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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1107Optical Properties of Eu3+-Doped Lithium Tellurite...

Optical Properties of Eu³⁺-Doped Lithium Tellurite Glass

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Abstract:

Improving the optical response of tellurite glasses via controlled doping of rare earth is the key issue in lasing materials. A series of glasses of the form (74.4-x)TeO₂(4.3)Li₂O(21.3)LiCl (x)Eu₂O₃ with 0.0 x 2.0 mol% are synthesized using melt-quenching technique and the influence of Eu₂O₃content on their UV-Vis absorption properties are examined. The absorption spectra reveal two prominent peaks centered at 464 and 533 nm corresponding to ⁷F₀⁵D₂ and ⁷F₁⁵D₁transitions_,respectively. The optical band gap energy for direct and indirect transitions are found to be in the range of 3.294-3.173 eV and 3.067-2.971 eV, respectively. The decrease optical band gap energy with the increase of Eu₂O₃ contents is attributed to the generation of non-bridging oxygen (NBOs). The increase in Urbach energy from 0.226-0.308 eV with the increase of Eu₂O₃ contents signifies the variation in disorder and compactness of the glass network.

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Periodical:

Advanced Materials Research (Volume 1107)

Pages:

432-436

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1107.432

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Online since:

June 2015

Authors:

Siti Aishah Jupri, M.R. Sahar*, Sib Krishna Ghoshal

Keywords:

Absorption, Optical Band Gap, Urbach Energy, UV-VIS

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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