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Photoluminescence of sol–gel synthesized transparent amorphous semiconducting La- and Sm-codoped organo-silicate hybrid material

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Abstract

Transparent amorphous La- and Sm-codoped organo-silicate hybrid material has been synthesized, in the form of bulk samples, via an alkoxide sol–gel route. Thermal behavior of the synthesized glass was investigated using differential thermal analysis (DTA) coupled with thermogravimetry (TGA). From the DTA–TGA analyses, it can be concluded that the organic component constitutes ≈8 weight percentage (wt%) of the as prepared La–Sm-codoped hybrid organo-silica glass; and this glass contains about 29.3 wt% structural water in the form of hydroxyl groups. Fourier transform infrared (FTIR) and ultraviolet–visible-near infrared (UV–Vis-NIR) spectroscopic analyses were used for structural characterization of the prepared hybrid sol–gel glass. FTIR spectroscopy reveals functional groups, specifically –CH2, C–O–C, Si–O–C and Si–O–Si bonds, which indicate the formation of covalent bonds between the organic and inorganic components in the produced polyethylene glycol (PEG)-silica hybrid network. UV–Vis-NIR spectrum exhibits well defined absorption bands of Sm3+ ions due to 4f–4f transitions. The evolution of Sm3+ photoluminescence in the La–Sm-codoped hybrid organo-silica glass was investigated at room temperature. A strong reddish-orange emission, attributed to the 4G5/2 → 6H7/2 electronic transition in 4f5 configuration of Sm3+ ions, was observed. Semiconducting characteristics have been also reported and interpreted.

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Authors and Affiliations

  1. Glass Research Department, National Research Centre (NRC), El-Behoos Str., Dokki, Cairo, 12622, Egypt

    S. M. Abo-Naf, M. A. Marzouk & R. L. Elwan

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  1. S. M. Abo-Naf
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  2. M. A. Marzouk
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  3. R. L. Elwan
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Correspondence to S. M. Abo-Naf.

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Abo-Naf, S.M., Marzouk, M.A. & Elwan, R.L. Photoluminescence of sol–gel synthesized transparent amorphous semiconducting La- and Sm-codoped organo-silicate hybrid material. J Mater Sci: Mater Electron 23, 2293–2300 (2012). https://doi.org/10.1007/s10854-012-0823-5

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