New tellurite glass: Optical properties

El-Mallawany, R.; Abd-Alla, Mubarak Dirar; Ahmed, Ishaq

doi:10.1016/j.matchemphys.2007.11.040

Cited by 193 publications

(59 citation statements)

References 11 publications

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“…3c, reveals the energy band gap of 3.40 eV. This value reflects the sensitivity of the pyrochlore to the ultraviolet light and is comparable to 3.58 eV, reported for hexagonal structured Nd 2 O 3 [15,16] and 3.50 eV for Nd 2 SnO 7 pyrochlore ceramics [5]. The energy band gap of Nd 2 Sn 2 O 7 ceramics determined from the emission and absorption spectra was assigned to the post-transition between the metal perovskite (ABO 3 ) and pyrochlore oxides containing Sn 4+ .…”

Section: Resultssupporting

confidence: 80%

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Physical properties of neodymium tin oxide pyrochlore ceramics

Saleh

Qasrawi

Yumuşak

et al. 2017

Materials Science-Poland

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In this work, physical properties of neodymium tin oxide pyrochlore ceramics prepared by solid state reaction technique are investigated by means of X-ray diffraction, scanning electron microscopy, ultraviolet-visible light (UV-Vis) spectrophotometry and temperature dependent electrical resistivity measurements. The pyrochlore is observed to have a cubic FCC crystal lattice with lattice parameter of 10.578Å. The planes of the cubic cell are best oriented in the [2 2 2] direction. From the X-ray, the UV-Vis spectrophotometry and the electrical resistivity data analysis, the grain size, strain, dislocation density, optical and thermal energy band gaps, localized energy band tail states and resistivity activation energies are determined and discussed. The pyrochlore is observed to have an optical energy band gap of ∼3.40 eV. This value corresponds to 365 nm UV light spectra which nominates the neodymium tin oxide pyrochlore ceramics for the use as UV sensors.

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Section: Resultssupporting

confidence: 80%

“…3d, is found to be 1.39 eV. The existence of the band tails is believed to be due to the random fluctuations of the internal fields associated with the structural disorder in the solid pyrochlore ceramics [16,17]. The values of the energy band tails in Nd 2 O 3 and SnO 2 were reported to be ∼0.20 eV and 1.61 eV, respectively.…”

Section: Resultsmentioning

confidence: 95%

Physical properties of neodymium tin oxide pyrochlore ceramics

Saleh

Qasrawi

Yumuşak

et al. 2017

Materials Science-Poland

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“…1. The obtained Abbe numbers cover a narrow range (16.9 -18.6), confirming a general, inverse relationship between the Abbe number and refractive index in the optical glasses, including other tellurite glasses [25]. The optical absorption spectra of TWPLa:Pr 3+ and TWPLu:Pr 3+ glasses are presented in In the near infrared (NIR), the absorption spectra are characterized by two intense bands corresponding to transitions from the ground state 3 H 4 to excited levels 3 F 2 , 3 , 4 and relatively weak band with a maximum at 9900 cm −1 that is identified as a spin-forbidden electron transition 3 H 4 → 1 G 4 .…”

Section: Resultssupporting

confidence: 65%

“…Differences between particular glasses (< 5%) were not considered significant since ellipsometry is not a direct method to determine the refractive index. A practical measure of the dispersion of light is the Abbe number [25], the values of which for the investigated glasses are shown in the last column of the Table inset within Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic properties of the Pr3+ ion in TeO2-WO3-PbO-La2O3 and TeO2-WO3-PbO-Lu2O3 glasses

Burtan¹,

Sitarz²,

Lisiecki³

et al. 2014

Open Physics

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Abstract:The goal of this work was to investigate the spectroscopic properties of Pr 3+ ions, embedded in two different tellurite glass matrices, TeO 2 -WO 3 -PbO-La 2 O 3 and TeO 2 -WO 3 -PbO-Lu 2 O 3 . The absorption and fluorescence spectra have been recorded and analyzed in terms of the Judd-Ofelt theory along with the luminescence decay of the 3 P 0 and 1 D 2 levels of the Pr 3+ ion. The spectroscopic studies were completed with ellipsometric measurements providing the dispersion relation of the refractive index of the investigated glasses.

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“…Photoluminescence from rare earth doped tellurite glasses are of major interest in the area of optoelectronic device applications like phosphors, display monitors, lasers and amplifiers for communication systems etc. Tellurite glasses exhibit high rare earth ion solubility and low phonon energy environment [1][2][3][4][5][6][7][8][9][10]. Low vibrational frequencies of these glasses allow enough non-radiative transitions from the excited states of dopant ions.…”

Section: Introductionmentioning

confidence: 99%