Structural, optical, photoluminescence properties and Ab initio calculations of new Zn2SiO4/ZnO composite for white light emitting diodes

Essalah, G.; Kadim, Ghizlene; Jabar, A.; Masrour, R.; Ellouze, M.; Guermazi, H.; Guermazi, S.

doi:10.1016/j.ceramint.2020.02.031

Cited by 39 publications

(9 citation statements)

References 83 publications

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“…The existence of the vibrations of SiO 4 and ZnO 4 groups being evidence of the formation of the Zn 2 SiO 4 phase [47][48][49]. The vibrational band observed at 1110 cm −1 ascribed to the Si-O-Si asymmetric stretching vibrations [15,20]. From the Figures 3 and 4, it is found that the increment in the absorption peak intensity at 580 cm −1 which implied the enhancement of ZnO 4 group unit by replacing the Si atoms [48].…”

Section: Fourier Transform Infrared (Ft-ir) Spectroscopymentioning

confidence: 99%

“…Several studies have been reported on the fabrication of ZnO/Zn 2 SiO 4 . The solid-state reaction had been used to fabricate ZnO/Zn 2 SiO 4 [20] with the fabricated sample showed broader visible range emissions compared to Zn 2 SiO 4 and ZnO. Fabrication of ZnO/Zn 2 SiO 4 doped Eu 3+ by sol-gel spin coating technique has also been reported [21].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

et al. 2021

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This research paper proposes the usage of a simple thermal treatment method to synthesis the pure and Eu3+ doped ZnO/Zn2SiO4 based composites which undergo calcination process at different temperatures. The effect of calcination temperatures on the structural, morphological, and optical properties of ZnO/Zn2SiO4 based composites have been studied. The XRD analysis shows the existence of two major phases which are ZnO and Zn2SiO4 crystals and supported by the finding in the FT-IR. The FESEM micrograph further confirms the existence of both ZnO and Zn2SiO4 crystal phases, with progress in the calcination temperature around 700–800 °C which affects the existence of the necking-like shape particle. Absorption humps discovered through UV-Vis spectroscopy revealed that at the higher calcination temperature effects for higher absorption intensity while absorption bands can be seen at below 400 nm with dropping of absorption bands at 370–375 nm. Two types of band gap can be seen from the energy band gap analysis which occurs from ZnO crystal and Zn2SiO4 crystal progress. It is also discovered that for Eu3+ doped ZnO/Zn2SiO4 composites, the Zn2SiO4 crystal (5.11–4.71 eV) has a higher band gap compared to the ZnO crystal (3.271–4.07 eV). While, for the photoluminescence study, excited at 400 nm, the emission spectra of Eu3+ doped ZnO/Zn2SiO4 revealed higher emission intensity compared to pure ZnO/Zn2SiO4 with higher calcination temperature exhibit higher emission intensity at 615 nm with 700 °C being the optimum temperature. The emission spectra also show that the calcination temperature contributed to enhancing the emission intensity.

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Section: Fourier Transform Infrared (Ft-ir) Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

et al. 2021

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“…The presence of a single band at 552 cm −1 (sample W1) and 548 cm −1 (sample W2), as well as bands in the range 600-625 cm −1 , is disputable and not completely defined. Based on willemite IR spectroscopy results, we can assume that these bands could be assigned to symmetric stretching υ 1 (~550 cm −1 ) and asymmetric stretching υ 3 vibrations of ZnO 4 [43,45,52]. According to Griffith's work [53], band ~550 cm −1 can also be related to asymmetric bending vibrations, where υ 4 was at 542 cm −1 [53], but in present work, this band is shifted to the higher wavenumbers.…”

Section: Raman Spectramentioning

confidence: 46%

Luminescence Properties of Tetrahedral Coordinated Mn2+; Genthelvite and Willemite Examples

et al. 2021

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The cause of the split of 4A4E(4G) Mn2+ excited level measured on minerals spectra is discussed. It is our view that ∆E = |4E(4G) − 4A(4G)| should be considered an important spectroscopic parameter. Among the possible reasons for the energy levels splitting taken under consideration, such as the covalent bond theory, the geometric deformation of the coordination polyhedron and the lattice site’s symmetry, the first one was found to be inappropriate. Two studied willemite samples showed that the impurities occur in one of the two available lattice sites differently in both crystals. Moreover, it was revealed that the calculated crystal field Dq parameter can indicate which of the two non-equivalent lattice sites positions in the willemite crystal structure was occupied by Mn2+. The above conclusions were confirmed by X-ray structure measurements. Significant differences were also noted in the Raman spectra of these willemites.

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“…Numerous computational and experimental methods have been implemented to investigate surface defects, surface interactions, binding between organic molecules and the surface, and structural properties of nanomaterials such as gold nanoparticles [ 18 ], CoBr 2 nanolayers [ 19 ], CdO and ZnO [ 20 ] metal oxides and SnO 2 /CdO, ITO and Zn 2 SiO 4 /ZnO nanocomposites [ 21 , 22 , 23 , 24 ]. Due to experimental limitations, it is difficult to analyze the interaction of organic molecules and surfaces at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Surface Modification on Tin-Doped Indium Oxide Nanocomposite Properties

et al. 2022

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This review provides an analysis of the theoretical methods to study the effects of surface modification on structural properties of nanostructured indium tin oxide (ITO), mainly by organic compounds. The computational data are compared with experimental data such as X-ray diffraction (XRD), atomic force microscopy (AFM) and energy-dispersive X-ray spectroscopy (EDS) data with the focus on optoelectronic and electrocatalytic properties of the surface to investigate potential relations of these properties and applications of ITO in fields such as biosensing and electronic device fabrication. Our analysis shows that the change in optoelectronic properties of the surface is mainly due to functionalizing the surface with organic molecules and that the electrocatalytic properties vary as a function of size.

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Structural, optical, photoluminescence properties and Ab initio calculations of new Zn2SiO4/ZnO composite for white light emitting diodes

Cited by 39 publications

References 83 publications

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Luminescence Properties of Tetrahedral Coordinated Mn2+; Genthelvite and Willemite Examples

The Impact of the Surface Modification on Tin-Doped Indium Oxide Nanocomposite Properties

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