Analysis of Nd3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr3ZnAl2O7 nanophosphor

Mhlongo, M.R.; Koao, L.F.; Motaung, T.E.; Kroon, R.E.; Motloung, S.V.

doi:10.1016/j.rinp.2019.02.004

Cited by 10 publications

(4 citation statements)

References 34 publications

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“…Moreover, the weak excitation bands observed in the excitation spectrum in the range 295-400 nm correspond to electron transitions of Nd 3+ ions from 6 H15/2 → 4 M17/2 (295 nm) [ [10,11]. In the emission spectrum due to 4 I9/2→ 4 G15/2 [12,13] and 4 I9/2→ 4 G5/2, 2 G7/2 transitions of Nd 3+ ions intense emission bands were observed at 476 nm and 585 nm, respectively [12,13]. Moreover, due to 4 F9/2 → 6 Hj (j = 11/2, 9/2) transitions of Nd 3+ ions low-intensity emission bands observed in the range from 665 to 760 nm [10].…”

Section: Resultsmentioning

confidence: 97%

THE LUMINESCENCE AND THERMOLUMINESCENCE STUDIES OF Nd3+ DOPED Sr2SiO4

Yeşilkaynak¹,

Demirdöğen²,

Kafadar³

et al. 2021

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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Sr2SiO4:%3Nd 3+ was synthesized and its structural characterization was made via XRD technique. The results indicated that Sr2SiO4:%3Nd 3+ had Pmma (62) space group (PDF: 00-039-1256) in the orthorhombic crystal system. Luminescence and thermoluminescence (TL) properties of Sr2SiO4:%3Nd 3 was investigated in detail. Computerized glow curve deconvolution methods was used for to determine the kinetic properties of Sr2SiO4:%3Nd 3+ . The TL results showed that Sr2SiO4:Nd 3+ consisted of seven TL glow peaks.

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Section: Resultsmentioning

confidence: 97%

THE LUMINESCENCE AND THERMOLUMINESCENCE STUDIES OF Nd3+ DOPED Sr2SiO4

Yeşilkaynak¹,

Demirdöğen²,

Kafadar³

et al. 2021

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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“…The PL spectra show a strong peak centered at 525 nm for both GQDs and Co-GQDs with an excitation wavelength of 800 nm. For Nd-GQDs, there is a strong peak at 500 nm and a shoulder centered at 530 and 600 nm that can be attributed to the electronic transition from 4 G 7/2 + 2 K 13/2 and 2 G 7/2 + 4 G 5/2 to 4 I 9/2 respectively 98 . As the figure shows an increase in the intensity of PL spectra is recorded for Co-GQDs and the absolute quantum efficiency (QY) for Co-GQDs, and Nd-GQDs were determined to be respectively 41% and 100% more than Graphene QDs.…”

Section: Resultsmentioning

confidence: 98%

High-efficiency upconversion process in cobalt and neodymium doped graphene QDs for biomedical applications

Zarghami

Dolatyari

Mirtagioğlu

et al. 2023

Sci Rep

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Multiphoton absorbing upconversion nanoparticles are emerging as bioimaging materials but are limited by the low quantum yield of their visible fluorescence. This article contains colloids of graphene quantum dots (GQDs), Neodymium, and Cobalt doped Graphene Quantum dots (Co-GQDs and Nd-GQDs) surrounded by carboxylic acids are synthesized which especially are suitable for bio applications; in this way, carboxylic acid groups exchanged by Amoxicillin as an antibiotic with bactericidal activity. The XRD diffraction method, TEM microscope, UV–Vis, and photoluminescence spectroscopies characterize the synthesized materials. The synthesized Quantum dots (QDs) exhibit upconversion properties and their emission is centered at 480 nm, but a red shift was observed with the increase of the excitation wavelength. In the emission spectra of synthesized QDs that can be related to the defect levels introduced by passivation of the QDs in the structure, the results show that with the interaction of the surface QDs with more carboxylic groups, the redshift is not observed. As the results indicate an increase in the intensity of upconversion emission is recorded for Co-GQDs and Nd-GQDs. The absolute quantum efficiency (QY) for Co-GQDs and Nd-GQDs were determined to be 41% and 100% more than GQDs respectively. DFT calculations indicate a strong bond between graphene and cobalt and Neodymium atoms. In doped materials, there are trap levels between the band gap of the GQDs which are responsible for increasing the intensity of the upconversion phenomenon.

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“…In addition, the XRD patterns show that the (110) and (101) diffraction peaks observed at approximately 29 • and 30 • shifted to lower angles as the concentration of Nd 3+ ions increased. The XRD peak shift is due to the replacement of Y 3+ ions with Nd 3+ ions, which are comparatively larger than Y 3+ ions [22]. Figure S3 shows EDS map images and EDS spectrum obtained for the NaYF 4 :Nd (30%),Yb (10%) core DSNPs.…”

Section: Resultsmentioning

confidence: 99%

Intense Near-Infrared Light-Emitting NaYF4:Nd,Yb-Based Nanophosphors for Luminescent Solar Concentrators

et al. 2023

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In this study, we synthesized NaYF4-based downshifting nanophosphors (DSNPs), and fabricated DSNP-polydimethylsiloxane (PDMS) composites. Nd3+ ions were doped into the core and shell to increase absorbance at 800 nm. Yb3+ ions were co-doped into the core to achieve intense near-infrared (NIR) luminescence. To further enhance the NIR luminescence, NaYF4:Nd,Yb/NaYF4:Nd/NaYF4 core/shell/shell (C/S/S) DSNPs were synthesized. The C/S/S DSNPs showed a 3.0-fold enhanced NIR emission at 978 nm compared with core DSNPs under 800 nm NIR light. The synthesized C/S/S DSNPs showed high thermal stability and photostability against the irradiation with ultraviolet light and NIR light. Moreover, for application as luminescent solar concentrators (LSCs), C/S/S DSNPs were incorporated into the PDMS polymer, and the DSNP-PDMS composite containing 0.25 wt% of C/S/S DSNP was fabricated. The DSNP-PDMS composite showed high transparency (average transmittance = 79.4% for the visible spectral range of 380–750 nm). This result demonstrates the applicability of the DSNP-PDMS composite in transparent photovoltaic modules.

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Analysis of Nd3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr3ZnAl2O7 nanophosphor

Cited by 10 publications

References 34 publications

THE LUMINESCENCE AND THERMOLUMINESCENCE STUDIES OF Nd3+ DOPED Sr2SiO4

THE LUMINESCENCE AND THERMOLUMINESCENCE STUDIES OF Nd3+ DOPED Sr2SiO4

High-efficiency upconversion process in cobalt and neodymium doped graphene QDs for biomedical applications

Intense Near-Infrared Light-Emitting NaYF4:Nd,Yb-Based Nanophosphors for Luminescent Solar Concentrators

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