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Ionics

, Volume 8, Issue 1–2, pp 73–78 | Cite as

An investigation of the morphological, electrical and optoelectronic properties of short chain Di-ureasils doped with Er3+ ions

  • S. M. Gomes Correia
  • V. de Zea Bermudez
  • R. A. Sá Ferreira
  • L. D. Carlos
  • M. M. Silva
  • S. Barros
  • M. J. Smith
Article

Abstract

Hybrid organic/inorganic xerogels containing Er3+ ions have been prepared by the solgel process. The hybrid framework of these compounds, designated as di-ureasils and represented by U(600), is composed of a siliceous backbone to which polyether chains containing 8.5 oxyethylene repeat units are linked through urea (-NHC(=O)NH-) bridges. The trivalent cations have been incorporated in the matrix as erbium triflate, Er(CF3SO3)3. Compositions with n (where n is the molar ratio of (OCH2CH2) repeat units per Er+ ion) between ∞ and 3 have been studied. The morphology of the materials was characterized by means of X-ray Diffraction and Differential Scanning Calorimetry. Complex Impedance spectroscopy was used to evaluate the levels of conductivity exhibited by the xerogels as a function of temperature. The results obtained clearly demonstrate the amorphous character of the samples analysed. At about 100 °C the most conducting sample is U(600)5Er(CF3SO3)3 (approximately 2×10−5 Scm−1), whereas the U(600)60Er(CF3SO3)3 compound displays the highest conductivity at room temperature (1×10−7 Scm−1). We have shown that concentration effects on the quenching of the 1.53 μm emission intensity (excited at 488 nm) are negligible. We have also shown that the Er3+ ions are active at room temperature.

Keywords

Differential Scanning Calorimetry Emission Intensity Impedance Spectroscopy Short Chain Erbium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© IfI - Institute for Ionics 2002

Authors and Affiliations

  • S. M. Gomes Correia
    • 1
  • V. de Zea Bermudez
    • 1
  • R. A. Sá Ferreira
    • 2
  • L. D. Carlos
    • 2
  • M. M. Silva
    • 3
  • S. Barros
    • 3
  • M. J. Smith
    • 3
  1. 1.Departamento de QuímicaUniversidade de Trás-os-Montes e Alto DouroVila RealPortugal
  2. 2.Departamento de FísicaUniversidade de AveiroAveiroPortugal
  3. 3.Departamento de QuímicaUniversidade do Minho, GualtarBragaPortugal

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