et al 7 have reported the effects of annealing at different intervals on the MgAl 2 O 4 :0.3% In 3+ system. The PL results showed that the photoexcitation of the F (277 nm) and F + (342 nm) centres caused the radiative relaxation channel with the emission peaks located at 388 and 560 nm, which were, respectively, attributed to defect centres located at different levels.…”

Section: Introductionmentioning

confidence: 99%

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The effects of varying the Eu³⁺ concentration on the structural and optical properties of Mg_1.5Al₂O_4.5:x% Eu³⁺ (0 ≤ x ≤ 2) nanophosphors prepared by sol–gel method

Maphiri

Dejene

Motaung

et al. 2018

Nanomaterials and Nanotechnology

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Mg 1.5 Al 2 O 4.5 :x% Eu 3þ (0 x 2) nanopowders were successfully synthesized via sol-gel method. The X-ray diffraction (XRD) spectrum revealed that the Mg 1.5 Al 2 O 4.5 :x% Eu 3þ matches the single phase of face-centred cubic MgAl 2 O 4. The estimated average crystallite sizes calculated using the XRD spectra were found to be in the order of 4 nm. The estimated crystal size was confirmed by the high-resolution transmission electron microscopy. The energy dispersive X-ray spectroscopy confirmed the presence of all expected elementary composition (Mg, Al, O and Eu). The field emission gun scanning electron microscope showed that varying the Eu 3þ concentration influence the morphology of the prepared nanophosphor. The photoluminescence results showed that the host emits the violet colour at around 382 nm, which was attributed to the defects within the band gap (E g) of host material. The Eu 3þ-doped samples showed the emission at around 560, 580, 593, 618, 655 and 704 nm which are, respectively, attributed to the 5

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Synthesis, thermoluminescence characterizations, and photon attenuation parameters of MgAl₂O₄ structure doped with different ions

Qaid,

Asemi,

Ahmed

et al. 2024

Luminescence

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In this work, different ion co‐doped Mg1‐xAl2O4 nanophosphors, coded as M5Cr‐5LaA, M5Cr‐5CuA, M0.07Si‐0.03CeA, and M0.05Ti‐0.05LaA, where 5Cr‐5La, 5Cr‐5Cu, 0.07Si‐0.03Ce, and 0.05Ti‐0.05La representing the added ions (mol%), were prepared using the sol–gel method. Phase structure, transmission electron microscope (TEM) images, and element feasibility were checked using X‐ray diffraction, TEM analysis, and energy dispersive X‐ray (EDX) spectroscopy. Their thermoluminescence (TL) response was checked using a 5 Gy γ‐test dose. The M0.05Ti‐0.05LaA sample was found to be best for the TL response with an ~1.1 times response compared with that of the MTS‐700 commercial detector. A wide range of dose–responses for the M0.05Ti‐0.05LaA sample was found up to a 20 Gy γ‐dose with the lowest detectable dose of ⁓23 μGy. Photon attenuation parameter results were Zeff ⁓10, which mean that the M0.05Ti‐0.05LaA sample could be considered as a near tissue equivalent material. Due to this study, the M0.05Ti‐0.05LaA sample can be considered as a promising detector for application in personal and medical dosimetric monitoring.

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Effect of annealing at different time intervals on the structure, morphology and luminescent properties of MgAl 2 O 4 :0.3% In 3+ nanophosphor prepared by citrate sol-gel method

Cited by 21 publications

References 25 publications

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

The effects of varying the Eu³⁺ concentration on the structural and optical properties of Mg_1.5Al₂O_4.5:x% Eu³⁺ (0 ≤ x ≤ 2) nanophosphors prepared by sol–gel method

Synthesis, thermoluminescence characterizations, and photon attenuation parameters of MgAl₂O₄ structure doped with different ions

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Effect of annealing at different time intervals on the structure, morphology and luminescent properties of MgAl 2 O 4 :0.3% In 3+ nanophosphor prepared by citrate sol-gel method

Cited by 21 publications

References 25 publications

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

The effects of varying the Eu3+ concentration on the structural and optical properties of Mg1.5Al2O4.5:x% Eu3+ (0 ≤ x ≤ 2) nanophosphors prepared by sol–gel method

Synthesis, thermoluminescence characterizations, and photon attenuation parameters of MgAl2O4 structure doped with different ions

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Product

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The effects of varying the Eu³⁺ concentration on the structural and optical properties of Mg_1.5Al₂O_4.5:x% Eu³⁺ (0 ≤ x ≤ 2) nanophosphors prepared by sol–gel method

Synthesis, thermoluminescence characterizations, and photon attenuation parameters of MgAl₂O₄ structure doped with different ions