Optical properties of Gd<sup>3+</sup>-doped ZnO:SiO<sub>2</sub> thin films

Boruleva, E. A.; Hayrullina, I. A.; Nagovitsyn, I. A.; Хорошилов, А. В.; Шешко, Т. Ф.; Лобанов, А. В.; Chudinova, G. K.

doi:10.1088/1612-202x/ab1bd8

Cited by 2 publications

(2 citation statements)

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“…The band gap energies (Eg) of the samples were determined by the derivative of the transmission coefficient (T) with respect to the energy, dT/dE, taking into account the fact that ZnO is a direct-gap semiconductor. The band gap Eg of undoped and doped La 3+ thin ZnO films is shown in figure 2(A is 3.45 eV, which is in good agreement with the literature [30,31]. In all doped films, the optical band gap increases and amounts to 3.830-3.853 eV.…”

Section: Resultssupporting

confidence: 86%

Effect of DNA on the optical properties of ZnO:SiO₂:La^3⁺ films

Hayrullina¹,

Nagovitsyn²,

Boruleva³

et al. 2020

Laser Phys.

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ZnO–SiO2 composite films doped with La3+ ions (0.1%–5.0% mass.) were obtained using the sol–gel method. The absorption and ultraviolet luminescence spectra of the films, as well as the change in spectral characteristics under the influence of DNA, were studied. Doping of ZnO:SiO2 films with La3+ ions leads to an increase in the transmittance in the UV range (λ = 357 nm) from 4.5% (for undoped films) to 32%–34%, and the transmittance is inversely proportional to the amount of dopant. In all doped films, the optical band gap increases in comparison with undoped films (3.35 eV) and amounts to 3.830–3.853 eV. The application of DNA to the surface weakly affects the value of optical band gap. The maximum of the ultraviolet luminescence (UVL) band in ZnO:SiO2:La3+ films is slightly shifted depending on the amount of dopant and is located at λem = 363–367 nm. An increase in UVL intensity was observed upon doping by a factor of 8.4–9.6 compared to ZnO:SiO2 films. A change in the amount of dopant does not lead to sharp changes in the magnitude of the intensity. Thus, the UVL intensity (λex = 260), compared with films with 0.1% La3+ content, varies by 5%–11%. The effect of small amounts of DNA was studied for films doped with La3+. In the case of ZnO:SiO2:La3+, both extinguishing (up to 12%) and ignition (up to 5%) of UVL were observed. Monotone dependencies (which are desirable for the biosensor sensing element) were obtained for samples with La3+ 0.1 and 1.0% content. SEM images show that the images for zinc oxide are white crystallites of different sizes: from 0.5 µm to conglomerates of crystallites −1 µm. In the presence of DNA, the surface structure changes due to the formation of rhomboid structures, whose sizes vary from 3 µm to 35 µm. It is known that lanthanum ions induce the compaction of DNA with the formation of nanoscale structures.

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Section: Resultssupporting

confidence: 86%

Effect of DNA on the optical properties of ZnO:SiO₂:La^3⁺ films

Hayrullina¹,

Nagovitsyn²,

Boruleva³

et al. 2020

Laser Phys.

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“…Tb 3+ :ZnO:SiO 2 composite films were synthesized by the solgel method [27]. Tb 3+ content varied 0.5; 1; 3; 5% mol.…”

Section: Methodsmentioning

confidence: 99%

Optical properties of ZnO:SiO₂:Tb³⁺films: the effect of DNA

Boruleva¹,

Chudinova²,

Hayrullina³

et al. 2021

Laser Phys. Lett.

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Thin films of zinc oxide and those doped with terbium (at concentrations of 0.1–5.0 mol%) were synthesized on glass substrates using the sol–gel method. The UV–Vis transmission spectra showed that transparency increases from 60% to 86% with an increase of Tb content. All terbium-doped samples exhibit a rise in Eg from 3.37 eV for zinc oxide to 3.827 eV for doped films. The photoluminescence (PL) of zinc oxide doped with terbium in the UV (260 nm) region and the fluorescence of terbium in the visible region (330 nm) were studied. The intensity of green luminescence with an increase in the amount of terbium increases by an average of 6%. The yield of green fluorescence relative to PL also goes up with an increase in the concentration of terbium concentration of terbium from 5% to 7.4%. DNA deposited on the surface of the plate extinguishes PL by an average of 5.5% and has a weak effect (<3%) on terbium fluorescence in the visible region. SEM images without DNA consist of spherical structures—0.5–2.0 μm in diameter, assembled in the form of pentagons. The presence of DNA on the surface is expressed as ‘stars’ of white color of regular and irregular shapes, located on the surface inside these pentagons.

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Optical properties of Gd³⁺-doped ZnO:SiO₂ thin films

Cited by 2 publications

References 35 publications

Effect of DNA on the optical properties of ZnO:SiO₂:La^3⁺ films

Effect of DNA on the optical properties of ZnO:SiO₂:La^3⁺ films

Optical properties of ZnO:SiO₂:Tb³⁺films: the effect of DNA

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Optical properties of Gd3+-doped ZnO:SiO2 thin films

Cited by 2 publications

References 35 publications

Effect of DNA on the optical properties of ZnO:SiO2:La3+ films

Effect of DNA on the optical properties of ZnO:SiO2:La3+ films

Optical properties of ZnO:SiO2:Tb3+films: the effect of DNA

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Optical properties of Gd³⁺-doped ZnO:SiO₂ thin films

Effect of DNA on the optical properties of ZnO:SiO₂:La^3⁺ films

Effect of DNA on the optical properties of ZnO:SiO₂:La^3⁺ films

Optical properties of ZnO:SiO₂:Tb³⁺films: the effect of DNA