Nano-composite Phospho-silicate co-doped with Ho3+ and Yb3+ ions for new up-down-shifting applications

Shaker, Zainab; El-Shaarawy, M.G.; Shash, N.M.; Khoder, H.; Battisha, I. K.; Salem, Mohamed

doi:10.21608/ejchem.2021.78927.3861

Cited by 3 publications

(4 citation statements)

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“…The peak at 460 cm −1 is attributed to the bending modes of Si-O-Si perpendicular to its own plane [27] and that of O-P-O chains [24,28]. This is a consequence of the overlapping bending vibrations of silica and phosphate linkages by the local crystal field effects in silica phosphate glass systems [28].…”

Section: Ftir Analysismentioning

confidence: 97%

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Gracie

Geetha²,

Battisha³

2023

J. Phys. D: Appl. Phys.

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Silica phosphate glasses strengthened with calcium oxide modifier and doped with different concentrations (0%, 0.5%, 1%, 1.5 mol%) of praseodymium (Pr3+) were synthesized by sol-gel method. The absence of sharp peaks in the x-ray diffraction (XRD) spectra confirms non-crystallinity of the glasses. Higher doping indicates increasing optical band gaps due to Burstein Moss shift, which also reflects on structural disorders at the absorption tails as validated by Urbach’s rule. The density increases with a subsequent decrease in oxygen packing density, proving the mechanical and chemical stability of the glasses. The composite glasses are multifunctional with marked absorption at 280 nm predicting its purpose as UV shielding films. Luminescence corresponding to the intra 4f transition, 〖1_D〗_2→〖1_G〗_4 in the IR region, with high transmission and low reflection losses suggests the use of the synthesized glass material for S-band telecommunications, while the radiative process involving 〖3_P〗_0→〖3_F〗_2 yields a predominant red laser source. Commission International de l’Eclairage (CIE) color coordinates observe warmer red emission corresponding to Correlated Colour Temperature (CCT) of 3200 K. The composite silica phosphate glass systems evidence the effective role of Pr3+ for photonic applications.

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Section: Ftir Analysismentioning

confidence: 97%

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Gracie

Geetha²,

Battisha³

2023

J. Phys. D: Appl. Phys.

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“…The X-ray diffraction (XRD) using monochromatic CuK α1 radiation of wavelength 1.54056Å from a fixed source operated at 45 kV and 9 mA. The crystallite size (G) was calculated from the Scherrer's equation [19] ; G = Kλ / D cosθ (1) where K (= 0.89) is the Scherer constant, λ is the wavelength, D is the full width (in radians) of the peak at half maximum (FWHM) intensity and θ is the diffracted angle.…”

Section: Characterizationmentioning

confidence: 99%

“…A porous matrix provides, enough nucleation sites for nanoparticle formation and an effective way to avoid their aggregation [7] . Silica gels are the most suitable net -work for this application due to their chemical inertness, large accessible surface area, high porosity, transparency, low thermal expansion coefficient, exceptional mechanical, electrical, optical and magnetic properties [8,9,16,19] . Cobalt oxide nanoparticles embedded in a silica matrix by adopting different preparation methods such as sol-gel [17] , hydrothermal, grafting, chemical vapor deposition and direct solution impregnation methods [2] .…”

Section: Introductionmentioning

confidence: 99%

Silica gel doped with cobalt oxide prepared by sol-gel technique; improving dielectric charge storage

Hamid¹,

Battisha

Shahin

2022

JAP

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The structural, morphology and magnetic properties of Cobalt oxide embedded in silica gel with 10 mol. %, in monolith form, sintered at different temperature ranging from 60 up to 1300ºC, respectively recorded as (SC(60-1300) were prepared by a modified sol gel technique. The sintering temperature effect on the crystallization, surface morphology and magnetic behaviors of the prepared samples will be study, Phase identification by using surface morphology and X-ray diffraction will be study by using Transmission electron microscope (TEM) and Field emission scanning electron microscope imaging (FESEM). The nano-scale presence and the formation of the α-cristobalyte tetragonal phase of silica gel as well as the doped samples with cobalt oxide crystallinity enhancement were detected using the mentioned techniques. FTIR spectra were being study. The saturation magnetization (Ms), remnant magnetization (Mr) and coercive force (Hc), was founded to be equl to 0.183,0.031 emu/g and 46.7Oe respectively. The A. C. conductivity increased by increasing the temperature .Therefore, by increasing the sintering temperature of the silica gel network doped withCo3O4are applicant for several electronic and industrial devices with improved dielectric charge storage capacity and strength.

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“…In fact, with respect to other technologies which are employed to develop photonic materials, sol-gel processing exhibits several advantages in terms of rare earth solubility, composition, design, tailoring of optical properties as well as fabrication of films, waveguides, and photonic crystals [18]. In particular, rare-earth-doped glasses, prepared by the sol-gel route, are used in a large number of optical applications, because of the multiple absorptions and emission bands available using the various rare-earth elements, and are becoming one of the cheapest and most versatile methods for the fabrication of integrated optics components [2,19]. Glasses doped with rare earth ions are of great significance because these glasses have found many applications in devices such as solid-state lasers, upconverters, and optical fibers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Ho3+ and Ho3+: Yb3+ embedded silica–titania nanocomposites: structural and optical properties, Conference paper

Conference¹

2022

Egypt. J. Chem.

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Ho 3+ : Yb 3+ ions doped highly transparent SiO2-TiO2 nano-composite were successfully fabricated in the forms of monolith and thin films. the preparations were carried out via a modified sol-gel method at different annealing temperatures ranging from 500 o C up to 1000 o C for 3h. The structural and optical properties were determined by XRD, FESEM, 3D laser Raman and FTIR spectroscopy. The thickness of the thin film sample doped with 0.4 mol % of Ho 3+ ions and co-doped with 0.5mol % of Yb 3+ was measured 1.3 m using the cross-section Field emission scanning electron microscopy (FESEM) technique. These results suggest that the Ho 3+ : Yb 3+ silica-titania are promising candidates for photonic devices.

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Nano-composite Phospho-silicate co-doped with Ho3+ and Yb3+ ions for new up-down-shifting applications

Cited by 3 publications

References 0 publications

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Silica gel doped with cobalt oxide prepared by sol-gel technique; improving dielectric charge storage

Synthesis and characterization of Ho3+ and Ho3+: Yb3+ embedded silica–titania nanocomposites: structural and optical properties, Conference paper

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