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Title: Erbium concentration dependent absorbance in tellurite glass

Abstract

Enhancing the optical absorption cross-section in topically important rare earth doped tellurite glasses is challenging for photonic devices. Controlled synthesis and detailed characterizations of the optical properties of these glasses are important for the optimization. The influence of varying concentration of Er{sup 3+} ions on the absorbance characteristics of lead tellurite glasses synthesized via melt-quenching technique are investigated. The UV-Vis absorption spectra exhibits six prominent peaks centered at 490, 526, 652, 800, 982 and 1520 nm ascribed to the transitions in erbium ion from the ground state to the excited states {sup 4}F{sub 7/2}, {sup 2}H{sub 11/2}, {sup 4}F{sub 9/2}, {sup 4}I{sub 9/2}, {sup 2}H{sub 11/2} and {sup 4}I{sub 13/2}, respectively. The results are analyzed by means of optical band gap E{sub g} and Urbach energy E{sub u}. The values of the energy band gap are found decreased from 2.82 to 2.51 eV and the Urbach energy increased from 0.15 to 0.24 eV with the increase of the Er{sub 2}O{sub 3} concentration from 0 to 1.5 mol%. The excellent absorbance of the prepared tellurite glasses makes them suitable for fabricating solid state lasers.

Authors:
; ; ; ; ;  [1]
  1. Advanced Optical Material Research Group, Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor Bahru, Johor (Malaysia)
Publication Date:
OSTI Identifier:
22307899
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1617; Journal Issue: 1; Conference: ICTAP 2013: 3. international conference on theoretical and applied physics, Malang, East Java (Indonesia), 10-11 Oct 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; CONCENTRATION RATIO; DOPED MATERIALS; ENERGY GAP; ERBIUM; ERBIUM IONS; ERBIUM OXIDES; EV RANGE; EXCITED STATES; GLASS; GROUND STATES; LEAD TELLURIDES; OPTICAL PROPERTIES; SYNTHESIS

Citation Formats

Sazali, E. S., E-mail: mdsupar@utm, Rohani, M. S., E-mail: mdsupar@utm, Sahar, M. R., E-mail: mdsupar@utm, Arifin, R., E-mail: mdsupar@utm, Ghoshal, S. K., E-mail: mdsupar@utm, and Hamzah, K., E-mail: mdsupar@utm. Erbium concentration dependent absorbance in tellurite glass. United States: N. p., 2014. Web. doi:10.1063/1.4897122.
Sazali, E. S., E-mail: mdsupar@utm, Rohani, M. S., E-mail: mdsupar@utm, Sahar, M. R., E-mail: mdsupar@utm, Arifin, R., E-mail: mdsupar@utm, Ghoshal, S. K., E-mail: mdsupar@utm, & Hamzah, K., E-mail: mdsupar@utm. Erbium concentration dependent absorbance in tellurite glass. United States. doi:10.1063/1.4897122.
Sazali, E. S., E-mail: mdsupar@utm, Rohani, M. S., E-mail: mdsupar@utm, Sahar, M. R., E-mail: mdsupar@utm, Arifin, R., E-mail: mdsupar@utm, Ghoshal, S. K., E-mail: mdsupar@utm, and Hamzah, K., E-mail: mdsupar@utm. 2014. "Erbium concentration dependent absorbance in tellurite glass". United States. doi:10.1063/1.4897122.
@article{osti_22307899,
title = {Erbium concentration dependent absorbance in tellurite glass},
author = {Sazali, E. S., E-mail: mdsupar@utm and Rohani, M. S., E-mail: mdsupar@utm and Sahar, M. R., E-mail: mdsupar@utm and Arifin, R., E-mail: mdsupar@utm and Ghoshal, S. K., E-mail: mdsupar@utm and Hamzah, K., E-mail: mdsupar@utm},
abstractNote = {Enhancing the optical absorption cross-section in topically important rare earth doped tellurite glasses is challenging for photonic devices. Controlled synthesis and detailed characterizations of the optical properties of these glasses are important for the optimization. The influence of varying concentration of Er{sup 3+} ions on the absorbance characteristics of lead tellurite glasses synthesized via melt-quenching technique are investigated. The UV-Vis absorption spectra exhibits six prominent peaks centered at 490, 526, 652, 800, 982 and 1520 nm ascribed to the transitions in erbium ion from the ground state to the excited states {sup 4}F{sub 7/2}, {sup 2}H{sub 11/2}, {sup 4}F{sub 9/2}, {sup 4}I{sub 9/2}, {sup 2}H{sub 11/2} and {sup 4}I{sub 13/2}, respectively. The results are analyzed by means of optical band gap E{sub g} and Urbach energy E{sub u}. The values of the energy band gap are found decreased from 2.82 to 2.51 eV and the Urbach energy increased from 0.15 to 0.24 eV with the increase of the Er{sub 2}O{sub 3} concentration from 0 to 1.5 mol%. The excellent absorbance of the prepared tellurite glasses makes them suitable for fabricating solid state lasers.},
doi = {10.1063/1.4897122},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1617,
place = {United States},
year = 2014,
month = 9
}
  • Improving the up-conversion efficiency is the key issue in tellurite glasses. The quantum efficiency, radiative transition rate and lifetimes of excited states are greatly influenced by the optical properties of the host material, ligand field, multiphonon relaxation processes, impurities, temperature and concentration of erbium ions. We develop a comprehensive 4-level model to examine the radiative and nonradiative (NR) decay processes for the green ({sup 4}S{sub 3/2}{yields}{sup 4}I{sub 15/2}) and red ({sup 4}F{sub 9/2}{yields}{sup 4}I{sub 15/2}) emission over a temperature range of (10-340 K) and concentration range of (0.1-4.5 mol.%). Concentration dependent enhancement and thermal quenching of efficiency for up-conversion ismore » investigated using the derived rate equations. These features are attributed to the NR energy transfer processes, trapped impurity effects, and thermal assisted hopping. The unusual nature of temperature and concentration dependent quenching effects for green and red emission is queries for further investigations. It is further suggested that to achieve higher infrared to visible up-converted efficiency in tellurite glasses the NR channels for energy and charge transfer by phonon and impurity mediated process has to be minimized. Our results on pump power dependent emission intensity, quantum efficiency, luminescence intensity, radiative lifetimes, and transition probabilities are in conformity with other experimental findings.« less
  • Chalcogenide glasses have wide applications in optical device technology. But it has some disadvantages like thermal instability. Among them Tellurite glasses exhibits high thermal Stability. Doping of rare earth elements into the Tellurite glasses improve its optical properties. To improve its mechanical properties composites of this Tellurite glasses with polymer are prepared. Bulk samples of Er{sub 2}O{sub 3} doped TeO{sub 2}‐WO{sub 3}‐La{sub 2}O{sub 3} Tellurite glasses are prepared from high purity oxide mixtures, melting in an alumina crucible in air atmosphere. Composites of this Tellurite glasses with polymer are prepared by powder mixing method and the thin films of thesemore » composites are prepared using polymer press. Variations in band gap of these composites are studied from the UV/Vis/NIR absorption.« less
  • A series of [(70TeO{sub 2}−(30−x)ZnO−xPbO){sub 0.99}−(Er{sub 2}O{sub 3}){sub 0.01}; where x = 5, 10, 15 and 20] tellurite glasses, were prepared using the melt quenching technique. Crucial emission bandwidth of erbium at 1.5 μm has been derived and found to be the same for all the glasses, irrespective of PbO content. This identical bandwidth in all tellurite glasses is attributed to the presence of erbium in tellurium rich disordered environments. This result has been complemented through XANES spectra and the obtained invariant first shell of 6.5 oxygen atoms, confirm the unchanged environment in these glasses for all PbO content.
  • Optical characteristics of new generation of tellurite glasses having high stability against crystallization have been studied. As the initial reagents for the glasses synthesis on the base of tellurium oxide (TeO{sub 2}) there were used such oxides as WO{sub 3}, MoO{sub 3}, La{sub 2}O{sub 3}, Li{sub 2}CO{sub 3}, ZnO—Bi{sub 2}O{sub 2}CO{sub 3} and active components such as high purity Er{sub 2}O{sub 3}, Yb{sub 2}O{sub 3}, ErF{sub 3} and YbF{sub 3}. Intensities of luminescence at 1.53 µm of the erbium ions were determined after excitation at 975 nm. Experimental data obtained have shown the possibility to use the studied glasses dopedmore » by Er{sup 3+} and Yb{sup 3+} as active elements for fiber and integrated optics. - Graphical abstract: In contrast to the case of ZBLAN glass the TeO{sub 2}–WO{sub 3} (Er{sup 3+}) glass has bright intensity of luminescence at 1.53 µm for erbium ions that should be caused by excitation at 975 nm. Experimental data obtained have shown the possibility to use the studied glasses doped by Er{sup 3+} and Yb{sup 3+} as active elements for fiber and integrated optics. Display Omitted - Highlights: • We examined changes in growth of luminescence in doubly-doped tellurite glasses. • We found that luminescence grows in two orders by using Er{sup 3+} and Yb{sup 3+} at 1.53 μm. • We see possibility to use those glasses as active elements for integrated optics.« less
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